Gout

TOPLINE:

Gout patients who take colchicine at the start of urate-lowering therapy have a lower risk for cardiovascular events than those who do not receive prophylaxis.

METHODOLOGY:

• Retrospective cohort study of 99,800 patients (mean age, 62.8 years; 74.4% men; 85.1% White) newly diagnosed with gout between January 1997 and March 2021 who initiated urate-lowering therapy.
• Gout flare prophylaxis, defined as a colchicine prescription for 21 days or more, was prescribed to 16,028 patients for a mean duration of 47.3 days at a mean daily dose of 0.97 mg.
• Patients who received colchicine prophylaxis and 83,772 patients who did not receive prophylaxis were followed for a mean of 175.5 and 176.9 days, respectively, in the intention-to-treat analysis.
• The primary outcome was the occurrence of the first cardiovascular event (fatal or nonfatal myocardial infarction or stroke) within 180 days of initiation of urate-lowering therapy.

TAKEAWAY:

• The risk for cardiovascular events was significantly lower with colchicine prophylaxis than without it (weighted hazard ratio [HR], 0.82; 95% CI, 0.69-0.94).
• The risk for a first-ever cardiovascular event was significantly lower with colchicine prophylaxis than without it (adjusted HR, 0.80; 95% CI, 0.62-0.97).
• The findings were similar regardless of analytical approach, and the intention-to-treat analysis did not show an increased risk for diarrhea with colchicine.

IN PRACTICE:

“The findings support consideration for the use of colchicine in people with gout and cardiovascular diseases,” the authors wrote. 

“The observed beneficial effect of colchicine concerns a huge group of patients worldwide. In addition, it is conceivable that, if a cardiovascular risk reduction is indeed confirmed, a strong argument arises to recommend the prescription of a course of colchicine to all [flaring] patients with gout, independently of their preference for urate-lowering therapy in general or urate-lowering therapy with or without colchicine prophylaxis more specifically,” experts wrote in a linked commentary.

SOURCE:

Edoardo Cipolletta, MD, Academic Rheumatology, School of Medicine, Nottingham City Hospital, University of Nottingham, England, led the study, which was published online in The Lancet Rheumatology.

LIMITATIONS: 

Because of the retrospective nature of the data extraction from a prospective database, the study had variations in follow-up and data completeness. Potential surveillance bias could have been introduced because patients with prior cardiovascular events were included in the study, and patients’ adherence to prescribed medications could not be verified.

DISCLOSURES:

This study was funded by the Foundation for Research in Rheumatology. Some authors reported receiving consulting fees, lecturing fees, and travel grants from various pharmaceutical companies and other additional sources.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article appeared on Medscape.com.

TOPLINE:

Gout patients who take colchicine at the start of urate-lowering therapy have a lower risk for cardiovascular events than those who do not receive prophylaxis.

METHODOLOGY:

• Retrospective cohort study of 99,800 patients (mean age, 62.8 years; 74.4% men; 85.1% White) newly diagnosed with gout between January 1997 and March 2021 who initiated urate-lowering therapy.
• Gout flare prophylaxis, defined as a colchicine prescription for 21 days or more, was prescribed to 16,028 patients for a mean duration of 47.3 days at a mean daily dose of 0.97 mg.
• Patients who received colchicine prophylaxis and 83,772 patients who did not receive prophylaxis were followed for a mean of 175.5 and 176.9 days, respectively, in the intention-to-treat analysis.
• The primary outcome was the occurrence of the first cardiovascular event (fatal or nonfatal myocardial infarction or stroke) within 180 days of initiation of urate-lowering therapy.

TAKEAWAY:

• The risk for cardiovascular events was significantly lower with colchicine prophylaxis than without it (weighted hazard ratio [HR], 0.82; 95% CI, 0.69-0.94).
• The risk for a first-ever cardiovascular event was significantly lower with colchicine prophylaxis than without it (adjusted HR, 0.80; 95% CI, 0.62-0.97).
• The findings were similar regardless of analytical approach, and the intention-to-treat analysis did not show an increased risk for diarrhea with colchicine.

IN PRACTICE:

“The findings support consideration for the use of colchicine in people with gout and cardiovascular diseases,” the authors wrote. 

“The observed beneficial effect of colchicine concerns a huge group of patients worldwide. In addition, it is conceivable that, if a cardiovascular risk reduction is indeed confirmed, a strong argument arises to recommend the prescription of a course of colchicine to all [flaring] patients with gout, independently of their preference for urate-lowering therapy in general or urate-lowering therapy with or without colchicine prophylaxis more specifically,” experts wrote in a linked commentary.

SOURCE:

Edoardo Cipolletta, MD, Academic Rheumatology, School of Medicine, Nottingham City Hospital, University of Nottingham, England, led the study, which was published online in The Lancet Rheumatology.

LIMITATIONS: 

Because of the retrospective nature of the data extraction from a prospective database, the study had variations in follow-up and data completeness. Potential surveillance bias could have been introduced because patients with prior cardiovascular events were included in the study, and patients’ adherence to prescribed medications could not be verified.

DISCLOSURES:

This study was funded by the Foundation for Research in Rheumatology. Some authors reported receiving consulting fees, lecturing fees, and travel grants from various pharmaceutical companies and other additional sources.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article appeared on Medscape.com.

TOPLINE:

Gout patients who take colchicine at the start of urate-lowering therapy have a lower risk for cardiovascular events than those who do not receive prophylaxis.

METHODOLOGY:

• Retrospective cohort study of 99,800 patients (mean age, 62.8 years; 74.4% men; 85.1% White) newly diagnosed with gout between January 1997 and March 2021 who initiated urate-lowering therapy.
• Gout flare prophylaxis, defined as a colchicine prescription for 21 days or more, was prescribed to 16,028 patients for a mean duration of 47.3 days at a mean daily dose of 0.97 mg.
• Patients who received colchicine prophylaxis and 83,772 patients who did not receive prophylaxis were followed for a mean of 175.5 and 176.9 days, respectively, in the intention-to-treat analysis.
• The primary outcome was the occurrence of the first cardiovascular event (fatal or nonfatal myocardial infarction or stroke) within 180 days of initiation of urate-lowering therapy.

TAKEAWAY:

• The risk for cardiovascular events was significantly lower with colchicine prophylaxis than without it (weighted hazard ratio [HR], 0.82; 95% CI, 0.69-0.94).
• The risk for a first-ever cardiovascular event was significantly lower with colchicine prophylaxis than without it (adjusted HR, 0.80; 95% CI, 0.62-0.97).
• The findings were similar regardless of analytical approach, and the intention-to-treat analysis did not show an increased risk for diarrhea with colchicine.

IN PRACTICE:

“The findings support consideration for the use of colchicine in people with gout and cardiovascular diseases,” the authors wrote. 

“The observed beneficial effect of colchicine concerns a huge group of patients worldwide. In addition, it is conceivable that, if a cardiovascular risk reduction is indeed confirmed, a strong argument arises to recommend the prescription of a course of colchicine to all [flaring] patients with gout, independently of their preference for urate-lowering therapy in general or urate-lowering therapy with or without colchicine prophylaxis more specifically,” experts wrote in a linked commentary.

SOURCE:

Edoardo Cipolletta, MD, Academic Rheumatology, School of Medicine, Nottingham City Hospital, University of Nottingham, England, led the study, which was published online in The Lancet Rheumatology.

LIMITATIONS: 

Because of the retrospective nature of the data extraction from a prospective database, the study had variations in follow-up and data completeness. Potential surveillance bias could have been introduced because patients with prior cardiovascular events were included in the study, and patients’ adherence to prescribed medications could not be verified.

DISCLOSURES:

This study was funded by the Foundation for Research in Rheumatology. Some authors reported receiving consulting fees, lecturing fees, and travel grants from various pharmaceutical companies and other additional sources.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article appeared on Medscape.com.

Interleukin-6 receptor (IL-6r) inhibition is a promising approach for the treatment of calcium pyrophosphate deposition disease (CPPD), although no prospective studies have been conducted to date. Nevertheless, a retrospective analysis of patients treated with the IL-6r inhibitor tocilizumab, presented at American College of Rheumatology (ACR) 2024 Annual Meeting, showed improved CPPD control in more than two thirds of patients who had failed or could not tolerate usual therapies.

Both the monosodium urate (MSU) crystals associated with gout and CPP crystals induce inflammation dependent on IL-1 beta, but IL-1 beta inhibitors have been investigated more as treatments for gout than for CPPD, and they are recommended by both ACR and European Alliance of Associations for Rheumatology (EULAR) guidelines for patients with gout who have flares despite efforts to treat with colchicine, nonsteroidal anti-inflammatory drugs, and corticosteroids. However, IL-1 beta inhibitors are sometimes used off label in CPPD.

There are similarities among the various crystal types that induce arthritis, typically producing similar clinical features of acute arthritis and severe pain and local inflammation and tending to self-resolve within days to weeks. Those shared clinical features suggest common inflammatory mechanisms, likely stemming from the innate immune system, said Augustin Latourte, MD, PhD, of Lariboisière Hospital, Paris, France, during a talk on the topic at the annual research symposium of the Gout Hyperuricemia and Crystal-Associated Disease Network (G-CAN).

CPPD management is generally derived from strategies developed for gout, but there is little evidence supporting IL-1 beta inhibitors outside of case reports, he said. One clinical trial published in 2020 showed efficacy of the IL-1 inhibitor anakinra, but the study was halted due to low patient recruitment, resulting in a small study population. In that study, “anakinra seems to have a faster onset of action than prednisone and could be useful in specific situations regarding acute CPPD arthritis. But it’s not relevant for chronic CPPD arthritis when you have persistent polyarthritis requiring chronic treatment. Anakinra requires daily injections and may not be appropriate in this situation,” he said.

IL-6r inhibition has been studied since IL-6 was first discovered in 1989 as a mediator of inflammatory responses in gout and CPPD, when it was shown that both CPP and MSU crystals can stimulate its production. In monocytes, IL-6 is expressed at higher levels than IL-1 beta in response to both CPP and MSU crystals. IL-6 production in monocytes in response to crystals is dependent on IL-1, and IL-1 inhibition reduces IL-6 production. “So the hypothesis is that IL-1 beta is the first event, and the production of IL-6 and the amplification of crystal inflammation occurs downstream before the self-limitation of the crystal-induced arthritis. IL-6 may be a very important event in the onset of crystal-induced inflammation,” Latourte said.

 

Building on Mechanistic Insights to Test Off-Label Use of Tocilizumab

Inspired by this insight, Latourte’s group tested tocilizumab in a 28-year-old man with a familial ANKH mutation who had not responded to anakinra and other conventional treatments. The patient experienced a reduction in flare intensity in the first month after the initial treatment and no flares after the second tocilizumab infusion. The group went on to test tocilizumab in 10 additional patients with CPPD (median age, 62.5 years), including 6 with idiopathic CPPD, 3 with Gitelman syndrome, and 1 with ANKH mutation. The clinical presentation included four with recurrent acute arthritis and six with chronic polyarthritis, and all had x-ray–proven disease, with a median visual analog scale (VAS) of 60 mm out of 100 mm. Tocilizumab was administered intravenously or subcutaneously. At 3 months, there was a median improvement of 30 mm in the VAS. Treatment efficacy continued for a median follow-up of 5.5 months at the time of publication, and the researchers have noted ongoing efficacy out to 50 months for some patients.

Tocilizumab has gone on to more frequent use in Europe as a second- or third-line therapy for CPPD, which led Latourte and his colleagues to perform the retrospective analysis that they presented at the ACR meeting. It included 55 patients who received tocilizumab for chronic inflammatory CPPD at two university hospitals. Participants had a median age of 72 years, and 67.3% were women. The patient group included 39 with chronic CPPD, 14 with recurrent acute CPPD (who experienced 0-4 attacks per month), and two patients with mixed CPPD. All participants had been treated with colchicine, and 20 had been treated also with prednisone and 24 with anakinra. Patients had stopped anakinra because it was either ineffective (n = 13) or poorly tolerated (n = 11).

Tocilizumab was administered intravenously in 46 patients and subcutaneously in nine patients for a median duration of 16.5 months (range, 0.8-76.4 months). The median VAS for pain (0- to 100-mm scale) dropped from 60 mm at baseline to 40 mm at 3 months and 30 mm at 6 months. There were 21 adverse events, including 8 cytopenias, 6 transaminase elevations, 4 infections (two severe), and 3 injection-site reactions. After a median of 7.8 months, 26 patients discontinued tocilizumab because of lack of efficacy in 15 patients and intolerance in 11. Among those who continued on tocilizumab, the median length of treatment was 26.0 months (range, 3-76.5 months).

 

Comments on the Study

The study population had some unusual characteristics, according to G-CAN President Robert Terkeltaub, MD, who was asked to comment on the study. “Almost half the patients had received anakinra and then, basically, they failed. In about half of the people who got anakinra, it didn’t work, and in the other half, it wasn’t well tolerated. It’s just rather odd. I find anakinra reasonably well tolerated by people, but we’re dealing with an older population of patients, and the subcutaneous administration of anakinra sometimes can give you injection site reactions, but people started off with a pain level that was close to what we register as severe pain, and the pain level decreased,” he said.

Treatment decisions can be difficult in patients with chronic or acute recurrent CPPD, said Terkeltaub, professor of medicine at the University of California, San Diego. “What’s the lesser evil? Putting people on chronic prednisone is really hard on patients or using a biologic that’s more of an immunologic scalpel here, and more selective, and trying to get people through a long course of therapy. If you have chronic arthritis, it took a while for it to get chronic, and it generally doesn’t go away overnight.”

Terkeltaub also pointed out the gastrointestinal side effects of IL-6r inhibitors, which can include diverticulitis, but there are also concerns over infections and lipid and liver abnormalities. Subcutaneously injected tocilizumab also has a longer half-life than something like anakinra.

Beyond the retrospective nature of the study and the limits it imposes on conclusions that can be drawn, Terkeltaub noted a lack of data on the number of “inflamed joints [in each patient] and what the functioning of the patients was.”

Still, the findings are encouraging. “What I can glean from this study is that the first biologic drug might be an IL-6 inhibitor, but you really need prospective, controlled, blinded clinical trials to know, and it’s hard. It’s just hard to do those trials” because patients tend to be of advanced age, Terkeltaub said.

Latourte said a randomized controlled trial of tocilizumab vs placebo, called TociCCAre, is planned to begin in France in 2025.

Latourte has financial relationships with Fresenius Kabi, Roche Chugai, AbbVie, Arsylab, Celltrion, Janssen, Nordic, Pfizer, UCB, Amgen, Biogen, Galapagos, and Eli Lilly. Terkeltaub had no relevant financial disclosures.

A version of this article appeared on Medscape.com.

Interleukin-6 receptor (IL-6r) inhibition is a promising approach for the treatment of calcium pyrophosphate deposition disease (CPPD), although no prospective studies have been conducted to date. Nevertheless, a retrospective analysis of patients treated with the IL-6r inhibitor tocilizumab, presented at American College of Rheumatology (ACR) 2024 Annual Meeting, showed improved CPPD control in more than two thirds of patients who had failed or could not tolerate usual therapies.

Both the monosodium urate (MSU) crystals associated with gout and CPP crystals induce inflammation dependent on IL-1 beta, but IL-1 beta inhibitors have been investigated more as treatments for gout than for CPPD, and they are recommended by both ACR and European Alliance of Associations for Rheumatology (EULAR) guidelines for patients with gout who have flares despite efforts to treat with colchicine, nonsteroidal anti-inflammatory drugs, and corticosteroids. However, IL-1 beta inhibitors are sometimes used off label in CPPD.

There are similarities among the various crystal types that induce arthritis, typically producing similar clinical features of acute arthritis and severe pain and local inflammation and tending to self-resolve within days to weeks. Those shared clinical features suggest common inflammatory mechanisms, likely stemming from the innate immune system, said Augustin Latourte, MD, PhD, of Lariboisière Hospital, Paris, France, during a talk on the topic at the annual research symposium of the Gout Hyperuricemia and Crystal-Associated Disease Network (G-CAN).

CPPD management is generally derived from strategies developed for gout, but there is little evidence supporting IL-1 beta inhibitors outside of case reports, he said. One clinical trial published in 2020 showed efficacy of the IL-1 inhibitor anakinra, but the study was halted due to low patient recruitment, resulting in a small study population. In that study, “anakinra seems to have a faster onset of action than prednisone and could be useful in specific situations regarding acute CPPD arthritis. But it’s not relevant for chronic CPPD arthritis when you have persistent polyarthritis requiring chronic treatment. Anakinra requires daily injections and may not be appropriate in this situation,” he said.

IL-6r inhibition has been studied since IL-6 was first discovered in 1989 as a mediator of inflammatory responses in gout and CPPD, when it was shown that both CPP and MSU crystals can stimulate its production. In monocytes, IL-6 is expressed at higher levels than IL-1 beta in response to both CPP and MSU crystals. IL-6 production in monocytes in response to crystals is dependent on IL-1, and IL-1 inhibition reduces IL-6 production. “So the hypothesis is that IL-1 beta is the first event, and the production of IL-6 and the amplification of crystal inflammation occurs downstream before the self-limitation of the crystal-induced arthritis. IL-6 may be a very important event in the onset of crystal-induced inflammation,” Latourte said.

 

Building on Mechanistic Insights to Test Off-Label Use of Tocilizumab

Inspired by this insight, Latourte’s group tested tocilizumab in a 28-year-old man with a familial ANKH mutation who had not responded to anakinra and other conventional treatments. The patient experienced a reduction in flare intensity in the first month after the initial treatment and no flares after the second tocilizumab infusion. The group went on to test tocilizumab in 10 additional patients with CPPD (median age, 62.5 years), including 6 with idiopathic CPPD, 3 with Gitelman syndrome, and 1 with ANKH mutation. The clinical presentation included four with recurrent acute arthritis and six with chronic polyarthritis, and all had x-ray–proven disease, with a median visual analog scale (VAS) of 60 mm out of 100 mm. Tocilizumab was administered intravenously or subcutaneously. At 3 months, there was a median improvement of 30 mm in the VAS. Treatment efficacy continued for a median follow-up of 5.5 months at the time of publication, and the researchers have noted ongoing efficacy out to 50 months for some patients.

Tocilizumab has gone on to more frequent use in Europe as a second- or third-line therapy for CPPD, which led Latourte and his colleagues to perform the retrospective analysis that they presented at the ACR meeting. It included 55 patients who received tocilizumab for chronic inflammatory CPPD at two university hospitals. Participants had a median age of 72 years, and 67.3% were women. The patient group included 39 with chronic CPPD, 14 with recurrent acute CPPD (who experienced 0-4 attacks per month), and two patients with mixed CPPD. All participants had been treated with colchicine, and 20 had been treated also with prednisone and 24 with anakinra. Patients had stopped anakinra because it was either ineffective (n = 13) or poorly tolerated (n = 11).

Tocilizumab was administered intravenously in 46 patients and subcutaneously in nine patients for a median duration of 16.5 months (range, 0.8-76.4 months). The median VAS for pain (0- to 100-mm scale) dropped from 60 mm at baseline to 40 mm at 3 months and 30 mm at 6 months. There were 21 adverse events, including 8 cytopenias, 6 transaminase elevations, 4 infections (two severe), and 3 injection-site reactions. After a median of 7.8 months, 26 patients discontinued tocilizumab because of lack of efficacy in 15 patients and intolerance in 11. Among those who continued on tocilizumab, the median length of treatment was 26.0 months (range, 3-76.5 months).

 

Comments on the Study

The study population had some unusual characteristics, according to G-CAN President Robert Terkeltaub, MD, who was asked to comment on the study. “Almost half the patients had received anakinra and then, basically, they failed. In about half of the people who got anakinra, it didn’t work, and in the other half, it wasn’t well tolerated. It’s just rather odd. I find anakinra reasonably well tolerated by people, but we’re dealing with an older population of patients, and the subcutaneous administration of anakinra sometimes can give you injection site reactions, but people started off with a pain level that was close to what we register as severe pain, and the pain level decreased,” he said.

Treatment decisions can be difficult in patients with chronic or acute recurrent CPPD, said Terkeltaub, professor of medicine at the University of California, San Diego. “What’s the lesser evil? Putting people on chronic prednisone is really hard on patients or using a biologic that’s more of an immunologic scalpel here, and more selective, and trying to get people through a long course of therapy. If you have chronic arthritis, it took a while for it to get chronic, and it generally doesn’t go away overnight.”

Terkeltaub also pointed out the gastrointestinal side effects of IL-6r inhibitors, which can include diverticulitis, but there are also concerns over infections and lipid and liver abnormalities. Subcutaneously injected tocilizumab also has a longer half-life than something like anakinra.

Beyond the retrospective nature of the study and the limits it imposes on conclusions that can be drawn, Terkeltaub noted a lack of data on the number of “inflamed joints [in each patient] and what the functioning of the patients was.”

Still, the findings are encouraging. “What I can glean from this study is that the first biologic drug might be an IL-6 inhibitor, but you really need prospective, controlled, blinded clinical trials to know, and it’s hard. It’s just hard to do those trials” because patients tend to be of advanced age, Terkeltaub said.

Latourte said a randomized controlled trial of tocilizumab vs placebo, called TociCCAre, is planned to begin in France in 2025.

Latourte has financial relationships with Fresenius Kabi, Roche Chugai, AbbVie, Arsylab, Celltrion, Janssen, Nordic, Pfizer, UCB, Amgen, Biogen, Galapagos, and Eli Lilly. Terkeltaub had no relevant financial disclosures.

A version of this article appeared on Medscape.com.

Interleukin-6 receptor (IL-6r) inhibition is a promising approach for the treatment of calcium pyrophosphate deposition disease (CPPD), although no prospective studies have been conducted to date. Nevertheless, a retrospective analysis of patients treated with the IL-6r inhibitor tocilizumab, presented at American College of Rheumatology (ACR) 2024 Annual Meeting, showed improved CPPD control in more than two thirds of patients who had failed or could not tolerate usual therapies.

Both the monosodium urate (MSU) crystals associated with gout and CPP crystals induce inflammation dependent on IL-1 beta, but IL-1 beta inhibitors have been investigated more as treatments for gout than for CPPD, and they are recommended by both ACR and European Alliance of Associations for Rheumatology (EULAR) guidelines for patients with gout who have flares despite efforts to treat with colchicine, nonsteroidal anti-inflammatory drugs, and corticosteroids. However, IL-1 beta inhibitors are sometimes used off label in CPPD.

There are similarities among the various crystal types that induce arthritis, typically producing similar clinical features of acute arthritis and severe pain and local inflammation and tending to self-resolve within days to weeks. Those shared clinical features suggest common inflammatory mechanisms, likely stemming from the innate immune system, said Augustin Latourte, MD, PhD, of Lariboisière Hospital, Paris, France, during a talk on the topic at the annual research symposium of the Gout Hyperuricemia and Crystal-Associated Disease Network (G-CAN).

CPPD management is generally derived from strategies developed for gout, but there is little evidence supporting IL-1 beta inhibitors outside of case reports, he said. One clinical trial published in 2020 showed efficacy of the IL-1 inhibitor anakinra, but the study was halted due to low patient recruitment, resulting in a small study population. In that study, “anakinra seems to have a faster onset of action than prednisone and could be useful in specific situations regarding acute CPPD arthritis. But it’s not relevant for chronic CPPD arthritis when you have persistent polyarthritis requiring chronic treatment. Anakinra requires daily injections and may not be appropriate in this situation,” he said.

IL-6r inhibition has been studied since IL-6 was first discovered in 1989 as a mediator of inflammatory responses in gout and CPPD, when it was shown that both CPP and MSU crystals can stimulate its production. In monocytes, IL-6 is expressed at higher levels than IL-1 beta in response to both CPP and MSU crystals. IL-6 production in monocytes in response to crystals is dependent on IL-1, and IL-1 inhibition reduces IL-6 production. “So the hypothesis is that IL-1 beta is the first event, and the production of IL-6 and the amplification of crystal inflammation occurs downstream before the self-limitation of the crystal-induced arthritis. IL-6 may be a very important event in the onset of crystal-induced inflammation,” Latourte said.

 

Building on Mechanistic Insights to Test Off-Label Use of Tocilizumab

Inspired by this insight, Latourte’s group tested tocilizumab in a 28-year-old man with a familial ANKH mutation who had not responded to anakinra and other conventional treatments. The patient experienced a reduction in flare intensity in the first month after the initial treatment and no flares after the second tocilizumab infusion. The group went on to test tocilizumab in 10 additional patients with CPPD (median age, 62.5 years), including 6 with idiopathic CPPD, 3 with Gitelman syndrome, and 1 with ANKH mutation. The clinical presentation included four with recurrent acute arthritis and six with chronic polyarthritis, and all had x-ray–proven disease, with a median visual analog scale (VAS) of 60 mm out of 100 mm. Tocilizumab was administered intravenously or subcutaneously. At 3 months, there was a median improvement of 30 mm in the VAS. Treatment efficacy continued for a median follow-up of 5.5 months at the time of publication, and the researchers have noted ongoing efficacy out to 50 months for some patients.

Tocilizumab has gone on to more frequent use in Europe as a second- or third-line therapy for CPPD, which led Latourte and his colleagues to perform the retrospective analysis that they presented at the ACR meeting. It included 55 patients who received tocilizumab for chronic inflammatory CPPD at two university hospitals. Participants had a median age of 72 years, and 67.3% were women. The patient group included 39 with chronic CPPD, 14 with recurrent acute CPPD (who experienced 0-4 attacks per month), and two patients with mixed CPPD. All participants had been treated with colchicine, and 20 had been treated also with prednisone and 24 with anakinra. Patients had stopped anakinra because it was either ineffective (n = 13) or poorly tolerated (n = 11).

Tocilizumab was administered intravenously in 46 patients and subcutaneously in nine patients for a median duration of 16.5 months (range, 0.8-76.4 months). The median VAS for pain (0- to 100-mm scale) dropped from 60 mm at baseline to 40 mm at 3 months and 30 mm at 6 months. There were 21 adverse events, including 8 cytopenias, 6 transaminase elevations, 4 infections (two severe), and 3 injection-site reactions. After a median of 7.8 months, 26 patients discontinued tocilizumab because of lack of efficacy in 15 patients and intolerance in 11. Among those who continued on tocilizumab, the median length of treatment was 26.0 months (range, 3-76.5 months).

 

Comments on the Study

The study population had some unusual characteristics, according to G-CAN President Robert Terkeltaub, MD, who was asked to comment on the study. “Almost half the patients had received anakinra and then, basically, they failed. In about half of the people who got anakinra, it didn’t work, and in the other half, it wasn’t well tolerated. It’s just rather odd. I find anakinra reasonably well tolerated by people, but we’re dealing with an older population of patients, and the subcutaneous administration of anakinra sometimes can give you injection site reactions, but people started off with a pain level that was close to what we register as severe pain, and the pain level decreased,” he said.

Treatment decisions can be difficult in patients with chronic or acute recurrent CPPD, said Terkeltaub, professor of medicine at the University of California, San Diego. “What’s the lesser evil? Putting people on chronic prednisone is really hard on patients or using a biologic that’s more of an immunologic scalpel here, and more selective, and trying to get people through a long course of therapy. If you have chronic arthritis, it took a while for it to get chronic, and it generally doesn’t go away overnight.”

Terkeltaub also pointed out the gastrointestinal side effects of IL-6r inhibitors, which can include diverticulitis, but there are also concerns over infections and lipid and liver abnormalities. Subcutaneously injected tocilizumab also has a longer half-life than something like anakinra.

Beyond the retrospective nature of the study and the limits it imposes on conclusions that can be drawn, Terkeltaub noted a lack of data on the number of “inflamed joints [in each patient] and what the functioning of the patients was.”

Still, the findings are encouraging. “What I can glean from this study is that the first biologic drug might be an IL-6 inhibitor, but you really need prospective, controlled, blinded clinical trials to know, and it’s hard. It’s just hard to do those trials” because patients tend to be of advanced age, Terkeltaub said.

Latourte said a randomized controlled trial of tocilizumab vs placebo, called TociCCAre, is planned to begin in France in 2025.

Latourte has financial relationships with Fresenius Kabi, Roche Chugai, AbbVie, Arsylab, Celltrion, Janssen, Nordic, Pfizer, UCB, Amgen, Biogen, Galapagos, and Eli Lilly. Terkeltaub had no relevant financial disclosures.

A version of this article appeared on Medscape.com.

TOPLINE:

Achieving serum urate to below 6 mg/dL with urate-lowering therapy (ULT) in patients with gout and chronic kidney disease (CKD) stage III is not linked to an increased risk for severe or end-stage kidney disease.

METHODOLOGY:

• Researchers emulated analyses of a hypothetical target trial using a cloning, censoring, and weighting approach to evaluate the association between achieving target serum urate level with ULT and the progression of CKD in patients with gout and CKD stage III.
• They included 14,972 patients (mean age, 73.1 years; 37.7% women) from a general practice database who had a mean baseline serum urate level of 8.9 mg/dL and initiated ULTs such as allopurinol or febuxostat.
• Participants were divided into two groups: Those who achieved a target serum urate level < 6 mg/dL and those who did not within 1 year after the initiation of ULT; the mean follow-up duration was a little more than 3 years in both groups.
• The primary outcome was the occurrence of severe or end-stage kidney disease over 5 years of initiating ULT, defined by an estimated glomerular filtration rate below 30 mL/min per 1.73 m² on two occasions more than 90 days apart within 1 year, or at least one Read code for CKD stages IV or V, dialysis, or kidney transplant.
• A prespecified noninferiority margin for the hazard ratio was set at 1.2 to compare the outcomes between those who achieved the target serum urate level < 6 mg/dL and those who did not.

TAKEAWAY:

• Among the patients who initiated ULT, 31.8% achieved a target serum urate level < 6 mg/dL within 1 year.
• The 5-year risk for severe or end-stage kidney disease was lower (10.32%) in participants with gout and stage III CKD who achieved the target serum urate level than in those who did not (12.73%).
• The adjusted 5-year risk difference for severe to end-stage kidney disease was not inferior in patients who achieved the target serum urate level vs those who did not (adjusted hazard ratio [aHR], 0.89; 95% CI, 0.80-0.98; P for noninferiority < .001); results were consistent for end-stage kidney disease alone (aHR, 0.67; P for noninferiority = .001).
• Similarly, in participants with gout and CKD stages II-III, the 5-year risks for severe or end-stage kidney disease (aHR, 0.91) and end-stage kidney disease alone (aHR, 0.73) were noninferior in the group that did vs that did not achieve target serum urate levels, with P for noninferiority being < .001 and .003, respectively.

IN PRACTICE:

“Our findings suggest that lowering serum urate levels to < 6 mg/dL is generally well tolerated and may even slow CKD progression in these individuals. Initiatives to optimize the use and adherence to ULT could benefit clinicians and patients,” the authors wrote.

SOURCE:

This study was led by Yilun Wang, MD, PhD, Xiangya Hospital, Central South University, Changsha, China. It was published online in JAMA Internal Medicine.

LIMITATIONS:

Residual confounding may still have been present despite rigorous methods to control it, as is common in observational studies. Participants who achieved target serum urate levels may have received better healthcare, adhered to other treatments more consistently, and used ULT for a longer duration. The findings may have limited generalizability, as participants who did not achieve target serum urate levels prior to initiation were excluded.

DISCLOSURES:

This study was supported by the China National Key Research and Development Plan, the National Natural Science Foundation of China, the Project Program of the National Clinical Research Center for Geriatric Disorders, and other sources. Two authors reported receiving personal fees and/or grants from multiple pharmaceutical companies.

This article was created using several editorial tools, including artificial intelligence, as part of the process. Human editors reviewed this content before publication. A version of this article appeared on Medscape.com.

TOPLINE:

Achieving serum urate to below 6 mg/dL with urate-lowering therapy (ULT) in patients with gout and chronic kidney disease (CKD) stage III is not linked to an increased risk for severe or end-stage kidney disease.

METHODOLOGY:

• Researchers emulated analyses of a hypothetical target trial using a cloning, censoring, and weighting approach to evaluate the association between achieving target serum urate level with ULT and the progression of CKD in patients with gout and CKD stage III.
• They included 14,972 patients (mean age, 73.1 years; 37.7% women) from a general practice database who had a mean baseline serum urate level of 8.9 mg/dL and initiated ULTs such as allopurinol or febuxostat.
• Participants were divided into two groups: Those who achieved a target serum urate level < 6 mg/dL and those who did not within 1 year after the initiation of ULT; the mean follow-up duration was a little more than 3 years in both groups.
• The primary outcome was the occurrence of severe or end-stage kidney disease over 5 years of initiating ULT, defined by an estimated glomerular filtration rate below 30 mL/min per 1.73 m² on two occasions more than 90 days apart within 1 year, or at least one Read code for CKD stages IV or V, dialysis, or kidney transplant.
• A prespecified noninferiority margin for the hazard ratio was set at 1.2 to compare the outcomes between those who achieved the target serum urate level < 6 mg/dL and those who did not.

TAKEAWAY:

• Among the patients who initiated ULT, 31.8% achieved a target serum urate level < 6 mg/dL within 1 year.
• The 5-year risk for severe or end-stage kidney disease was lower (10.32%) in participants with gout and stage III CKD who achieved the target serum urate level than in those who did not (12.73%).
• The adjusted 5-year risk difference for severe to end-stage kidney disease was not inferior in patients who achieved the target serum urate level vs those who did not (adjusted hazard ratio [aHR], 0.89; 95% CI, 0.80-0.98; P for noninferiority < .001); results were consistent for end-stage kidney disease alone (aHR, 0.67; P for noninferiority = .001).
• Similarly, in participants with gout and CKD stages II-III, the 5-year risks for severe or end-stage kidney disease (aHR, 0.91) and end-stage kidney disease alone (aHR, 0.73) were noninferior in the group that did vs that did not achieve target serum urate levels, with P for noninferiority being < .001 and .003, respectively.

IN PRACTICE:

“Our findings suggest that lowering serum urate levels to < 6 mg/dL is generally well tolerated and may even slow CKD progression in these individuals. Initiatives to optimize the use and adherence to ULT could benefit clinicians and patients,” the authors wrote.

SOURCE:

This study was led by Yilun Wang, MD, PhD, Xiangya Hospital, Central South University, Changsha, China. It was published online in JAMA Internal Medicine.

LIMITATIONS:

Residual confounding may still have been present despite rigorous methods to control it, as is common in observational studies. Participants who achieved target serum urate levels may have received better healthcare, adhered to other treatments more consistently, and used ULT for a longer duration. The findings may have limited generalizability, as participants who did not achieve target serum urate levels prior to initiation were excluded.

DISCLOSURES:

This study was supported by the China National Key Research and Development Plan, the National Natural Science Foundation of China, the Project Program of the National Clinical Research Center for Geriatric Disorders, and other sources. Two authors reported receiving personal fees and/or grants from multiple pharmaceutical companies.

This article was created using several editorial tools, including artificial intelligence, as part of the process. Human editors reviewed this content before publication. A version of this article appeared on Medscape.com.

TOPLINE:

Achieving serum urate to below 6 mg/dL with urate-lowering therapy (ULT) in patients with gout and chronic kidney disease (CKD) stage III is not linked to an increased risk for severe or end-stage kidney disease.

METHODOLOGY:

• Researchers emulated analyses of a hypothetical target trial using a cloning, censoring, and weighting approach to evaluate the association between achieving target serum urate level with ULT and the progression of CKD in patients with gout and CKD stage III.
• They included 14,972 patients (mean age, 73.1 years; 37.7% women) from a general practice database who had a mean baseline serum urate level of 8.9 mg/dL and initiated ULTs such as allopurinol or febuxostat.
• Participants were divided into two groups: Those who achieved a target serum urate level < 6 mg/dL and those who did not within 1 year after the initiation of ULT; the mean follow-up duration was a little more than 3 years in both groups.
• The primary outcome was the occurrence of severe or end-stage kidney disease over 5 years of initiating ULT, defined by an estimated glomerular filtration rate below 30 mL/min per 1.73 m² on two occasions more than 90 days apart within 1 year, or at least one Read code for CKD stages IV or V, dialysis, or kidney transplant.
• A prespecified noninferiority margin for the hazard ratio was set at 1.2 to compare the outcomes between those who achieved the target serum urate level < 6 mg/dL and those who did not.

TAKEAWAY:

• Among the patients who initiated ULT, 31.8% achieved a target serum urate level < 6 mg/dL within 1 year.
• The 5-year risk for severe or end-stage kidney disease was lower (10.32%) in participants with gout and stage III CKD who achieved the target serum urate level than in those who did not (12.73%).
• The adjusted 5-year risk difference for severe to end-stage kidney disease was not inferior in patients who achieved the target serum urate level vs those who did not (adjusted hazard ratio [aHR], 0.89; 95% CI, 0.80-0.98; P for noninferiority < .001); results were consistent for end-stage kidney disease alone (aHR, 0.67; P for noninferiority = .001).
• Similarly, in participants with gout and CKD stages II-III, the 5-year risks for severe or end-stage kidney disease (aHR, 0.91) and end-stage kidney disease alone (aHR, 0.73) were noninferior in the group that did vs that did not achieve target serum urate levels, with P for noninferiority being < .001 and .003, respectively.

IN PRACTICE:

“Our findings suggest that lowering serum urate levels to < 6 mg/dL is generally well tolerated and may even slow CKD progression in these individuals. Initiatives to optimize the use and adherence to ULT could benefit clinicians and patients,” the authors wrote.

SOURCE:

This study was led by Yilun Wang, MD, PhD, Xiangya Hospital, Central South University, Changsha, China. It was published online in JAMA Internal Medicine.

LIMITATIONS:

Residual confounding may still have been present despite rigorous methods to control it, as is common in observational studies. Participants who achieved target serum urate levels may have received better healthcare, adhered to other treatments more consistently, and used ULT for a longer duration. The findings may have limited generalizability, as participants who did not achieve target serum urate levels prior to initiation were excluded.

DISCLOSURES:

This study was supported by the China National Key Research and Development Plan, the National Natural Science Foundation of China, the Project Program of the National Clinical Research Center for Geriatric Disorders, and other sources. Two authors reported receiving personal fees and/or grants from multiple pharmaceutical companies.

This article was created using several editorial tools, including artificial intelligence, as part of the process. Human editors reviewed this content before publication. A version of this article appeared on Medscape.com.

A new diagnostic test can accurately distinguish osteoarthritis (OA) from inflammatory arthritis using two synovial fluid biomarkers, according to research published in the Journal of Orthopaedic Research on December 18, 2024.

However, experts question whether such a test would be useful.

“The need would seem to be fairly limited, mostly those with single joint involvement and a lack of other systemic features to specify a diagnosis, which is not that common, at least in rheumatology, where there are usually features in the history and physical that can clarify the diagnosis,” said Amanda E. Nelson, MD, MSCR, professor of medicine in the Division of Rheumatology, Allergy, and Immunology at the University of North Carolina at Chapel Hill. She was not involved with the research.

The test uses an algorithm that incorporates concentrations of cartilage oligomeric matrix protein (COMP) and interleukin 8 (IL-8) in synovial fluid. The researchers hypothesized that a ratio of the two biomarkers could distinguish between primary OA and other inflammatory arthritic diagnoses.

“Primary OA is unlikely when either COMP concentration or COMP/IL‐8 ratio in the synovial fluid is low since these conditions indicate either lack of cartilage degradation or presence of high inflammation,” wrote Daniel Keter and coauthors at CD Diagnostics, Claymont, Delaware, and CD Laboratories, Towson, Maryland. “In contrast, a high COMP concentration result in combination with high COMP/IL‐8 ratio would be suggestive of low inflammation in the setting of cartilage deterioration, which is indicative of primary OA.”

In patients with OA, synovial fluid can be difficult to aspirate in sufficient amounts for testing, Nelson said.

“If synovial fluid is present and able to be aspirated, it is unclear if this test has any benefit over a simple, standard cell count and crystal assessment, which can also distinguish between osteoarthritis and more inflammatory arthritides,” she said.

 

Differentiating OA

To test this potential diagnostic algorithm, researchers obtained 171 knee synovial fluid samples from approved clinical remnant sample sources and a biovendor. All samples were annotated with an existing arthritic diagnosis, including 54 with primary OA, 57 with rheumatoid arthritis (RA), 30 with crystal arthritis (CA), and 30 with native septic arthritis (NSA).

Researchers assigned a CA diagnosis based on the presence of monosodium urate or calcium pyrophosphate dehydrate crystals in the synovial fluid, and NSA was determined via the Synovasure Alpha Defensin test. OA was confirmed via radiograph as Kellgren‐Lawrence grades 2‐4 with no other arthritic diagnoses. RA samples were purchased via a biovendor, and researchers were not provided with diagnosis‐confirming data.

All samples were randomized and blinded before testing, and researchers used enzyme-linked immunosorbent assay tests for both COMP and IL-8 biomarkers.

Of the 54 OA samples, 47 tested positive for OA using the COMP + COMP/IL-8 ratio algorithm. Of the 117 samples with inflammatory arthritis, 13 tested positive for OA. Overall, the diagnostic algorithm demonstrated a clinical sensitivity of 87.0% and specificity of 88.9%. The positive predictive value was 78.3%, while the negative predictive value was 93.7%.

 

Unclear Clinical Need

Nelson noted that while this test aims to differentiate between arthritic diagnoses, patients can also have multiple conditions.

“Many individuals with rheumatoid arthritis will develop osteoarthritis, but they can have both, so a yes/no test is of unclear utility,” she said. OA and calcium pyrophosphate deposition (CPPD) disease can often occur together, “but the driver is really the OA, and the CPPD is present but not actively inflammatory,” she continued. “Septic arthritis should be readily distinguishable by cell count alone [and again, can coexist with any of the other conditions], and a thorough history and physical should be able to differentiate in most cases.”

While these results from this study are “reasonably impressive,” more clinical information is needed to interpret these results, added C. Kent Kwoh, MD, director of the University of Arizona Arthritis Center and professor of medicine and medical imaging at the University of Arizona College of Medicine, Tucson, Arizona.

Because the study is retrospective in nature and researchers obtained specimens from different sources, it was not clear if these patients were being treated when these samples were taken and if their various conditions were controlled or flaring.

“I would say this is a reasonable first step,” Kwoh said. “We would need prospective studies, more clinical characterization, and potentially longitudinal studies to understand when this test may be useful.”

This research was internally funded by Zimmer Biomet. All authors were employees of CD Diagnostics or CD Laboratories, both of which are subsidiaries of Zimmer Biomet. Kwoh reported receiving grants or contracts with AbbVie, Artiva, Eli Lilly and Company, Bristol Myers Squibb, Cumberland, Pfizer, GSK, and Galapagos, and consulting fees from TrialSpark/Formation Bio, Express Scripts, GSK, TLC BioSciences, and AposHealth. He participates on Data Safety Monitoring or Advisory Boards of Moebius Medical, Sun Pharma, Novartis, Xalud, and Kolon TissueGene. Nelson reported no relevant disclosures.

 

A version of this article appeared on Medscape.com.

A new diagnostic test can accurately distinguish osteoarthritis (OA) from inflammatory arthritis using two synovial fluid biomarkers, according to research published in the Journal of Orthopaedic Research on December 18, 2024.

However, experts question whether such a test would be useful.

“The need would seem to be fairly limited, mostly those with single joint involvement and a lack of other systemic features to specify a diagnosis, which is not that common, at least in rheumatology, where there are usually features in the history and physical that can clarify the diagnosis,” said Amanda E. Nelson, MD, MSCR, professor of medicine in the Division of Rheumatology, Allergy, and Immunology at the University of North Carolina at Chapel Hill. She was not involved with the research.

The test uses an algorithm that incorporates concentrations of cartilage oligomeric matrix protein (COMP) and interleukin 8 (IL-8) in synovial fluid. The researchers hypothesized that a ratio of the two biomarkers could distinguish between primary OA and other inflammatory arthritic diagnoses.

“Primary OA is unlikely when either COMP concentration or COMP/IL‐8 ratio in the synovial fluid is low since these conditions indicate either lack of cartilage degradation or presence of high inflammation,” wrote Daniel Keter and coauthors at CD Diagnostics, Claymont, Delaware, and CD Laboratories, Towson, Maryland. “In contrast, a high COMP concentration result in combination with high COMP/IL‐8 ratio would be suggestive of low inflammation in the setting of cartilage deterioration, which is indicative of primary OA.”

In patients with OA, synovial fluid can be difficult to aspirate in sufficient amounts for testing, Nelson said.

“If synovial fluid is present and able to be aspirated, it is unclear if this test has any benefit over a simple, standard cell count and crystal assessment, which can also distinguish between osteoarthritis and more inflammatory arthritides,” she said.

 

Differentiating OA

To test this potential diagnostic algorithm, researchers obtained 171 knee synovial fluid samples from approved clinical remnant sample sources and a biovendor. All samples were annotated with an existing arthritic diagnosis, including 54 with primary OA, 57 with rheumatoid arthritis (RA), 30 with crystal arthritis (CA), and 30 with native septic arthritis (NSA).

Researchers assigned a CA diagnosis based on the presence of monosodium urate or calcium pyrophosphate dehydrate crystals in the synovial fluid, and NSA was determined via the Synovasure Alpha Defensin test. OA was confirmed via radiograph as Kellgren‐Lawrence grades 2‐4 with no other arthritic diagnoses. RA samples were purchased via a biovendor, and researchers were not provided with diagnosis‐confirming data.

All samples were randomized and blinded before testing, and researchers used enzyme-linked immunosorbent assay tests for both COMP and IL-8 biomarkers.

Of the 54 OA samples, 47 tested positive for OA using the COMP + COMP/IL-8 ratio algorithm. Of the 117 samples with inflammatory arthritis, 13 tested positive for OA. Overall, the diagnostic algorithm demonstrated a clinical sensitivity of 87.0% and specificity of 88.9%. The positive predictive value was 78.3%, while the negative predictive value was 93.7%.

 

Unclear Clinical Need

Nelson noted that while this test aims to differentiate between arthritic diagnoses, patients can also have multiple conditions.

“Many individuals with rheumatoid arthritis will develop osteoarthritis, but they can have both, so a yes/no test is of unclear utility,” she said. OA and calcium pyrophosphate deposition (CPPD) disease can often occur together, “but the driver is really the OA, and the CPPD is present but not actively inflammatory,” she continued. “Septic arthritis should be readily distinguishable by cell count alone [and again, can coexist with any of the other conditions], and a thorough history and physical should be able to differentiate in most cases.”

While these results from this study are “reasonably impressive,” more clinical information is needed to interpret these results, added C. Kent Kwoh, MD, director of the University of Arizona Arthritis Center and professor of medicine and medical imaging at the University of Arizona College of Medicine, Tucson, Arizona.

Because the study is retrospective in nature and researchers obtained specimens from different sources, it was not clear if these patients were being treated when these samples were taken and if their various conditions were controlled or flaring.

“I would say this is a reasonable first step,” Kwoh said. “We would need prospective studies, more clinical characterization, and potentially longitudinal studies to understand when this test may be useful.”

This research was internally funded by Zimmer Biomet. All authors were employees of CD Diagnostics or CD Laboratories, both of which are subsidiaries of Zimmer Biomet. Kwoh reported receiving grants or contracts with AbbVie, Artiva, Eli Lilly and Company, Bristol Myers Squibb, Cumberland, Pfizer, GSK, and Galapagos, and consulting fees from TrialSpark/Formation Bio, Express Scripts, GSK, TLC BioSciences, and AposHealth. He participates on Data Safety Monitoring or Advisory Boards of Moebius Medical, Sun Pharma, Novartis, Xalud, and Kolon TissueGene. Nelson reported no relevant disclosures.

 

A version of this article appeared on Medscape.com.

A new diagnostic test can accurately distinguish osteoarthritis (OA) from inflammatory arthritis using two synovial fluid biomarkers, according to research published in the Journal of Orthopaedic Research on December 18, 2024.

However, experts question whether such a test would be useful.

“The need would seem to be fairly limited, mostly those with single joint involvement and a lack of other systemic features to specify a diagnosis, which is not that common, at least in rheumatology, where there are usually features in the history and physical that can clarify the diagnosis,” said Amanda E. Nelson, MD, MSCR, professor of medicine in the Division of Rheumatology, Allergy, and Immunology at the University of North Carolina at Chapel Hill. She was not involved with the research.

The test uses an algorithm that incorporates concentrations of cartilage oligomeric matrix protein (COMP) and interleukin 8 (IL-8) in synovial fluid. The researchers hypothesized that a ratio of the two biomarkers could distinguish between primary OA and other inflammatory arthritic diagnoses.

“Primary OA is unlikely when either COMP concentration or COMP/IL‐8 ratio in the synovial fluid is low since these conditions indicate either lack of cartilage degradation or presence of high inflammation,” wrote Daniel Keter and coauthors at CD Diagnostics, Claymont, Delaware, and CD Laboratories, Towson, Maryland. “In contrast, a high COMP concentration result in combination with high COMP/IL‐8 ratio would be suggestive of low inflammation in the setting of cartilage deterioration, which is indicative of primary OA.”

In patients with OA, synovial fluid can be difficult to aspirate in sufficient amounts for testing, Nelson said.

“If synovial fluid is present and able to be aspirated, it is unclear if this test has any benefit over a simple, standard cell count and crystal assessment, which can also distinguish between osteoarthritis and more inflammatory arthritides,” she said.

 

Differentiating OA

To test this potential diagnostic algorithm, researchers obtained 171 knee synovial fluid samples from approved clinical remnant sample sources and a biovendor. All samples were annotated with an existing arthritic diagnosis, including 54 with primary OA, 57 with rheumatoid arthritis (RA), 30 with crystal arthritis (CA), and 30 with native septic arthritis (NSA).

Researchers assigned a CA diagnosis based on the presence of monosodium urate or calcium pyrophosphate dehydrate crystals in the synovial fluid, and NSA was determined via the Synovasure Alpha Defensin test. OA was confirmed via radiograph as Kellgren‐Lawrence grades 2‐4 with no other arthritic diagnoses. RA samples were purchased via a biovendor, and researchers were not provided with diagnosis‐confirming data.

All samples were randomized and blinded before testing, and researchers used enzyme-linked immunosorbent assay tests for both COMP and IL-8 biomarkers.

Of the 54 OA samples, 47 tested positive for OA using the COMP + COMP/IL-8 ratio algorithm. Of the 117 samples with inflammatory arthritis, 13 tested positive for OA. Overall, the diagnostic algorithm demonstrated a clinical sensitivity of 87.0% and specificity of 88.9%. The positive predictive value was 78.3%, while the negative predictive value was 93.7%.

 

Unclear Clinical Need

Nelson noted that while this test aims to differentiate between arthritic diagnoses, patients can also have multiple conditions.

“Many individuals with rheumatoid arthritis will develop osteoarthritis, but they can have both, so a yes/no test is of unclear utility,” she said. OA and calcium pyrophosphate deposition (CPPD) disease can often occur together, “but the driver is really the OA, and the CPPD is present but not actively inflammatory,” she continued. “Septic arthritis should be readily distinguishable by cell count alone [and again, can coexist with any of the other conditions], and a thorough history and physical should be able to differentiate in most cases.”

While these results from this study are “reasonably impressive,” more clinical information is needed to interpret these results, added C. Kent Kwoh, MD, director of the University of Arizona Arthritis Center and professor of medicine and medical imaging at the University of Arizona College of Medicine, Tucson, Arizona.

Because the study is retrospective in nature and researchers obtained specimens from different sources, it was not clear if these patients were being treated when these samples were taken and if their various conditions were controlled or flaring.

“I would say this is a reasonable first step,” Kwoh said. “We would need prospective studies, more clinical characterization, and potentially longitudinal studies to understand when this test may be useful.”

This research was internally funded by Zimmer Biomet. All authors were employees of CD Diagnostics or CD Laboratories, both of which are subsidiaries of Zimmer Biomet. Kwoh reported receiving grants or contracts with AbbVie, Artiva, Eli Lilly and Company, Bristol Myers Squibb, Cumberland, Pfizer, GSK, and Galapagos, and consulting fees from TrialSpark/Formation Bio, Express Scripts, GSK, TLC BioSciences, and AposHealth. He participates on Data Safety Monitoring or Advisory Boards of Moebius Medical, Sun Pharma, Novartis, Xalud, and Kolon TissueGene. Nelson reported no relevant disclosures.

 

A version of this article appeared on Medscape.com.

For gout, xanthine oxidase (XO) inhibitors are the choice for first-line urate-lowering therapy (ULT) according to the 2020 American College of Rheumatology Guideline for the Management of Gout, which endorsed allopurinol, but should that be the approach for all patients, or should first-line therapy be tailored to the mechanism of each patient’s hyperuricemia? Two gout experts, Lisa Stamp, MBChB, PhD, a rheumatologist and professor of medicine at the University of Otago in Christchurch, New Zealand, and Fernando Pérez-Ruiz, MD, PhD, consultant in the Rheumatology Division of Cruces University Hospital, Barakaldo, head of the Investigation Group for Arthritis at Biocruces Health Research Institute, Barakaldo, and associate professor in the Department of Medicine at the Faculty of Medicine and Nursing at the University of the Basque Country in Leioa, Spain, debated this question recently at the annual research symposium of the Gout, Hyperuricemia and Crystal-Associated Disease Network.

Before the debate began, audience members voted on the question and 56% favored using XO inhibitors as a first-line therapy for all rather than tailoring first-line therapy to disease mechanism.

Up first, Stamp argued that XO inhibitors should be first-line therapy for all patients with gout. She said that XO inhibitors have been demonstrated to work regardless of the cause of hyperuricemia and degree of kidney function, and they are cheap, readily available, and easy to administer. She showed results from a study published by her debate opponent, Pérez-Ruiz, which demonstrated efficacy of XO inhibitors in both under-excreters and over-excreters of uric acid. That study compared the efficacy of the XO inhibitor allopurinol to the uricosuric agent benzbromarone and found the latter to be more effective, but Stamp argued that the allopurinol dose used in the study — 300 mg/d — “may not be enough for many patients who have gout. Dose-restricting allopurinol is one way to demonstrate that an alternative agent is superior,” she said.

A more recent study showed low-dose benzbromarone was better than low-dose febuxostat, another XO inhibitor. “I think we do need to have clinical trials that reflect real-world practice. I accept that this may have reflected [accepted practice where the studies] were undertaken, but these [XO inhibitor] doses don’t represent what many of us would do in other parts of the world,” Stamp said.

One concern is the utility of a ULT in patients with impaired renal function. Stamp cited her own post hoc analysis of a randomized, controlled trial showing that allopurinol is effective irrespective of renal function, as long as the dose is escalated to achieve target urate level, and a meta-analysis of observational studies suggesting that febuxostat is effective irrespective of renal function.

On the other hand, she showed data from a 1994 study of benzbromarone in renal transplant recipients, which showed that the drug’s effect on decreasing plasma uric acid dropped off significantly with lower creatinine clearance. “It does work, but the efficacy really drops off as renal function decreases. Benzbromarone is probably the most effective uricosuric in patients with renal impairment, but this agent is not readily available,” Stamp said.

The uricosuric agent probenecid, which is generally available across the world, led to only about 30% success in achieving target levels of uric acid among patients with an estimated glomerular filtration rate < 50 mL/min/1.73 m². “I think we can all agree that getting 30% of our patients to target uric acid is not an acceptable outcome,” she said.

Stamp emphasized the importance of drug availability and noted that allopurinol is also the only medication for gout that is on the World Health Organization list of essential medications. “I think we should be recommending medications that are readily available, irrespective of where you live,” she said, noting that this is true of allopurinol, febuxostat, and probenecid.

Stamp also addressed the mechanism of action of ULTs. “Does the cause of hyperuricemia affect treatment response? I don’t think it does. Most people respond to allopurinol whether they’re a normal excreter or an under-excreter. Everyone who is lacking uricase will respond to allopurinol. Not everyone will respond to a uricosuric [agent], particularly in the setting of comorbidities such as renal impairment, which many of our patients with gout have,” she said.

 

Counterargument: Combine Therapies With Different Mechanisms of Action

In his counterargument, Pérez-Ruiz contended that gout is not in fact a metabolic disease and suggested that combining therapies with different mechanisms of action could be the best approach for difficult-to-treat gout. “The problem we face in clinical practice is how to treat difficult-to-treat patients,” he said. He referenced his own PhD thesis, which showed both high urinary uric acid output and underexcretion among patients with gout.

Pérez-Ruiz agreed that XO inhibitors should be used as first-line therapy but noted that the effect of allopurinol tapers off at higher doses. “If you use very high doses of allopurinol, you cannot expect to get much more effect,” he said. This is also true of febuxostat, he said.

He showed another study that illustrated difficulties in achieving target serum urate level with intensive therapy. “Even using a high dose of allopurinol, if you would like to get lower than 3 mg/dL for intensive therapy, close to 50% of patients will fail,” he said.

Pérez-Ruiz described a strategy of combining XO inhibitors with a uricosuric therapy, creating what he called a “uricase-like effect” on serum uric acid levels. Ruiz-Perez uses high-dose febuxostat in patients with chronic kidney disease who cannot be given uricosuric agents. “You can go to very low [serum urate levels] by raising up the doses,” he said.

He does not believe that allopurinol is the best agent for combination therapy in the treatment of tophaceous deposits. Instead, he favors combinations with febuxostat. He presented his own experience with 12 patients with very severe tophaceous gout who he treated with a combination of febuxostat and benzbromarone, which reduced serum urate to just over 2 mg/dL. “So this is a pegloticase-like effect [that is] very useful for tophaceous gout,” he said.

In her response, Stamp noted that most of the studies presented by Pérez-Ruiz showed XO inhibitors as first-line therapies, with other medications added on. “I think I heard Fernando agree with me. In just about all of those slides, he showed that a xanthine oxidase inhibitor was the first-line therapy, and subsequently a uricosuric was added,” she said.

Still, Stamp took issue with the idea that serum urate needs to get as low as Pérez-Ruiz advocated for. “What’s the risk associated with getting a serum urate to that level? I’m not sure that a sustained serum urate of around 1 [mg/dL] is necessarily good in the long term,” she said.

Stamp also pointed out the potential risks of polypharmacy, along with adherence issues. “If we can give our patients one therapy, one drug that’s going to get them to a target that we know is going to have beneficial long-term effects, that’s going to help improve our adherence. Maybe we are coming to a new era of [treatment, with] remission induction driving the serum urate very low, and then a maintenance therapy where we can back off. But irrespective, if you use that strategy, Fernando nicely showed that every time you’re going to start with a xanthine oxidase inhibitor,” she said.

After the debate, audience members voted again, and this time the result was 66% in favor of XO inhibitors as a first-line treatment.

Pérez-Ruiz is an adviser for Arthrosi, LG, Novartis, Protalix, and SOBI. He is a speaker for Menarini Central America and the Spanish Foundation for Rheumatology and has received funding from Cruces Rheumatology Association. Stamp did not disclose any financial relationships.

A version of this article first appeared on Medscape.com.

For gout, xanthine oxidase (XO) inhibitors are the choice for first-line urate-lowering therapy (ULT) according to the 2020 American College of Rheumatology Guideline for the Management of Gout, which endorsed allopurinol, but should that be the approach for all patients, or should first-line therapy be tailored to the mechanism of each patient’s hyperuricemia? Two gout experts, Lisa Stamp, MBChB, PhD, a rheumatologist and professor of medicine at the University of Otago in Christchurch, New Zealand, and Fernando Pérez-Ruiz, MD, PhD, consultant in the Rheumatology Division of Cruces University Hospital, Barakaldo, head of the Investigation Group for Arthritis at Biocruces Health Research Institute, Barakaldo, and associate professor in the Department of Medicine at the Faculty of Medicine and Nursing at the University of the Basque Country in Leioa, Spain, debated this question recently at the annual research symposium of the Gout, Hyperuricemia and Crystal-Associated Disease Network.

Before the debate began, audience members voted on the question and 56% favored using XO inhibitors as a first-line therapy for all rather than tailoring first-line therapy to disease mechanism.

Up first, Stamp argued that XO inhibitors should be first-line therapy for all patients with gout. She said that XO inhibitors have been demonstrated to work regardless of the cause of hyperuricemia and degree of kidney function, and they are cheap, readily available, and easy to administer. She showed results from a study published by her debate opponent, Pérez-Ruiz, which demonstrated efficacy of XO inhibitors in both under-excreters and over-excreters of uric acid. That study compared the efficacy of the XO inhibitor allopurinol to the uricosuric agent benzbromarone and found the latter to be more effective, but Stamp argued that the allopurinol dose used in the study — 300 mg/d — “may not be enough for many patients who have gout. Dose-restricting allopurinol is one way to demonstrate that an alternative agent is superior,” she said.

A more recent study showed low-dose benzbromarone was better than low-dose febuxostat, another XO inhibitor. “I think we do need to have clinical trials that reflect real-world practice. I accept that this may have reflected [accepted practice where the studies] were undertaken, but these [XO inhibitor] doses don’t represent what many of us would do in other parts of the world,” Stamp said.

One concern is the utility of a ULT in patients with impaired renal function. Stamp cited her own post hoc analysis of a randomized, controlled trial showing that allopurinol is effective irrespective of renal function, as long as the dose is escalated to achieve target urate level, and a meta-analysis of observational studies suggesting that febuxostat is effective irrespective of renal function.

On the other hand, she showed data from a 1994 study of benzbromarone in renal transplant recipients, which showed that the drug’s effect on decreasing plasma uric acid dropped off significantly with lower creatinine clearance. “It does work, but the efficacy really drops off as renal function decreases. Benzbromarone is probably the most effective uricosuric in patients with renal impairment, but this agent is not readily available,” Stamp said.

The uricosuric agent probenecid, which is generally available across the world, led to only about 30% success in achieving target levels of uric acid among patients with an estimated glomerular filtration rate < 50 mL/min/1.73 m². “I think we can all agree that getting 30% of our patients to target uric acid is not an acceptable outcome,” she said.

Stamp emphasized the importance of drug availability and noted that allopurinol is also the only medication for gout that is on the World Health Organization list of essential medications. “I think we should be recommending medications that are readily available, irrespective of where you live,” she said, noting that this is true of allopurinol, febuxostat, and probenecid.

Stamp also addressed the mechanism of action of ULTs. “Does the cause of hyperuricemia affect treatment response? I don’t think it does. Most people respond to allopurinol whether they’re a normal excreter or an under-excreter. Everyone who is lacking uricase will respond to allopurinol. Not everyone will respond to a uricosuric [agent], particularly in the setting of comorbidities such as renal impairment, which many of our patients with gout have,” she said.

 

Counterargument: Combine Therapies With Different Mechanisms of Action

In his counterargument, Pérez-Ruiz contended that gout is not in fact a metabolic disease and suggested that combining therapies with different mechanisms of action could be the best approach for difficult-to-treat gout. “The problem we face in clinical practice is how to treat difficult-to-treat patients,” he said. He referenced his own PhD thesis, which showed both high urinary uric acid output and underexcretion among patients with gout.

Pérez-Ruiz agreed that XO inhibitors should be used as first-line therapy but noted that the effect of allopurinol tapers off at higher doses. “If you use very high doses of allopurinol, you cannot expect to get much more effect,” he said. This is also true of febuxostat, he said.

He showed another study that illustrated difficulties in achieving target serum urate level with intensive therapy. “Even using a high dose of allopurinol, if you would like to get lower than 3 mg/dL for intensive therapy, close to 50% of patients will fail,” he said.

Pérez-Ruiz described a strategy of combining XO inhibitors with a uricosuric therapy, creating what he called a “uricase-like effect” on serum uric acid levels. Ruiz-Perez uses high-dose febuxostat in patients with chronic kidney disease who cannot be given uricosuric agents. “You can go to very low [serum urate levels] by raising up the doses,” he said.

He does not believe that allopurinol is the best agent for combination therapy in the treatment of tophaceous deposits. Instead, he favors combinations with febuxostat. He presented his own experience with 12 patients with very severe tophaceous gout who he treated with a combination of febuxostat and benzbromarone, which reduced serum urate to just over 2 mg/dL. “So this is a pegloticase-like effect [that is] very useful for tophaceous gout,” he said.

In her response, Stamp noted that most of the studies presented by Pérez-Ruiz showed XO inhibitors as first-line therapies, with other medications added on. “I think I heard Fernando agree with me. In just about all of those slides, he showed that a xanthine oxidase inhibitor was the first-line therapy, and subsequently a uricosuric was added,” she said.

Still, Stamp took issue with the idea that serum urate needs to get as low as Pérez-Ruiz advocated for. “What’s the risk associated with getting a serum urate to that level? I’m not sure that a sustained serum urate of around 1 [mg/dL] is necessarily good in the long term,” she said.

Stamp also pointed out the potential risks of polypharmacy, along with adherence issues. “If we can give our patients one therapy, one drug that’s going to get them to a target that we know is going to have beneficial long-term effects, that’s going to help improve our adherence. Maybe we are coming to a new era of [treatment, with] remission induction driving the serum urate very low, and then a maintenance therapy where we can back off. But irrespective, if you use that strategy, Fernando nicely showed that every time you’re going to start with a xanthine oxidase inhibitor,” she said.

After the debate, audience members voted again, and this time the result was 66% in favor of XO inhibitors as a first-line treatment.

Pérez-Ruiz is an adviser for Arthrosi, LG, Novartis, Protalix, and SOBI. He is a speaker for Menarini Central America and the Spanish Foundation for Rheumatology and has received funding from Cruces Rheumatology Association. Stamp did not disclose any financial relationships.

A version of this article first appeared on Medscape.com.

For gout, xanthine oxidase (XO) inhibitors are the choice for first-line urate-lowering therapy (ULT) according to the 2020 American College of Rheumatology Guideline for the Management of Gout, which endorsed allopurinol, but should that be the approach for all patients, or should first-line therapy be tailored to the mechanism of each patient’s hyperuricemia? Two gout experts, Lisa Stamp, MBChB, PhD, a rheumatologist and professor of medicine at the University of Otago in Christchurch, New Zealand, and Fernando Pérez-Ruiz, MD, PhD, consultant in the Rheumatology Division of Cruces University Hospital, Barakaldo, head of the Investigation Group for Arthritis at Biocruces Health Research Institute, Barakaldo, and associate professor in the Department of Medicine at the Faculty of Medicine and Nursing at the University of the Basque Country in Leioa, Spain, debated this question recently at the annual research symposium of the Gout, Hyperuricemia and Crystal-Associated Disease Network.

Before the debate began, audience members voted on the question and 56% favored using XO inhibitors as a first-line therapy for all rather than tailoring first-line therapy to disease mechanism.

Up first, Stamp argued that XO inhibitors should be first-line therapy for all patients with gout. She said that XO inhibitors have been demonstrated to work regardless of the cause of hyperuricemia and degree of kidney function, and they are cheap, readily available, and easy to administer. She showed results from a study published by her debate opponent, Pérez-Ruiz, which demonstrated efficacy of XO inhibitors in both under-excreters and over-excreters of uric acid. That study compared the efficacy of the XO inhibitor allopurinol to the uricosuric agent benzbromarone and found the latter to be more effective, but Stamp argued that the allopurinol dose used in the study — 300 mg/d — “may not be enough for many patients who have gout. Dose-restricting allopurinol is one way to demonstrate that an alternative agent is superior,” she said.

A more recent study showed low-dose benzbromarone was better than low-dose febuxostat, another XO inhibitor. “I think we do need to have clinical trials that reflect real-world practice. I accept that this may have reflected [accepted practice where the studies] were undertaken, but these [XO inhibitor] doses don’t represent what many of us would do in other parts of the world,” Stamp said.

One concern is the utility of a ULT in patients with impaired renal function. Stamp cited her own post hoc analysis of a randomized, controlled trial showing that allopurinol is effective irrespective of renal function, as long as the dose is escalated to achieve target urate level, and a meta-analysis of observational studies suggesting that febuxostat is effective irrespective of renal function.

On the other hand, she showed data from a 1994 study of benzbromarone in renal transplant recipients, which showed that the drug’s effect on decreasing plasma uric acid dropped off significantly with lower creatinine clearance. “It does work, but the efficacy really drops off as renal function decreases. Benzbromarone is probably the most effective uricosuric in patients with renal impairment, but this agent is not readily available,” Stamp said.

The uricosuric agent probenecid, which is generally available across the world, led to only about 30% success in achieving target levels of uric acid among patients with an estimated glomerular filtration rate < 50 mL/min/1.73 m². “I think we can all agree that getting 30% of our patients to target uric acid is not an acceptable outcome,” she said.

Stamp emphasized the importance of drug availability and noted that allopurinol is also the only medication for gout that is on the World Health Organization list of essential medications. “I think we should be recommending medications that are readily available, irrespective of where you live,” she said, noting that this is true of allopurinol, febuxostat, and probenecid.

Stamp also addressed the mechanism of action of ULTs. “Does the cause of hyperuricemia affect treatment response? I don’t think it does. Most people respond to allopurinol whether they’re a normal excreter or an under-excreter. Everyone who is lacking uricase will respond to allopurinol. Not everyone will respond to a uricosuric [agent], particularly in the setting of comorbidities such as renal impairment, which many of our patients with gout have,” she said.

 

Counterargument: Combine Therapies With Different Mechanisms of Action

In his counterargument, Pérez-Ruiz contended that gout is not in fact a metabolic disease and suggested that combining therapies with different mechanisms of action could be the best approach for difficult-to-treat gout. “The problem we face in clinical practice is how to treat difficult-to-treat patients,” he said. He referenced his own PhD thesis, which showed both high urinary uric acid output and underexcretion among patients with gout.

Pérez-Ruiz agreed that XO inhibitors should be used as first-line therapy but noted that the effect of allopurinol tapers off at higher doses. “If you use very high doses of allopurinol, you cannot expect to get much more effect,” he said. This is also true of febuxostat, he said.

He showed another study that illustrated difficulties in achieving target serum urate level with intensive therapy. “Even using a high dose of allopurinol, if you would like to get lower than 3 mg/dL for intensive therapy, close to 50% of patients will fail,” he said.

Pérez-Ruiz described a strategy of combining XO inhibitors with a uricosuric therapy, creating what he called a “uricase-like effect” on serum uric acid levels. Ruiz-Perez uses high-dose febuxostat in patients with chronic kidney disease who cannot be given uricosuric agents. “You can go to very low [serum urate levels] by raising up the doses,” he said.

He does not believe that allopurinol is the best agent for combination therapy in the treatment of tophaceous deposits. Instead, he favors combinations with febuxostat. He presented his own experience with 12 patients with very severe tophaceous gout who he treated with a combination of febuxostat and benzbromarone, which reduced serum urate to just over 2 mg/dL. “So this is a pegloticase-like effect [that is] very useful for tophaceous gout,” he said.

In her response, Stamp noted that most of the studies presented by Pérez-Ruiz showed XO inhibitors as first-line therapies, with other medications added on. “I think I heard Fernando agree with me. In just about all of those slides, he showed that a xanthine oxidase inhibitor was the first-line therapy, and subsequently a uricosuric was added,” she said.

Still, Stamp took issue with the idea that serum urate needs to get as low as Pérez-Ruiz advocated for. “What’s the risk associated with getting a serum urate to that level? I’m not sure that a sustained serum urate of around 1 [mg/dL] is necessarily good in the long term,” she said.

Stamp also pointed out the potential risks of polypharmacy, along with adherence issues. “If we can give our patients one therapy, one drug that’s going to get them to a target that we know is going to have beneficial long-term effects, that’s going to help improve our adherence. Maybe we are coming to a new era of [treatment, with] remission induction driving the serum urate very low, and then a maintenance therapy where we can back off. But irrespective, if you use that strategy, Fernando nicely showed that every time you’re going to start with a xanthine oxidase inhibitor,” she said.

After the debate, audience members voted again, and this time the result was 66% in favor of XO inhibitors as a first-line treatment.

Pérez-Ruiz is an adviser for Arthrosi, LG, Novartis, Protalix, and SOBI. He is a speaker for Menarini Central America and the Spanish Foundation for Rheumatology and has received funding from Cruces Rheumatology Association. Stamp did not disclose any financial relationships.

A version of this article first appeared on Medscape.com.

A Mediterranean-inspired plant-based diet improved self-reported measures of gout as well as uric acid levels, a pilot study has found. 

There hasn’t been a lot of research on diet in gout, according to Anna Kretova, RD, who presented the study at the annual research symposium of the Gout Hyperuricemia and Crystal-Associated Disease Network. She noted that a 2019 systematic review of low-calorie diets, low-purine diets, and Mediterranean diets found that uric acid levels below 0.6 mmol/L were achieved only in those on the Mediterranean diet (Nutrients. 2019 Dec 4;11[12]:2955). A 2020 study compared a low-fat, high-carbohydrate, plant-based diet vs an animal-based, ketogenic diet in healthy individuals. After 2 weeks, uric acid levels increased in those on the animal-based, low-carb diet and decreased in those on the plant-based diet. 

Some foods are considered to be proinflammatory and generally come from animal origins, including saturated fats and animal protein in addition to ultraprocessed foods. Foods that have anti-inflammatory properties are mostly plant based and unprocessed and often rich in fiber. “From recent interventional studies, we also know that the whole-foods plant-based diet has shown to be effective as treatments of the main comorbidities of gout, such as obesity, cardiovascular disease, or [osteoarthritis],” said Kretova, who is a registered dietitian and a researcher at the Reade Rehabilitation and Rheumatology Center, Amsterdam, the Netherlands. 

Those findings led the researchers to develop a whole-foods, plant-based diet and test its effect on serum uric acid in patients with gout, as well as gout disease activity and cardiovascular disease risk. Participants could not eat meat, fish, eggs, or dairy. 

The trial included 33 individuals with gout who were randomized to a 16-week intervention with five consultations with a registered dietitian (n = 18) or a wait-list control group (n = 15) who received standard care. The mean age overall was 52 years, and 91% were men. The mean body mass index (BMI) was 32.6 kg/m2, and the median uric acid level was 0.50 mmol/L (8.4 mg/dL).

Among gout-related outcomes, the researchers noted improvements in gout severity as measured by visual analog scale (VAS; between group difference, –2.0; P =.01), pain as measured by VAS (between group difference, –2.0; P =.04), and uric acid levels after adjustment for age, sex, and BMI (between group difference, –0.05 mmol/L, P =.004). There were also improvements in the intervention group in weight loss (between group difference, –5.3 kg; P <.0001), BMI (between group difference, –1.7; P < .0001), waist circumference (between group difference, –3.9 cm; P = .004), and low-density lipoprotein (LDL) cholesterol (between group difference, –0.5; P = .007).

At 16 weeks, “we concluded that a Mediterranean-inspired whole-foods, plant-based diet significantly lowers serum uric acid in patients with gout and abdominal obesity, and additionally, the diet reduces gout-related pain and disease activity, promotes substantial weight loss, decreases weight circumference, and improves LDL cholesterol levels, and thus decreases [cardiovascular disease] risk in these patients,” Kretova said. 

She added that some might question whether a uric acid reduction of –0.05 mmol/L is clinically relevant. “We would argue it is because of the strong decrease in disease activity and pain in the intervention group,” Kretova said. 

The study is limited by its small size, the fact that it was not blinded, and the 4-month duration, which might be too short to capture potential indirect effects of diet on hyperuricemia and chronic inflammation, Kretova said. The group is planning to follow participants out to 12 months in an extension study.

During the Q&A session after the presentation, an audience member asked if the participants were vegetarians before they entered the study, and whether the dietary change could be sustained. “It’s a very good proof-of-concept study, but whether an intervention based entirely on plant-based therapy will be something that patients will be able to adhere to long term [is uncertain],” Kretova said.

She was optimistic, even though the participants generally enjoyed food and ate a lot of red meat. “I think there will be a gradation of people who can sustain and who cannot sustain [the diet]. From what we saw, people actually found it easier to follow than they expected, and a lot of participants changed their diet permanently for the better. Not everyone became [entirely] plant-based, but they became much more plant-based than they expected from themselves. So, it is definitely feasible,” she said.

Kretova reported no relevant financial relationships.

A version of this article appeared on Medscape.com.

A Mediterranean-inspired plant-based diet improved self-reported measures of gout as well as uric acid levels, a pilot study has found. 

There hasn’t been a lot of research on diet in gout, according to Anna Kretova, RD, who presented the study at the annual research symposium of the Gout Hyperuricemia and Crystal-Associated Disease Network. She noted that a 2019 systematic review of low-calorie diets, low-purine diets, and Mediterranean diets found that uric acid levels below 0.6 mmol/L were achieved only in those on the Mediterranean diet (Nutrients. 2019 Dec 4;11[12]:2955). A 2020 study compared a low-fat, high-carbohydrate, plant-based diet vs an animal-based, ketogenic diet in healthy individuals. After 2 weeks, uric acid levels increased in those on the animal-based, low-carb diet and decreased in those on the plant-based diet. 

Some foods are considered to be proinflammatory and generally come from animal origins, including saturated fats and animal protein in addition to ultraprocessed foods. Foods that have anti-inflammatory properties are mostly plant based and unprocessed and often rich in fiber. “From recent interventional studies, we also know that the whole-foods plant-based diet has shown to be effective as treatments of the main comorbidities of gout, such as obesity, cardiovascular disease, or [osteoarthritis],” said Kretova, who is a registered dietitian and a researcher at the Reade Rehabilitation and Rheumatology Center, Amsterdam, the Netherlands. 

Those findings led the researchers to develop a whole-foods, plant-based diet and test its effect on serum uric acid in patients with gout, as well as gout disease activity and cardiovascular disease risk. Participants could not eat meat, fish, eggs, or dairy. 

The trial included 33 individuals with gout who were randomized to a 16-week intervention with five consultations with a registered dietitian (n = 18) or a wait-list control group (n = 15) who received standard care. The mean age overall was 52 years, and 91% were men. The mean body mass index (BMI) was 32.6 kg/m2, and the median uric acid level was 0.50 mmol/L (8.4 mg/dL).

Among gout-related outcomes, the researchers noted improvements in gout severity as measured by visual analog scale (VAS; between group difference, –2.0; P =.01), pain as measured by VAS (between group difference, –2.0; P =.04), and uric acid levels after adjustment for age, sex, and BMI (between group difference, –0.05 mmol/L, P =.004). There were also improvements in the intervention group in weight loss (between group difference, –5.3 kg; P <.0001), BMI (between group difference, –1.7; P < .0001), waist circumference (between group difference, –3.9 cm; P = .004), and low-density lipoprotein (LDL) cholesterol (between group difference, –0.5; P = .007).

At 16 weeks, “we concluded that a Mediterranean-inspired whole-foods, plant-based diet significantly lowers serum uric acid in patients with gout and abdominal obesity, and additionally, the diet reduces gout-related pain and disease activity, promotes substantial weight loss, decreases weight circumference, and improves LDL cholesterol levels, and thus decreases [cardiovascular disease] risk in these patients,” Kretova said. 

She added that some might question whether a uric acid reduction of –0.05 mmol/L is clinically relevant. “We would argue it is because of the strong decrease in disease activity and pain in the intervention group,” Kretova said. 

The study is limited by its small size, the fact that it was not blinded, and the 4-month duration, which might be too short to capture potential indirect effects of diet on hyperuricemia and chronic inflammation, Kretova said. The group is planning to follow participants out to 12 months in an extension study.

During the Q&A session after the presentation, an audience member asked if the participants were vegetarians before they entered the study, and whether the dietary change could be sustained. “It’s a very good proof-of-concept study, but whether an intervention based entirely on plant-based therapy will be something that patients will be able to adhere to long term [is uncertain],” Kretova said.

She was optimistic, even though the participants generally enjoyed food and ate a lot of red meat. “I think there will be a gradation of people who can sustain and who cannot sustain [the diet]. From what we saw, people actually found it easier to follow than they expected, and a lot of participants changed their diet permanently for the better. Not everyone became [entirely] plant-based, but they became much more plant-based than they expected from themselves. So, it is definitely feasible,” she said.

Kretova reported no relevant financial relationships.

A version of this article appeared on Medscape.com.

A Mediterranean-inspired plant-based diet improved self-reported measures of gout as well as uric acid levels, a pilot study has found. 

There hasn’t been a lot of research on diet in gout, according to Anna Kretova, RD, who presented the study at the annual research symposium of the Gout Hyperuricemia and Crystal-Associated Disease Network. She noted that a 2019 systematic review of low-calorie diets, low-purine diets, and Mediterranean diets found that uric acid levels below 0.6 mmol/L were achieved only in those on the Mediterranean diet (Nutrients. 2019 Dec 4;11[12]:2955). A 2020 study compared a low-fat, high-carbohydrate, plant-based diet vs an animal-based, ketogenic diet in healthy individuals. After 2 weeks, uric acid levels increased in those on the animal-based, low-carb diet and decreased in those on the plant-based diet. 

Some foods are considered to be proinflammatory and generally come from animal origins, including saturated fats and animal protein in addition to ultraprocessed foods. Foods that have anti-inflammatory properties are mostly plant based and unprocessed and often rich in fiber. “From recent interventional studies, we also know that the whole-foods plant-based diet has shown to be effective as treatments of the main comorbidities of gout, such as obesity, cardiovascular disease, or [osteoarthritis],” said Kretova, who is a registered dietitian and a researcher at the Reade Rehabilitation and Rheumatology Center, Amsterdam, the Netherlands. 

Those findings led the researchers to develop a whole-foods, plant-based diet and test its effect on serum uric acid in patients with gout, as well as gout disease activity and cardiovascular disease risk. Participants could not eat meat, fish, eggs, or dairy. 

The trial included 33 individuals with gout who were randomized to a 16-week intervention with five consultations with a registered dietitian (n = 18) or a wait-list control group (n = 15) who received standard care. The mean age overall was 52 years, and 91% were men. The mean body mass index (BMI) was 32.6 kg/m2, and the median uric acid level was 0.50 mmol/L (8.4 mg/dL).

Among gout-related outcomes, the researchers noted improvements in gout severity as measured by visual analog scale (VAS; between group difference, –2.0; P =.01), pain as measured by VAS (between group difference, –2.0; P =.04), and uric acid levels after adjustment for age, sex, and BMI (between group difference, –0.05 mmol/L, P =.004). There were also improvements in the intervention group in weight loss (between group difference, –5.3 kg; P <.0001), BMI (between group difference, –1.7; P < .0001), waist circumference (between group difference, –3.9 cm; P = .004), and low-density lipoprotein (LDL) cholesterol (between group difference, –0.5; P = .007).

At 16 weeks, “we concluded that a Mediterranean-inspired whole-foods, plant-based diet significantly lowers serum uric acid in patients with gout and abdominal obesity, and additionally, the diet reduces gout-related pain and disease activity, promotes substantial weight loss, decreases weight circumference, and improves LDL cholesterol levels, and thus decreases [cardiovascular disease] risk in these patients,” Kretova said. 

She added that some might question whether a uric acid reduction of –0.05 mmol/L is clinically relevant. “We would argue it is because of the strong decrease in disease activity and pain in the intervention group,” Kretova said. 

The study is limited by its small size, the fact that it was not blinded, and the 4-month duration, which might be too short to capture potential indirect effects of diet on hyperuricemia and chronic inflammation, Kretova said. The group is planning to follow participants out to 12 months in an extension study.

During the Q&A session after the presentation, an audience member asked if the participants were vegetarians before they entered the study, and whether the dietary change could be sustained. “It’s a very good proof-of-concept study, but whether an intervention based entirely on plant-based therapy will be something that patients will be able to adhere to long term [is uncertain],” Kretova said.

She was optimistic, even though the participants generally enjoyed food and ate a lot of red meat. “I think there will be a gradation of people who can sustain and who cannot sustain [the diet]. From what we saw, people actually found it easier to follow than they expected, and a lot of participants changed their diet permanently for the better. Not everyone became [entirely] plant-based, but they became much more plant-based than they expected from themselves. So, it is definitely feasible,” she said.

Kretova reported no relevant financial relationships.

A version of this article appeared on Medscape.com.

In a nearly unanimous vote at the annual research symposium of the Gout Hyperuricemia and Crystal-Associated Disease Network (G-CAN), members approved a revision to gout remission criteria first established in 2016. The new version simplifies the definition in response to patient comments that the earlier version was redundant in some areas. 

The previous version was developed following deliberations by 49 clinicians and researchers with experience in gout. They settled on a definition of gout remission that included five criteria:

• Serum urate levels lower than 0.36 mmol/L measured at least twice over 12 months, with no intervening values of 0.36 mmol/L or higher
• No gout flares over 12 months
• No tophi
• Pain score due to gout < 2 at least twice over 12 months on a 10-point Likert scale or 10-cm visual analog scale, with no intervening values ≥ 2
• Patient global assessment of gout disease activity < 2 on a 10-point Likert scale or 10-cm visual analog scale, with no intervening values of ≥ 2.

Some participants reported that patients sometimes misattributed pain from other sources while using patient-reported outcomes (PROs). The argument for keeping PROs was that they are validated measures and endorsed by Outcome Measures in Rheumatology. Nevertheless, there was no direct patient involvement in the development of the 2016 criteria.

Researchers later interviewed 20 individuals with well-controlled gout to get their feedback on the 2016 criteria. Those individuals endorsed the existing criteria and did not suggest any new ones, but they suggested that the pain due to gout and the absence of gout flares were redundant measures. One said: “If you have no flare-ups, you’ve got no pain; it sort of answers itself.”

“That was a bit challenging for us because it wasn’t quite what we expected, but I think it did make us look again at the definition and think about whether we could simplify the definition further,” Nicola Dalbeth, MBChB, said during a presentation at G-CAN. Dalbeth is an academic rheumatologist at the University of Auckland, in New Zealand, who was also the lead author of the original criteria.

 

Simplified Version Created With Only Three Criteria

In response to these points, researchers produced a revised version with only three criteria, including the serum urate, absence of gout flares, and absence of subcutaneous tophi at the time of assessment.

To determine if the simplified criteria performed well, they compared the original and revised remission criteria in the context of the CARES trial, the Nottingham nurse-led trial, and randomized controlled trials in patients with gout that were conducted in New Zealand (here and here).

Dansoa Tabi-Amponsah, a PhD candidate at the University of Auckland, presented results of a study comparing the two versions in the Nottingham trial, which included 517 participants who received nurse-led or usual general practitioner care. The nurse-led care included education, regular follow-up and serum urate testing, individualized advice on gout flare management, and escalation of urate-lowering therapy with a treat-to-target strategy.

Both definitions demonstrated a link between the nurse-led strategy and increased rates of remission at year 1 and year 2, although the simplified definition found that more patients were in remission (17.6% vs 9.9% at year 1 and 42.7% vs 28.4% at year 2, both P < .001). “This is something we’ve seen across all of our analyses,” said Tabi-Amponsah. 

Both criteria also found significant differences in remission rates between the nurse-led group in year 2 vs year 1 but not in the usual care group.

Participants who achieved remission had better gout impact scale scores in areas like worrying that a gout attack will occur, fears of worsening gout, and concerns about the impact of gout on future activities. “This is important because during that qualitative study, a key aspect of being in remission was no longer being worried about their gout, no longer feeling anxious about having constant gout flares, and having control over their gout. So, it’s important to note that despite the absence of PROs in that simplified definition, it’s still able to align with the patients’ perspectives of their disease state,” said Tabi-Amponsah.

During the Q&A period after her talk, an audience member asked whether the higher rate of remission found by the simplified criteria is actually a good thing. “If I compare that to rheumatoid arthritis, when you use DAS28 you have a lot more remission, but still progression. So, are we missing some people? Are we including people in remission that still have disease?” she asked. 

Tabi-Amponsah responded that the pain and patient global assessment domains seem to be quite difficult to achieve. In a separate analysis, the researchers examined tender and swollen joint counts and found that those achieving remission no longer had tender or swollen joints. “So, we don’t think the simplified definition is heavily misclassifying anyone as being in remission,” she said. 

During the Q&A following Dalbeth’s talk, an audience member asked about patients with what he described as “mountains of tophi,” despite responding well to uricase therapy. “They may take months or even a year to really resolve that burden. They may be doing very well, yet they’re not going to be in remission because they’ve still got visible tophi. So, are we underselling them, and do we need a different definition for them doing well that this doesn’t capture?” he asked.

Dalbeth suggested that patients with large amounts of tophi aren’t really in remission. “I think we do need to be thinking about the disease, not just in terms of just crystals or just inflammation, but actually trying to integrate both of those, and I think this is where these composite measures might work quite well. I think we need to be aiming for holistic disease control, which is essentially what this is,” she said. 

Tabi-Amponsah and Dalbeth did not disclose any financial relationships. 

 

A version of this article appeared on Medscape.com.

In a nearly unanimous vote at the annual research symposium of the Gout Hyperuricemia and Crystal-Associated Disease Network (G-CAN), members approved a revision to gout remission criteria first established in 2016. The new version simplifies the definition in response to patient comments that the earlier version was redundant in some areas. 

The previous version was developed following deliberations by 49 clinicians and researchers with experience in gout. They settled on a definition of gout remission that included five criteria:

• Serum urate levels lower than 0.36 mmol/L measured at least twice over 12 months, with no intervening values of 0.36 mmol/L or higher
• No gout flares over 12 months
• No tophi
• Pain score due to gout < 2 at least twice over 12 months on a 10-point Likert scale or 10-cm visual analog scale, with no intervening values ≥ 2
• Patient global assessment of gout disease activity < 2 on a 10-point Likert scale or 10-cm visual analog scale, with no intervening values of ≥ 2.

Some participants reported that patients sometimes misattributed pain from other sources while using patient-reported outcomes (PROs). The argument for keeping PROs was that they are validated measures and endorsed by Outcome Measures in Rheumatology. Nevertheless, there was no direct patient involvement in the development of the 2016 criteria.

Researchers later interviewed 20 individuals with well-controlled gout to get their feedback on the 2016 criteria. Those individuals endorsed the existing criteria and did not suggest any new ones, but they suggested that the pain due to gout and the absence of gout flares were redundant measures. One said: “If you have no flare-ups, you’ve got no pain; it sort of answers itself.”

“That was a bit challenging for us because it wasn’t quite what we expected, but I think it did make us look again at the definition and think about whether we could simplify the definition further,” Nicola Dalbeth, MBChB, said during a presentation at G-CAN. Dalbeth is an academic rheumatologist at the University of Auckland, in New Zealand, who was also the lead author of the original criteria.

 

Simplified Version Created With Only Three Criteria

In response to these points, researchers produced a revised version with only three criteria, including the serum urate, absence of gout flares, and absence of subcutaneous tophi at the time of assessment.

To determine if the simplified criteria performed well, they compared the original and revised remission criteria in the context of the CARES trial, the Nottingham nurse-led trial, and randomized controlled trials in patients with gout that were conducted in New Zealand (here and here).

Dansoa Tabi-Amponsah, a PhD candidate at the University of Auckland, presented results of a study comparing the two versions in the Nottingham trial, which included 517 participants who received nurse-led or usual general practitioner care. The nurse-led care included education, regular follow-up and serum urate testing, individualized advice on gout flare management, and escalation of urate-lowering therapy with a treat-to-target strategy.

Both definitions demonstrated a link between the nurse-led strategy and increased rates of remission at year 1 and year 2, although the simplified definition found that more patients were in remission (17.6% vs 9.9% at year 1 and 42.7% vs 28.4% at year 2, both P < .001). “This is something we’ve seen across all of our analyses,” said Tabi-Amponsah. 

Both criteria also found significant differences in remission rates between the nurse-led group in year 2 vs year 1 but not in the usual care group.

Participants who achieved remission had better gout impact scale scores in areas like worrying that a gout attack will occur, fears of worsening gout, and concerns about the impact of gout on future activities. “This is important because during that qualitative study, a key aspect of being in remission was no longer being worried about their gout, no longer feeling anxious about having constant gout flares, and having control over their gout. So, it’s important to note that despite the absence of PROs in that simplified definition, it’s still able to align with the patients’ perspectives of their disease state,” said Tabi-Amponsah.

During the Q&A period after her talk, an audience member asked whether the higher rate of remission found by the simplified criteria is actually a good thing. “If I compare that to rheumatoid arthritis, when you use DAS28 you have a lot more remission, but still progression. So, are we missing some people? Are we including people in remission that still have disease?” she asked. 

Tabi-Amponsah responded that the pain and patient global assessment domains seem to be quite difficult to achieve. In a separate analysis, the researchers examined tender and swollen joint counts and found that those achieving remission no longer had tender or swollen joints. “So, we don’t think the simplified definition is heavily misclassifying anyone as being in remission,” she said. 

During the Q&A following Dalbeth’s talk, an audience member asked about patients with what he described as “mountains of tophi,” despite responding well to uricase therapy. “They may take months or even a year to really resolve that burden. They may be doing very well, yet they’re not going to be in remission because they’ve still got visible tophi. So, are we underselling them, and do we need a different definition for them doing well that this doesn’t capture?” he asked.

Dalbeth suggested that patients with large amounts of tophi aren’t really in remission. “I think we do need to be thinking about the disease, not just in terms of just crystals or just inflammation, but actually trying to integrate both of those, and I think this is where these composite measures might work quite well. I think we need to be aiming for holistic disease control, which is essentially what this is,” she said. 

Tabi-Amponsah and Dalbeth did not disclose any financial relationships. 

 

A version of this article appeared on Medscape.com.

In a nearly unanimous vote at the annual research symposium of the Gout Hyperuricemia and Crystal-Associated Disease Network (G-CAN), members approved a revision to gout remission criteria first established in 2016. The new version simplifies the definition in response to patient comments that the earlier version was redundant in some areas. 

The previous version was developed following deliberations by 49 clinicians and researchers with experience in gout. They settled on a definition of gout remission that included five criteria:

• Serum urate levels lower than 0.36 mmol/L measured at least twice over 12 months, with no intervening values of 0.36 mmol/L or higher
• No gout flares over 12 months
• No tophi
• Pain score due to gout < 2 at least twice over 12 months on a 10-point Likert scale or 10-cm visual analog scale, with no intervening values ≥ 2
• Patient global assessment of gout disease activity < 2 on a 10-point Likert scale or 10-cm visual analog scale, with no intervening values of ≥ 2.

Some participants reported that patients sometimes misattributed pain from other sources while using patient-reported outcomes (PROs). The argument for keeping PROs was that they are validated measures and endorsed by Outcome Measures in Rheumatology. Nevertheless, there was no direct patient involvement in the development of the 2016 criteria.

Researchers later interviewed 20 individuals with well-controlled gout to get their feedback on the 2016 criteria. Those individuals endorsed the existing criteria and did not suggest any new ones, but they suggested that the pain due to gout and the absence of gout flares were redundant measures. One said: “If you have no flare-ups, you’ve got no pain; it sort of answers itself.”

“That was a bit challenging for us because it wasn’t quite what we expected, but I think it did make us look again at the definition and think about whether we could simplify the definition further,” Nicola Dalbeth, MBChB, said during a presentation at G-CAN. Dalbeth is an academic rheumatologist at the University of Auckland, in New Zealand, who was also the lead author of the original criteria.

 

Simplified Version Created With Only Three Criteria

In response to these points, researchers produced a revised version with only three criteria, including the serum urate, absence of gout flares, and absence of subcutaneous tophi at the time of assessment.

To determine if the simplified criteria performed well, they compared the original and revised remission criteria in the context of the CARES trial, the Nottingham nurse-led trial, and randomized controlled trials in patients with gout that were conducted in New Zealand (here and here).

Dansoa Tabi-Amponsah, a PhD candidate at the University of Auckland, presented results of a study comparing the two versions in the Nottingham trial, which included 517 participants who received nurse-led or usual general practitioner care. The nurse-led care included education, regular follow-up and serum urate testing, individualized advice on gout flare management, and escalation of urate-lowering therapy with a treat-to-target strategy.

Both definitions demonstrated a link between the nurse-led strategy and increased rates of remission at year 1 and year 2, although the simplified definition found that more patients were in remission (17.6% vs 9.9% at year 1 and 42.7% vs 28.4% at year 2, both P < .001). “This is something we’ve seen across all of our analyses,” said Tabi-Amponsah. 

Both criteria also found significant differences in remission rates between the nurse-led group in year 2 vs year 1 but not in the usual care group.

Participants who achieved remission had better gout impact scale scores in areas like worrying that a gout attack will occur, fears of worsening gout, and concerns about the impact of gout on future activities. “This is important because during that qualitative study, a key aspect of being in remission was no longer being worried about their gout, no longer feeling anxious about having constant gout flares, and having control over their gout. So, it’s important to note that despite the absence of PROs in that simplified definition, it’s still able to align with the patients’ perspectives of their disease state,” said Tabi-Amponsah.

During the Q&A period after her talk, an audience member asked whether the higher rate of remission found by the simplified criteria is actually a good thing. “If I compare that to rheumatoid arthritis, when you use DAS28 you have a lot more remission, but still progression. So, are we missing some people? Are we including people in remission that still have disease?” she asked. 

Tabi-Amponsah responded that the pain and patient global assessment domains seem to be quite difficult to achieve. In a separate analysis, the researchers examined tender and swollen joint counts and found that those achieving remission no longer had tender or swollen joints. “So, we don’t think the simplified definition is heavily misclassifying anyone as being in remission,” she said. 

During the Q&A following Dalbeth’s talk, an audience member asked about patients with what he described as “mountains of tophi,” despite responding well to uricase therapy. “They may take months or even a year to really resolve that burden. They may be doing very well, yet they’re not going to be in remission because they’ve still got visible tophi. So, are we underselling them, and do we need a different definition for them doing well that this doesn’t capture?” he asked.

Dalbeth suggested that patients with large amounts of tophi aren’t really in remission. “I think we do need to be thinking about the disease, not just in terms of just crystals or just inflammation, but actually trying to integrate both of those, and I think this is where these composite measures might work quite well. I think we need to be aiming for holistic disease control, which is essentially what this is,” she said. 

Tabi-Amponsah and Dalbeth did not disclose any financial relationships. 

 

A version of this article appeared on Medscape.com.

Efforts to combat hyperuricemia may find help from gut microbes, according to Dylan Dodd, MD, PhD, who spoke at the annual research symposium of the Gout, Hyperuricemia, and Crystal-Associated Disease Network.

Dodd is an assistant professor of pathology and microbiology and immunology at Stanford University, Palo Alto, California, where he studies novel metabolic pathways in microbes. “The idea is that we can leverage these novel pathways that microbes have as therapeutics to promote human health, and in particular for this meeting today, we’re focused on hyperuricemia and how microbes that break down purines may actually have a role as urate-lowering therapies,” Dodd said during his presentation.

Specifically, he highlighted the fact that some microbes found in the gut break down purines as a food source, producing both energy and molecular building blocks for their own use. Dietary purines, left intact, can otherwise be absorbed and metabolized by the body to produce urate.

Nucleic acids like DNA and RNA in the diet are first broken down by enzymes produced in the pancreas, resulting in purine nucleosides, which in turn are believed to be the source of purines absorbed in the small intestine and eventually into circulation, according to Dodd. “I really view urate in the intestine as being in equilibrium between being secreted into the lumen but also being reabsorbed, and specifically, as it pertains to microbes in the gut. If the microbes degrade the urate, then it will limit its reabsorption, and that could increase net excretion,” Dodd said.

There is evidence that some strains of Lactobacillus species, which are the most important group in the human gut, can metabolize purine nucleosides, he said. In recent years, researchers have screened for Lactobacillus species capable of metabolizing purine nucleosides. The research shows some strain-to-strain variation, but most are proprietary, making it impossible to conduct follow-up research. A small number of human trials have suggested efficacy, but they have generally been conducted in few patients with mixed results. “Overall, I think it’s promising that these lactobacilli probiotics could potentially be used as urate-lowering therapies,” Dodd said.

Aside from direct metabolism of purines, Dodd’s group has identified an additional pathway that some microbes can use to break down urate into short-chain fatty acids. His group cultured various purine nucleosides with various bacterial strains, including two Lactobacillus strains, under anaerobic conditions. The Lactobacillus strains did not degrade urate, but some bacterial species did. The group also found that Lactobacillus could convert nucleosides, including those derived from purines, into the smaller nucleobase compounds, but they did not consume the resultant purines. Some other types of bacteria consumed all purines “voraciously,” according to Dodd, and his team is working to identify the bacterial genetic pathways that drive the metabolic pathways. 

Such studies may open up various therapeutic pathways, he said. One is to employ Lactobacillus probiotics to convert purine nucleosides to their nucleobases, which could reduce absorption in the small intestine. Other bacteria could potentially be used to convert urate produced by paracellular reabsorption to short-chain fatty acids, which have potential benefits through their anti-inflammatory properties. Finally, probiotics could be engineered to degrade urate produced in the intestine. 

Dodd noted that probiotics would have the advantage of high patient acceptance and are generally regarded as safe. Some existing products might have purine-degrading capabilities but haven’t been tested, he said. However, there is strain-to-strain variation and the probiotic formulas would likely need to be optimized to reduce nucleobases. On the other hand, bacteria that degrade urate are likely safe since they have been found in the guts of healthy individuals. However, there are still potential safety concerns, and it is unknown if they could withstand the harsh conditions of the upper gastrointestinal tract or if they would remain active even in the presence of oxygen found in the small intestine, he said. 

During the Q&A period after his talk, Dodd was asked whether fructose consumption could suppress the function of anaerobic bacteria that naturally degrade purine. “When people talk about fructose-induced hyperuricemia, they talk about the ATP degradation in fructose metabolism in the liver or small intestine, [but] they never talk about this potential pathway in the gut,” the questioner said.

Dodd responded that his group found that some carbohydrates suppress urate degradation in some bacterial strains. “It’s certainly a possible mechanism that increased fructose intake could suppress microbial urate degradation in the gut, and that could contribute to hyperuricemia, but obviously more studies need to be done,” he said.

Another audience member wondered if antibiotic use could be tied to gout risk and whether serum urate levels might rise after antibiotic use. “Do you have any data on serum urate before and after antibiotic use, where you might expect to see changes which might support your hypothesis?” she asked. Dodd said that the group had done a retrospective analysis of data from Stanford’s medical records and did not find a change in serum urate after antibiotic exposure. However, a controlled feeding study of healthy individuals who later received antibiotics showed a large increase in urate levels, but the study did not include plasma samples. “It’s a really good question, and we hope to be able to follow that up,” he said.

Dodd disclosed no relevant financial relationships.

 

A version of this article appeared on Medscape.com.

Efforts to combat hyperuricemia may find help from gut microbes, according to Dylan Dodd, MD, PhD, who spoke at the annual research symposium of the Gout, Hyperuricemia, and Crystal-Associated Disease Network.

Dodd is an assistant professor of pathology and microbiology and immunology at Stanford University, Palo Alto, California, where he studies novel metabolic pathways in microbes. “The idea is that we can leverage these novel pathways that microbes have as therapeutics to promote human health, and in particular for this meeting today, we’re focused on hyperuricemia and how microbes that break down purines may actually have a role as urate-lowering therapies,” Dodd said during his presentation.

Specifically, he highlighted the fact that some microbes found in the gut break down purines as a food source, producing both energy and molecular building blocks for their own use. Dietary purines, left intact, can otherwise be absorbed and metabolized by the body to produce urate.

Nucleic acids like DNA and RNA in the diet are first broken down by enzymes produced in the pancreas, resulting in purine nucleosides, which in turn are believed to be the source of purines absorbed in the small intestine and eventually into circulation, according to Dodd. “I really view urate in the intestine as being in equilibrium between being secreted into the lumen but also being reabsorbed, and specifically, as it pertains to microbes in the gut. If the microbes degrade the urate, then it will limit its reabsorption, and that could increase net excretion,” Dodd said.

There is evidence that some strains of Lactobacillus species, which are the most important group in the human gut, can metabolize purine nucleosides, he said. In recent years, researchers have screened for Lactobacillus species capable of metabolizing purine nucleosides. The research shows some strain-to-strain variation, but most are proprietary, making it impossible to conduct follow-up research. A small number of human trials have suggested efficacy, but they have generally been conducted in few patients with mixed results. “Overall, I think it’s promising that these lactobacilli probiotics could potentially be used as urate-lowering therapies,” Dodd said.

Aside from direct metabolism of purines, Dodd’s group has identified an additional pathway that some microbes can use to break down urate into short-chain fatty acids. His group cultured various purine nucleosides with various bacterial strains, including two Lactobacillus strains, under anaerobic conditions. The Lactobacillus strains did not degrade urate, but some bacterial species did. The group also found that Lactobacillus could convert nucleosides, including those derived from purines, into the smaller nucleobase compounds, but they did not consume the resultant purines. Some other types of bacteria consumed all purines “voraciously,” according to Dodd, and his team is working to identify the bacterial genetic pathways that drive the metabolic pathways. 

Such studies may open up various therapeutic pathways, he said. One is to employ Lactobacillus probiotics to convert purine nucleosides to their nucleobases, which could reduce absorption in the small intestine. Other bacteria could potentially be used to convert urate produced by paracellular reabsorption to short-chain fatty acids, which have potential benefits through their anti-inflammatory properties. Finally, probiotics could be engineered to degrade urate produced in the intestine. 

Dodd noted that probiotics would have the advantage of high patient acceptance and are generally regarded as safe. Some existing products might have purine-degrading capabilities but haven’t been tested, he said. However, there is strain-to-strain variation and the probiotic formulas would likely need to be optimized to reduce nucleobases. On the other hand, bacteria that degrade urate are likely safe since they have been found in the guts of healthy individuals. However, there are still potential safety concerns, and it is unknown if they could withstand the harsh conditions of the upper gastrointestinal tract or if they would remain active even in the presence of oxygen found in the small intestine, he said. 

During the Q&A period after his talk, Dodd was asked whether fructose consumption could suppress the function of anaerobic bacteria that naturally degrade purine. “When people talk about fructose-induced hyperuricemia, they talk about the ATP degradation in fructose metabolism in the liver or small intestine, [but] they never talk about this potential pathway in the gut,” the questioner said.

Dodd responded that his group found that some carbohydrates suppress urate degradation in some bacterial strains. “It’s certainly a possible mechanism that increased fructose intake could suppress microbial urate degradation in the gut, and that could contribute to hyperuricemia, but obviously more studies need to be done,” he said.

Another audience member wondered if antibiotic use could be tied to gout risk and whether serum urate levels might rise after antibiotic use. “Do you have any data on serum urate before and after antibiotic use, where you might expect to see changes which might support your hypothesis?” she asked. Dodd said that the group had done a retrospective analysis of data from Stanford’s medical records and did not find a change in serum urate after antibiotic exposure. However, a controlled feeding study of healthy individuals who later received antibiotics showed a large increase in urate levels, but the study did not include plasma samples. “It’s a really good question, and we hope to be able to follow that up,” he said.

Dodd disclosed no relevant financial relationships.

 

A version of this article appeared on Medscape.com.

Efforts to combat hyperuricemia may find help from gut microbes, according to Dylan Dodd, MD, PhD, who spoke at the annual research symposium of the Gout, Hyperuricemia, and Crystal-Associated Disease Network.

Dodd is an assistant professor of pathology and microbiology and immunology at Stanford University, Palo Alto, California, where he studies novel metabolic pathways in microbes. “The idea is that we can leverage these novel pathways that microbes have as therapeutics to promote human health, and in particular for this meeting today, we’re focused on hyperuricemia and how microbes that break down purines may actually have a role as urate-lowering therapies,” Dodd said during his presentation.

Specifically, he highlighted the fact that some microbes found in the gut break down purines as a food source, producing both energy and molecular building blocks for their own use. Dietary purines, left intact, can otherwise be absorbed and metabolized by the body to produce urate.

Nucleic acids like DNA and RNA in the diet are first broken down by enzymes produced in the pancreas, resulting in purine nucleosides, which in turn are believed to be the source of purines absorbed in the small intestine and eventually into circulation, according to Dodd. “I really view urate in the intestine as being in equilibrium between being secreted into the lumen but also being reabsorbed, and specifically, as it pertains to microbes in the gut. If the microbes degrade the urate, then it will limit its reabsorption, and that could increase net excretion,” Dodd said.

There is evidence that some strains of Lactobacillus species, which are the most important group in the human gut, can metabolize purine nucleosides, he said. In recent years, researchers have screened for Lactobacillus species capable of metabolizing purine nucleosides. The research shows some strain-to-strain variation, but most are proprietary, making it impossible to conduct follow-up research. A small number of human trials have suggested efficacy, but they have generally been conducted in few patients with mixed results. “Overall, I think it’s promising that these lactobacilli probiotics could potentially be used as urate-lowering therapies,” Dodd said.

Aside from direct metabolism of purines, Dodd’s group has identified an additional pathway that some microbes can use to break down urate into short-chain fatty acids. His group cultured various purine nucleosides with various bacterial strains, including two Lactobacillus strains, under anaerobic conditions. The Lactobacillus strains did not degrade urate, but some bacterial species did. The group also found that Lactobacillus could convert nucleosides, including those derived from purines, into the smaller nucleobase compounds, but they did not consume the resultant purines. Some other types of bacteria consumed all purines “voraciously,” according to Dodd, and his team is working to identify the bacterial genetic pathways that drive the metabolic pathways. 

Such studies may open up various therapeutic pathways, he said. One is to employ Lactobacillus probiotics to convert purine nucleosides to their nucleobases, which could reduce absorption in the small intestine. Other bacteria could potentially be used to convert urate produced by paracellular reabsorption to short-chain fatty acids, which have potential benefits through their anti-inflammatory properties. Finally, probiotics could be engineered to degrade urate produced in the intestine. 

Dodd noted that probiotics would have the advantage of high patient acceptance and are generally regarded as safe. Some existing products might have purine-degrading capabilities but haven’t been tested, he said. However, there is strain-to-strain variation and the probiotic formulas would likely need to be optimized to reduce nucleobases. On the other hand, bacteria that degrade urate are likely safe since they have been found in the guts of healthy individuals. However, there are still potential safety concerns, and it is unknown if they could withstand the harsh conditions of the upper gastrointestinal tract or if they would remain active even in the presence of oxygen found in the small intestine, he said. 

During the Q&A period after his talk, Dodd was asked whether fructose consumption could suppress the function of anaerobic bacteria that naturally degrade purine. “When people talk about fructose-induced hyperuricemia, they talk about the ATP degradation in fructose metabolism in the liver or small intestine, [but] they never talk about this potential pathway in the gut,” the questioner said.

Dodd responded that his group found that some carbohydrates suppress urate degradation in some bacterial strains. “It’s certainly a possible mechanism that increased fructose intake could suppress microbial urate degradation in the gut, and that could contribute to hyperuricemia, but obviously more studies need to be done,” he said.

Another audience member wondered if antibiotic use could be tied to gout risk and whether serum urate levels might rise after antibiotic use. “Do you have any data on serum urate before and after antibiotic use, where you might expect to see changes which might support your hypothesis?” she asked. Dodd said that the group had done a retrospective analysis of data from Stanford’s medical records and did not find a change in serum urate after antibiotic exposure. However, a controlled feeding study of healthy individuals who later received antibiotics showed a large increase in urate levels, but the study did not include plasma samples. “It’s a really good question, and we hope to be able to follow that up,” he said.

Dodd disclosed no relevant financial relationships.

 

A version of this article appeared on Medscape.com.

WASHINGTON — Use of sodium-glucose cotransporter 2 inhibitors (SGLT2i) reduced the need for urate-lowering therapy (ULT) and gout flare therapies in people who had both type 2 diabetes (T2D) and gout, new research has found.

Data from a large US claims database showed that SGLT2i use was associated with a 31% lower rate of initiation of ULT. “This provides further support for the use of SLGT2i therapy in patients with gout, particularly those with high-risk multimorbidity and polypharmacy,” Greg Challener, MD, a postdoctoral fellow at the Rheumatology and Allergy Clinical Epidemiology Research Center, Massachusetts General Hospital, Boston, said in his presentation of the data at the annual meeting of the American College of Rheumatology.

The first agent of the SGLT2i class, dapagliflozin, was initially approved in the United States a decade ago for treating T2D. Since then, several other “flozins” have become available, and some have also received additional indications for heart failure and albuminuric chronic kidney disease. Several prior studies have linked SGLT2i use with lower rates of gout flares as well as lower likelihood of developing gout in the first place, although not all studies have found this benefit.

Asked about the clinical implications of the new data, Challener said in an interview that “I don’t think we’re quite at the point where this is changing gout management per se, but this just helps us understand that [SGT2is] may have a role at some point, maybe as a combination on top of another agent. Or, in some patients, it really may be enough if they’re already on an SGLT2i where we don’t need to jump to adding allopurinol. Maybe they have tophi, but they were just started on an SGLT2i and they’re not flaring. Typically, you would start those patients on allopurinol, but you could potentially just monitor them if they were just started on one of those [SGLT2i] agents.” 

Asked to comment, session moderator J. Antonio Aviña-Zubieta, MD, PhD, head of the Division of Rheumatology at the University of British Columbia, Vancouver, Canada, and senior scientist at Arthritis Research Canada, said in an interview: “What I can see possibly happening when there’s more evidence is that SGLT2is may be used or even become standard of care as an adjuvant therapy to decrease flares, and by that, decrease the risk of complications.”

 

Reductions in ULT, Flares, and Healthcare Visits

The new study used administrative health data from the multicenter TriNetX Diamond network of electronic medical record and claims data from 92 healthcare sites with 212 million patients. Among those with both T2D and gout who were not taking ULT at baseline, a total of 16,104 initiated SGLT2is and 16,046 initiated glucagon-like peptide 1 receptor agonists (GLP-1 RA).

Propensity score matching was conducted for demographics including age, race, and sex; comorbidities; use of emergency, inpatient, and critical care services; medications; labs; and body mass index. That yielded 11,800 individuals each in the SGLT2i and GLP-1 RA groups.

Over 5 years, 9.9% of the SGLT2i group vs 13.4% of those using GLP-1 RA had initiated ULT, a significant difference with a hazard ratio (HR) of 0.69 (95% CI, 0.64-0.75). The risk for initiation of colchicine for gout flares was 4.7% with SGLT2i vs 6.0% for GLP-1 RA — also a significant difference with an HR of 0.74 (0.65-0.83).

Medical visits for gout occurred in 28.0% vs 28.4% of patients, which also reached statistical significance (HR, 0.94; 95% CI, 0.89-0.99).

Aviña-Zubieta, an author of one of the previous studies finding a reduction in gout flares with SGLT2i, said, “many patients do not want to start gout therapy until they start having more acute attacks. ... So, for a lot of people, it’s a burden taking another pill to prevent one attack. But, if you don’t treat it over time, the attacks come more often. So, can we still delay the initiation of therapy? If you’re not having that many flares, you’re decreasing the burden of the disease and polypharmacy, which I think is the potential benefit in the long run if you already have an indication for the therapy for diabetes. ... These data are supporting that.” 

Indeed, Challener said these data can help in counseling patients. “Taking your SGLT2i for your heart failure and your diabetes is also providing some benefit for your gout, and we know that there is also cardiac benefit when gout is controlled.” 

Challener and Aviña-Zubieta had no disclosures.

A version of this article first appeared on Medscape.com.

WASHINGTON — Use of sodium-glucose cotransporter 2 inhibitors (SGLT2i) reduced the need for urate-lowering therapy (ULT) and gout flare therapies in people who had both type 2 diabetes (T2D) and gout, new research has found.

Data from a large US claims database showed that SGLT2i use was associated with a 31% lower rate of initiation of ULT. “This provides further support for the use of SLGT2i therapy in patients with gout, particularly those with high-risk multimorbidity and polypharmacy,” Greg Challener, MD, a postdoctoral fellow at the Rheumatology and Allergy Clinical Epidemiology Research Center, Massachusetts General Hospital, Boston, said in his presentation of the data at the annual meeting of the American College of Rheumatology.

The first agent of the SGLT2i class, dapagliflozin, was initially approved in the United States a decade ago for treating T2D. Since then, several other “flozins” have become available, and some have also received additional indications for heart failure and albuminuric chronic kidney disease. Several prior studies have linked SGLT2i use with lower rates of gout flares as well as lower likelihood of developing gout in the first place, although not all studies have found this benefit.

Asked about the clinical implications of the new data, Challener said in an interview that “I don’t think we’re quite at the point where this is changing gout management per se, but this just helps us understand that [SGT2is] may have a role at some point, maybe as a combination on top of another agent. Or, in some patients, it really may be enough if they’re already on an SGLT2i where we don’t need to jump to adding allopurinol. Maybe they have tophi, but they were just started on an SGLT2i and they’re not flaring. Typically, you would start those patients on allopurinol, but you could potentially just monitor them if they were just started on one of those [SGLT2i] agents.” 

Asked to comment, session moderator J. Antonio Aviña-Zubieta, MD, PhD, head of the Division of Rheumatology at the University of British Columbia, Vancouver, Canada, and senior scientist at Arthritis Research Canada, said in an interview: “What I can see possibly happening when there’s more evidence is that SGLT2is may be used or even become standard of care as an adjuvant therapy to decrease flares, and by that, decrease the risk of complications.”

 

Reductions in ULT, Flares, and Healthcare Visits

The new study used administrative health data from the multicenter TriNetX Diamond network of electronic medical record and claims data from 92 healthcare sites with 212 million patients. Among those with both T2D and gout who were not taking ULT at baseline, a total of 16,104 initiated SGLT2is and 16,046 initiated glucagon-like peptide 1 receptor agonists (GLP-1 RA).

Propensity score matching was conducted for demographics including age, race, and sex; comorbidities; use of emergency, inpatient, and critical care services; medications; labs; and body mass index. That yielded 11,800 individuals each in the SGLT2i and GLP-1 RA groups.

Over 5 years, 9.9% of the SGLT2i group vs 13.4% of those using GLP-1 RA had initiated ULT, a significant difference with a hazard ratio (HR) of 0.69 (95% CI, 0.64-0.75). The risk for initiation of colchicine for gout flares was 4.7% with SGLT2i vs 6.0% for GLP-1 RA — also a significant difference with an HR of 0.74 (0.65-0.83).

Medical visits for gout occurred in 28.0% vs 28.4% of patients, which also reached statistical significance (HR, 0.94; 95% CI, 0.89-0.99).

Aviña-Zubieta, an author of one of the previous studies finding a reduction in gout flares with SGLT2i, said, “many patients do not want to start gout therapy until they start having more acute attacks. ... So, for a lot of people, it’s a burden taking another pill to prevent one attack. But, if you don’t treat it over time, the attacks come more often. So, can we still delay the initiation of therapy? If you’re not having that many flares, you’re decreasing the burden of the disease and polypharmacy, which I think is the potential benefit in the long run if you already have an indication for the therapy for diabetes. ... These data are supporting that.” 

Indeed, Challener said these data can help in counseling patients. “Taking your SGLT2i for your heart failure and your diabetes is also providing some benefit for your gout, and we know that there is also cardiac benefit when gout is controlled.” 

Challener and Aviña-Zubieta had no disclosures.

A version of this article first appeared on Medscape.com.

WASHINGTON — Use of sodium-glucose cotransporter 2 inhibitors (SGLT2i) reduced the need for urate-lowering therapy (ULT) and gout flare therapies in people who had both type 2 diabetes (T2D) and gout, new research has found.

Data from a large US claims database showed that SGLT2i use was associated with a 31% lower rate of initiation of ULT. “This provides further support for the use of SLGT2i therapy in patients with gout, particularly those with high-risk multimorbidity and polypharmacy,” Greg Challener, MD, a postdoctoral fellow at the Rheumatology and Allergy Clinical Epidemiology Research Center, Massachusetts General Hospital, Boston, said in his presentation of the data at the annual meeting of the American College of Rheumatology.

The first agent of the SGLT2i class, dapagliflozin, was initially approved in the United States a decade ago for treating T2D. Since then, several other “flozins” have become available, and some have also received additional indications for heart failure and albuminuric chronic kidney disease. Several prior studies have linked SGLT2i use with lower rates of gout flares as well as lower likelihood of developing gout in the first place, although not all studies have found this benefit.

Asked about the clinical implications of the new data, Challener said in an interview that “I don’t think we’re quite at the point where this is changing gout management per se, but this just helps us understand that [SGT2is] may have a role at some point, maybe as a combination on top of another agent. Or, in some patients, it really may be enough if they’re already on an SGLT2i where we don’t need to jump to adding allopurinol. Maybe they have tophi, but they were just started on an SGLT2i and they’re not flaring. Typically, you would start those patients on allopurinol, but you could potentially just monitor them if they were just started on one of those [SGLT2i] agents.” 

Asked to comment, session moderator J. Antonio Aviña-Zubieta, MD, PhD, head of the Division of Rheumatology at the University of British Columbia, Vancouver, Canada, and senior scientist at Arthritis Research Canada, said in an interview: “What I can see possibly happening when there’s more evidence is that SGLT2is may be used or even become standard of care as an adjuvant therapy to decrease flares, and by that, decrease the risk of complications.”

 

Reductions in ULT, Flares, and Healthcare Visits

The new study used administrative health data from the multicenter TriNetX Diamond network of electronic medical record and claims data from 92 healthcare sites with 212 million patients. Among those with both T2D and gout who were not taking ULT at baseline, a total of 16,104 initiated SGLT2is and 16,046 initiated glucagon-like peptide 1 receptor agonists (GLP-1 RA).

Propensity score matching was conducted for demographics including age, race, and sex; comorbidities; use of emergency, inpatient, and critical care services; medications; labs; and body mass index. That yielded 11,800 individuals each in the SGLT2i and GLP-1 RA groups.

Over 5 years, 9.9% of the SGLT2i group vs 13.4% of those using GLP-1 RA had initiated ULT, a significant difference with a hazard ratio (HR) of 0.69 (95% CI, 0.64-0.75). The risk for initiation of colchicine for gout flares was 4.7% with SGLT2i vs 6.0% for GLP-1 RA — also a significant difference with an HR of 0.74 (0.65-0.83).

Medical visits for gout occurred in 28.0% vs 28.4% of patients, which also reached statistical significance (HR, 0.94; 95% CI, 0.89-0.99).

Aviña-Zubieta, an author of one of the previous studies finding a reduction in gout flares with SGLT2i, said, “many patients do not want to start gout therapy until they start having more acute attacks. ... So, for a lot of people, it’s a burden taking another pill to prevent one attack. But, if you don’t treat it over time, the attacks come more often. So, can we still delay the initiation of therapy? If you’re not having that many flares, you’re decreasing the burden of the disease and polypharmacy, which I think is the potential benefit in the long run if you already have an indication for the therapy for diabetes. ... These data are supporting that.” 

Indeed, Challener said these data can help in counseling patients. “Taking your SGLT2i for your heart failure and your diabetes is also providing some benefit for your gout, and we know that there is also cardiac benefit when gout is controlled.” 

Challener and Aviña-Zubieta had no disclosures.

A version of this article first appeared on Medscape.com.