Lung Cancer

Wildfire smoke exposure may be associated with increased risks for multiple types of cancer, suggests an analysis of prospective cohort data from over 90,000 individuals.

To determine how this widespread pollution might be affecting cancer risk, senior author Shuguang Leng, MBBS, PhD, and colleagues analyzed data from the Prostate, Lung, Colorectal, and Ovarian (PLCO) Cancer Screening Trial. That prospective national study enrolled approximately 154,000 participants between 1993 and 2001 and tracked cancer incidence through 2018. Of these, 91,460 participants had wildfire smoke exposure data and were included in the analysis.

During the 2006-2018 exposure period, the investigators identified incident cases of 242 ovarian, 800 colorectal, 896 bladder, 1696 hematopoietic, 1739 breast, and 1758 lung cancers, as well as 1127 melanoma cases. The median 36-month moving average for wildfire smoke PM_2.5 (fine particulate matter) across the cohort was 0.37 µg/m³.

Wildfire smoke exposure was significantly associated with increased risks for lung, colorectal, breast, bladder, and hematopoietic cancer, according to the results of the study presented by Leng at American Association for Cancer Research (AACR) Annual Meeting 2026.

Each 1 µg/m³ increase in the 36-month moving average of wildfire smoke PM_2.5 was associated with a 63% higher risk for hematopoietic cancer (HR, 1.63; 95% CI, 1.02-2.60), a nearly twofold higher risk for lung cancer (hazard ratio [HR], 1.92; 95% CI, 1.18-3.15), more than twofold higher risks for breast cancer (HR, 2.09; 95% CI, 1.34-3.26) and colorectal cancer (HR, 2.31; 95% CI, 1.11-4.81), and a more than threefold higher risk for bladder cancer (HR, 3.49; 95% CI, 1.66-7.34). No significant associations were observed for ovarian cancer or melanoma.

The investigators quantified wildfire smoke exposure at each participant’s residence on a monthly basis using three measures: near-ground wildfire smoke PM_2.5, wildfire smoke black carbon, and satellite-derived wildfire smoke plume-day counts, with measurements available from 2006 until first cancer diagnosis or last contact.

Given evidence that 3 years of air pollution exposure can influence the development of epidermal growth factor receptor-positive lung adenocarcinoma, the team modeled exposure as a time-varying variable using 36-month moving averages preceding each month. HRs were estimated using Cox proportional hazards models stratified by study center, with restricted cubic splines applied to evaluate dose-response relationships. Models were adjusted for age, sex, race and ethnicity, education, smoking history, BMI, and trial arm.

All five cancer types linked with wildfire smoke exposure showed linear dose-response relationships, Leng noted, “which means the higher the exposure, the higher the cancer risk.”

Results based on wildfire smoke plume-day counts were generally consistent with those for PM_2.5, while associations for black carbon exposure were observed only for breast and bladder cancers.

With wildfires on the rise, these findings suggest that the resulting smoke may become a “major driver for cancer burden in the US in the coming decades,” said Leng, of the University of New Mexico Comprehensive Cancer Center, Albuquerque, New Mexico.

“Wildfire smoke has become a major source of air pollution in the United States,” he continued. Large fires in the US are three times more common than they were 50 years ago, and the “tons of toxicants and particles” released by these fires “can travel hundreds of miles to affect communities far away.”

The investigators also conducted histology-specific analyses, finding that adenocarcinoma showed the strongest association with wildfire smoke among lung cancer subtypes. Among colorectal cancers, proximal tumors appeared more sensitive to wildfire smoke exposure, while among bladder cancers, the association was strongest for muscle-invasive disease.

Wildfire Smoke Exposure Expected to Rise

Under even the most conservative climate projections, wildfire smoke exposure in the US is expected to rise over the next 20-30 years, Leng said.

Annual average wildfire smoke PM_2.5 levels, currently estimated at around 0.5 µg/m³, could rise to 1 µg/m³. Based on the study’s dose-response data, this would correspond to substantially greater cancer risk.

There will be “a much larger area” of the US exposed “at a much higher dose,” Leng predicted.

Mitigating the Risks of Wildfire Smoke

This is a “strong hypothesis-generating study,” Jun Wu, PhD, professor of environmental and occupational health at the UC Irvine Program in Public Health, Irvine, California, told Medscape Medical News.

“This is one of the first large, prospective US cohort studies to examine wildfire smoke specifically in relation to cancer risk, especially cancer sites beyond the lung,” Wu said. “A major strength is that the PLCO platform has around 91,000 participants with longitudinal follow-up and detailed covariate data, including smoking history, which is often a weak point in previous air pollution-cancer studies.”

According to Wu, who was not involved in the analysis but recently published data linking wildfire smoke exposure to preterm birth, the reported risks for colorectal, breast, bladder, and hematopoietic cancers represent novel contributions to the literature. However, she cautioned against viewing the specific HRs as a precise estimates of risk due to wide confidence intervals.

The findings should encourage individuals, public health officials, and clinicians to mitigate the risks of wildfire smoke, Wu said.

Specifically, she suggested that public health assessments expand beyond acute outcomes like emergency department visits to include long-term endpoints such as cancer, while community clean-air shelters need to be made more widely available.

She advised clinicians to incorporate wildfire exposure into routine patient histories and to provide vulnerable patients — such as those with asthma, chronic obstructive pulmonary disease, heart failure, or pregnancy — with smoke-season action plans.

Risk mitigation begins with awareness, according to Wu, who advised individuals check their local air quality index on AirNow.gov or PurpleAir.

On smoky days, she suggested prioritizing indoor air quality by keeping windows closed and running air purifiers. If going outside on such days is necessary, she suggested an N95 or KN95 mask, as these offer “meaningful protection,” while cloth and surgical masks do not.

These preventive steps may have once been out of the ordinary, Wu said, but the risk for wildfire smoke exposure is becoming a part of everyday life.

“The common thread is a shift in framing,” Wu said. “Wildfire smoke has traditionally been treated as an acute event, but the emerging evidence points to a chronic environmental exposure. Both our clinical and public health systems have room to grow into that reality.”

The analysis was funded by the National Institutes of Health. The investigators and Wu reported having no conflicts of interest.

This article was previously published on Medscape.

Wildfire smoke exposure may be associated with increased risks for multiple types of cancer, suggests an analysis of prospective cohort data from over 90,000 individuals.

To determine how this widespread pollution might be affecting cancer risk, senior author Shuguang Leng, MBBS, PhD, and colleagues analyzed data from the Prostate, Lung, Colorectal, and Ovarian (PLCO) Cancer Screening Trial. That prospective national study enrolled approximately 154,000 participants between 1993 and 2001 and tracked cancer incidence through 2018. Of these, 91,460 participants had wildfire smoke exposure data and were included in the analysis.

During the 2006-2018 exposure period, the investigators identified incident cases of 242 ovarian, 800 colorectal, 896 bladder, 1696 hematopoietic, 1739 breast, and 1758 lung cancers, as well as 1127 melanoma cases. The median 36-month moving average for wildfire smoke PM_2.5 (fine particulate matter) across the cohort was 0.37 µg/m³.

Wildfire smoke exposure was significantly associated with increased risks for lung, colorectal, breast, bladder, and hematopoietic cancer, according to the results of the study presented by Leng at American Association for Cancer Research (AACR) Annual Meeting 2026.

Each 1 µg/m³ increase in the 36-month moving average of wildfire smoke PM_2.5 was associated with a 63% higher risk for hematopoietic cancer (HR, 1.63; 95% CI, 1.02-2.60), a nearly twofold higher risk for lung cancer (hazard ratio [HR], 1.92; 95% CI, 1.18-3.15), more than twofold higher risks for breast cancer (HR, 2.09; 95% CI, 1.34-3.26) and colorectal cancer (HR, 2.31; 95% CI, 1.11-4.81), and a more than threefold higher risk for bladder cancer (HR, 3.49; 95% CI, 1.66-7.34). No significant associations were observed for ovarian cancer or melanoma.

The investigators quantified wildfire smoke exposure at each participant’s residence on a monthly basis using three measures: near-ground wildfire smoke PM_2.5, wildfire smoke black carbon, and satellite-derived wildfire smoke plume-day counts, with measurements available from 2006 until first cancer diagnosis or last contact.

Given evidence that 3 years of air pollution exposure can influence the development of epidermal growth factor receptor-positive lung adenocarcinoma, the team modeled exposure as a time-varying variable using 36-month moving averages preceding each month. HRs were estimated using Cox proportional hazards models stratified by study center, with restricted cubic splines applied to evaluate dose-response relationships. Models were adjusted for age, sex, race and ethnicity, education, smoking history, BMI, and trial arm.

All five cancer types linked with wildfire smoke exposure showed linear dose-response relationships, Leng noted, “which means the higher the exposure, the higher the cancer risk.”

Results based on wildfire smoke plume-day counts were generally consistent with those for PM_2.5, while associations for black carbon exposure were observed only for breast and bladder cancers.

With wildfires on the rise, these findings suggest that the resulting smoke may become a “major driver for cancer burden in the US in the coming decades,” said Leng, of the University of New Mexico Comprehensive Cancer Center, Albuquerque, New Mexico.

“Wildfire smoke has become a major source of air pollution in the United States,” he continued. Large fires in the US are three times more common than they were 50 years ago, and the “tons of toxicants and particles” released by these fires “can travel hundreds of miles to affect communities far away.”

The investigators also conducted histology-specific analyses, finding that adenocarcinoma showed the strongest association with wildfire smoke among lung cancer subtypes. Among colorectal cancers, proximal tumors appeared more sensitive to wildfire smoke exposure, while among bladder cancers, the association was strongest for muscle-invasive disease.

Wildfire Smoke Exposure Expected to Rise

Under even the most conservative climate projections, wildfire smoke exposure in the US is expected to rise over the next 20-30 years, Leng said.

Annual average wildfire smoke PM_2.5 levels, currently estimated at around 0.5 µg/m³, could rise to 1 µg/m³. Based on the study’s dose-response data, this would correspond to substantially greater cancer risk.

There will be “a much larger area” of the US exposed “at a much higher dose,” Leng predicted.

Mitigating the Risks of Wildfire Smoke

This is a “strong hypothesis-generating study,” Jun Wu, PhD, professor of environmental and occupational health at the UC Irvine Program in Public Health, Irvine, California, told Medscape Medical News.

“This is one of the first large, prospective US cohort studies to examine wildfire smoke specifically in relation to cancer risk, especially cancer sites beyond the lung,” Wu said. “A major strength is that the PLCO platform has around 91,000 participants with longitudinal follow-up and detailed covariate data, including smoking history, which is often a weak point in previous air pollution-cancer studies.”

According to Wu, who was not involved in the analysis but recently published data linking wildfire smoke exposure to preterm birth, the reported risks for colorectal, breast, bladder, and hematopoietic cancers represent novel contributions to the literature. However, she cautioned against viewing the specific HRs as a precise estimates of risk due to wide confidence intervals.

The findings should encourage individuals, public health officials, and clinicians to mitigate the risks of wildfire smoke, Wu said.

Specifically, she suggested that public health assessments expand beyond acute outcomes like emergency department visits to include long-term endpoints such as cancer, while community clean-air shelters need to be made more widely available.

She advised clinicians to incorporate wildfire exposure into routine patient histories and to provide vulnerable patients — such as those with asthma, chronic obstructive pulmonary disease, heart failure, or pregnancy — with smoke-season action plans.

Risk mitigation begins with awareness, according to Wu, who advised individuals check their local air quality index on AirNow.gov or PurpleAir.

On smoky days, she suggested prioritizing indoor air quality by keeping windows closed and running air purifiers. If going outside on such days is necessary, she suggested an N95 or KN95 mask, as these offer “meaningful protection,” while cloth and surgical masks do not.

These preventive steps may have once been out of the ordinary, Wu said, but the risk for wildfire smoke exposure is becoming a part of everyday life.

“The common thread is a shift in framing,” Wu said. “Wildfire smoke has traditionally been treated as an acute event, but the emerging evidence points to a chronic environmental exposure. Both our clinical and public health systems have room to grow into that reality.”

The analysis was funded by the National Institutes of Health. The investigators and Wu reported having no conflicts of interest.

This article was previously published on Medscape.

Wildfire smoke exposure may be associated with increased risks for multiple types of cancer, suggests an analysis of prospective cohort data from over 90,000 individuals.

To determine how this widespread pollution might be affecting cancer risk, senior author Shuguang Leng, MBBS, PhD, and colleagues analyzed data from the Prostate, Lung, Colorectal, and Ovarian (PLCO) Cancer Screening Trial. That prospective national study enrolled approximately 154,000 participants between 1993 and 2001 and tracked cancer incidence through 2018. Of these, 91,460 participants had wildfire smoke exposure data and were included in the analysis.

During the 2006-2018 exposure period, the investigators identified incident cases of 242 ovarian, 800 colorectal, 896 bladder, 1696 hematopoietic, 1739 breast, and 1758 lung cancers, as well as 1127 melanoma cases. The median 36-month moving average for wildfire smoke PM_2.5 (fine particulate matter) across the cohort was 0.37 µg/m³.

Wildfire smoke exposure was significantly associated with increased risks for lung, colorectal, breast, bladder, and hematopoietic cancer, according to the results of the study presented by Leng at American Association for Cancer Research (AACR) Annual Meeting 2026.

Each 1 µg/m³ increase in the 36-month moving average of wildfire smoke PM_2.5 was associated with a 63% higher risk for hematopoietic cancer (HR, 1.63; 95% CI, 1.02-2.60), a nearly twofold higher risk for lung cancer (hazard ratio [HR], 1.92; 95% CI, 1.18-3.15), more than twofold higher risks for breast cancer (HR, 2.09; 95% CI, 1.34-3.26) and colorectal cancer (HR, 2.31; 95% CI, 1.11-4.81), and a more than threefold higher risk for bladder cancer (HR, 3.49; 95% CI, 1.66-7.34). No significant associations were observed for ovarian cancer or melanoma.

The investigators quantified wildfire smoke exposure at each participant’s residence on a monthly basis using three measures: near-ground wildfire smoke PM_2.5, wildfire smoke black carbon, and satellite-derived wildfire smoke plume-day counts, with measurements available from 2006 until first cancer diagnosis or last contact.

Given evidence that 3 years of air pollution exposure can influence the development of epidermal growth factor receptor-positive lung adenocarcinoma, the team modeled exposure as a time-varying variable using 36-month moving averages preceding each month. HRs were estimated using Cox proportional hazards models stratified by study center, with restricted cubic splines applied to evaluate dose-response relationships. Models were adjusted for age, sex, race and ethnicity, education, smoking history, BMI, and trial arm.

All five cancer types linked with wildfire smoke exposure showed linear dose-response relationships, Leng noted, “which means the higher the exposure, the higher the cancer risk.”

Results based on wildfire smoke plume-day counts were generally consistent with those for PM_2.5, while associations for black carbon exposure were observed only for breast and bladder cancers.

With wildfires on the rise, these findings suggest that the resulting smoke may become a “major driver for cancer burden in the US in the coming decades,” said Leng, of the University of New Mexico Comprehensive Cancer Center, Albuquerque, New Mexico.

“Wildfire smoke has become a major source of air pollution in the United States,” he continued. Large fires in the US are three times more common than they were 50 years ago, and the “tons of toxicants and particles” released by these fires “can travel hundreds of miles to affect communities far away.”

The investigators also conducted histology-specific analyses, finding that adenocarcinoma showed the strongest association with wildfire smoke among lung cancer subtypes. Among colorectal cancers, proximal tumors appeared more sensitive to wildfire smoke exposure, while among bladder cancers, the association was strongest for muscle-invasive disease.

Wildfire Smoke Exposure Expected to Rise

Under even the most conservative climate projections, wildfire smoke exposure in the US is expected to rise over the next 20-30 years, Leng said.

Annual average wildfire smoke PM_2.5 levels, currently estimated at around 0.5 µg/m³, could rise to 1 µg/m³. Based on the study’s dose-response data, this would correspond to substantially greater cancer risk.

There will be “a much larger area” of the US exposed “at a much higher dose,” Leng predicted.

Mitigating the Risks of Wildfire Smoke

This is a “strong hypothesis-generating study,” Jun Wu, PhD, professor of environmental and occupational health at the UC Irvine Program in Public Health, Irvine, California, told Medscape Medical News.

“This is one of the first large, prospective US cohort studies to examine wildfire smoke specifically in relation to cancer risk, especially cancer sites beyond the lung,” Wu said. “A major strength is that the PLCO platform has around 91,000 participants with longitudinal follow-up and detailed covariate data, including smoking history, which is often a weak point in previous air pollution-cancer studies.”

According to Wu, who was not involved in the analysis but recently published data linking wildfire smoke exposure to preterm birth, the reported risks for colorectal, breast, bladder, and hematopoietic cancers represent novel contributions to the literature. However, she cautioned against viewing the specific HRs as a precise estimates of risk due to wide confidence intervals.

The findings should encourage individuals, public health officials, and clinicians to mitigate the risks of wildfire smoke, Wu said.

Specifically, she suggested that public health assessments expand beyond acute outcomes like emergency department visits to include long-term endpoints such as cancer, while community clean-air shelters need to be made more widely available.

She advised clinicians to incorporate wildfire exposure into routine patient histories and to provide vulnerable patients — such as those with asthma, chronic obstructive pulmonary disease, heart failure, or pregnancy — with smoke-season action plans.

Risk mitigation begins with awareness, according to Wu, who advised individuals check their local air quality index on AirNow.gov or PurpleAir.

On smoky days, she suggested prioritizing indoor air quality by keeping windows closed and running air purifiers. If going outside on such days is necessary, she suggested an N95 or KN95 mask, as these offer “meaningful protection,” while cloth and surgical masks do not.

These preventive steps may have once been out of the ordinary, Wu said, but the risk for wildfire smoke exposure is becoming a part of everyday life.

“The common thread is a shift in framing,” Wu said. “Wildfire smoke has traditionally been treated as an acute event, but the emerging evidence points to a chronic environmental exposure. Both our clinical and public health systems have room to grow into that reality.”

The analysis was funded by the National Institutes of Health. The investigators and Wu reported having no conflicts of interest.

This article was previously published on Medscape.

While the incidence of lung cancer is decreasing in men, it continues to rise in women. With more than 19,000 new cases in France each year, lung cancer is now the third most commonly diagnosed cancer among women. This trend is also seen in other European countries but appears to be region-specific because other continents report a decline in incidence among women. Moreover, although overall prognosis remains better in the female population, the trend is worrying: Mortality associated with the disease is increasing in women, unlike in men with lung cancer. A session at the French-Language Pneumology Congress held from January 30 to February 1, 2026, in Lille, France, provided an opportunity to review the situation.

Efficacy and Toxicity

Lung tumors in women have a distinct tumor profile: Women have a higher proportion of adenocarcinomas than men and a higher frequency of somatic mutations (EGFR, BRAF, or HER2), including in nonsmokers. In addition, 65% of lung cancers in women are associated with smoking compared with 87% of those in men.

The role of estrogens is central because they interact directly with tumor growth signaling pathways. Moreover, “sex is the second leading factor of variability in drug pharmacokinetics after weight and accounts for 28% of anticancer drug kinetics,” emphasized Julien Mazières, pulmonologist, Toulouse University Hospital, Toulouse, France. Also involved in this equation are a higher body fat percentage, lower gastric acidity, and, above all, reduced renal and hepatic clearance.

As a result, exposure to drugs — represented by the area under the curve — is often greater in women and translates into not only improved progression-free survival with targeted therapies and chemotherapy but also increased toxicity. Carboplatin and paclitaxel are among the drugs whose kinetics are most affected by clearance. There are differences in clearance of more than 20% for these drugs in women vs men, though dosages are not systematically adjusted except for weight-based dosing. This vulnerability to adverse effects is particularly pronounced with targeted therapies, with more neuropsychiatric and gastrointestinal disorders. Data on the efficacy of immunotherapy in lung cancer by sex are contradictory. However, endocrine-related adverse effects and pneumonitis are more frequent in women, especially before menopause.

Women remain underrepresented in clinical trials, and sex-specific analyses of results are too rarely performed, which limits understanding of mechanisms and prevents tailoring management recommendations according to sex.

Impaired Quality of Life

Lung cancer most severely impairs physical functioning in women. “In the absence of sex-stratified studies, psycho-oncologists’ experience suggests that women have more cognitive disorders, anxiety, and depression associated with this disease. Its impact on quality of life is major, with deterioration of social relationships and reduced treatment adherence,” summarized Céline Mascaux, MD, PhD, pulmonologist, Strasbourg University Hospital, Strasbourg, France. Women also face social and family pressure — a mental burden that pushes them to “hold on” for their loved ones. Regarding sexual health, women with lung cancer who are sexually active often report dissatisfaction with the quality of their sexual relations because of fatigue, lack of energy, sadness, and shortness of breath, not to mention treatment-related sexual dysfunction. These problems are often not given sufficient attention by physicians.

Finally, fertility requires greater attention from the medical community: According to the VICAN study conducted by France’s National Health Insurance Fund, a discussion about fertility preservation did not take place at the time of cancer diagnosis for 60% of men and 67% of women of childbearing age. “In lung cancer specifically, the desire for children nevertheless exists in nearly 40% of patients of childbearing age,” regretted Jacques Cadranel, pulmonologist, Tenon Hospital, Paris, France. This desire does not appear to have influenced therapeutic strategy, and fertility preservation was ultimately proposed in only a third of cases and was carried out in only 3% of women compared with21% of men.

This story has been translated from Univadis France, part of the Medscape Professional Network.

A version of this story first appeared on Medscape.com

While the incidence of lung cancer is decreasing in men, it continues to rise in women. With more than 19,000 new cases in France each year, lung cancer is now the third most commonly diagnosed cancer among women. This trend is also seen in other European countries but appears to be region-specific because other continents report a decline in incidence among women. Moreover, although overall prognosis remains better in the female population, the trend is worrying: Mortality associated with the disease is increasing in women, unlike in men with lung cancer. A session at the French-Language Pneumology Congress held from January 30 to February 1, 2026, in Lille, France, provided an opportunity to review the situation.

Efficacy and Toxicity

Lung tumors in women have a distinct tumor profile: Women have a higher proportion of adenocarcinomas than men and a higher frequency of somatic mutations (EGFR, BRAF, or HER2), including in nonsmokers. In addition, 65% of lung cancers in women are associated with smoking compared with 87% of those in men.

The role of estrogens is central because they interact directly with tumor growth signaling pathways. Moreover, “sex is the second leading factor of variability in drug pharmacokinetics after weight and accounts for 28% of anticancer drug kinetics,” emphasized Julien Mazières, pulmonologist, Toulouse University Hospital, Toulouse, France. Also involved in this equation are a higher body fat percentage, lower gastric acidity, and, above all, reduced renal and hepatic clearance.

As a result, exposure to drugs — represented by the area under the curve — is often greater in women and translates into not only improved progression-free survival with targeted therapies and chemotherapy but also increased toxicity. Carboplatin and paclitaxel are among the drugs whose kinetics are most affected by clearance. There are differences in clearance of more than 20% for these drugs in women vs men, though dosages are not systematically adjusted except for weight-based dosing. This vulnerability to adverse effects is particularly pronounced with targeted therapies, with more neuropsychiatric and gastrointestinal disorders. Data on the efficacy of immunotherapy in lung cancer by sex are contradictory. However, endocrine-related adverse effects and pneumonitis are more frequent in women, especially before menopause.

Women remain underrepresented in clinical trials, and sex-specific analyses of results are too rarely performed, which limits understanding of mechanisms and prevents tailoring management recommendations according to sex.

Impaired Quality of Life

Lung cancer most severely impairs physical functioning in women. “In the absence of sex-stratified studies, psycho-oncologists’ experience suggests that women have more cognitive disorders, anxiety, and depression associated with this disease. Its impact on quality of life is major, with deterioration of social relationships and reduced treatment adherence,” summarized Céline Mascaux, MD, PhD, pulmonologist, Strasbourg University Hospital, Strasbourg, France. Women also face social and family pressure — a mental burden that pushes them to “hold on” for their loved ones. Regarding sexual health, women with lung cancer who are sexually active often report dissatisfaction with the quality of their sexual relations because of fatigue, lack of energy, sadness, and shortness of breath, not to mention treatment-related sexual dysfunction. These problems are often not given sufficient attention by physicians.

Finally, fertility requires greater attention from the medical community: According to the VICAN study conducted by France’s National Health Insurance Fund, a discussion about fertility preservation did not take place at the time of cancer diagnosis for 60% of men and 67% of women of childbearing age. “In lung cancer specifically, the desire for children nevertheless exists in nearly 40% of patients of childbearing age,” regretted Jacques Cadranel, pulmonologist, Tenon Hospital, Paris, France. This desire does not appear to have influenced therapeutic strategy, and fertility preservation was ultimately proposed in only a third of cases and was carried out in only 3% of women compared with21% of men.

This story has been translated from Univadis France, part of the Medscape Professional Network.

A version of this story first appeared on Medscape.com

While the incidence of lung cancer is decreasing in men, it continues to rise in women. With more than 19,000 new cases in France each year, lung cancer is now the third most commonly diagnosed cancer among women. This trend is also seen in other European countries but appears to be region-specific because other continents report a decline in incidence among women. Moreover, although overall prognosis remains better in the female population, the trend is worrying: Mortality associated with the disease is increasing in women, unlike in men with lung cancer. A session at the French-Language Pneumology Congress held from January 30 to February 1, 2026, in Lille, France, provided an opportunity to review the situation.

Efficacy and Toxicity

Lung tumors in women have a distinct tumor profile: Women have a higher proportion of adenocarcinomas than men and a higher frequency of somatic mutations (EGFR, BRAF, or HER2), including in nonsmokers. In addition, 65% of lung cancers in women are associated with smoking compared with 87% of those in men.

The role of estrogens is central because they interact directly with tumor growth signaling pathways. Moreover, “sex is the second leading factor of variability in drug pharmacokinetics after weight and accounts for 28% of anticancer drug kinetics,” emphasized Julien Mazières, pulmonologist, Toulouse University Hospital, Toulouse, France. Also involved in this equation are a higher body fat percentage, lower gastric acidity, and, above all, reduced renal and hepatic clearance.

As a result, exposure to drugs — represented by the area under the curve — is often greater in women and translates into not only improved progression-free survival with targeted therapies and chemotherapy but also increased toxicity. Carboplatin and paclitaxel are among the drugs whose kinetics are most affected by clearance. There are differences in clearance of more than 20% for these drugs in women vs men, though dosages are not systematically adjusted except for weight-based dosing. This vulnerability to adverse effects is particularly pronounced with targeted therapies, with more neuropsychiatric and gastrointestinal disorders. Data on the efficacy of immunotherapy in lung cancer by sex are contradictory. However, endocrine-related adverse effects and pneumonitis are more frequent in women, especially before menopause.

Women remain underrepresented in clinical trials, and sex-specific analyses of results are too rarely performed, which limits understanding of mechanisms and prevents tailoring management recommendations according to sex.

Impaired Quality of Life

Lung cancer most severely impairs physical functioning in women. “In the absence of sex-stratified studies, psycho-oncologists’ experience suggests that women have more cognitive disorders, anxiety, and depression associated with this disease. Its impact on quality of life is major, with deterioration of social relationships and reduced treatment adherence,” summarized Céline Mascaux, MD, PhD, pulmonologist, Strasbourg University Hospital, Strasbourg, France. Women also face social and family pressure — a mental burden that pushes them to “hold on” for their loved ones. Regarding sexual health, women with lung cancer who are sexually active often report dissatisfaction with the quality of their sexual relations because of fatigue, lack of energy, sadness, and shortness of breath, not to mention treatment-related sexual dysfunction. These problems are often not given sufficient attention by physicians.

Finally, fertility requires greater attention from the medical community: According to the VICAN study conducted by France’s National Health Insurance Fund, a discussion about fertility preservation did not take place at the time of cancer diagnosis for 60% of men and 67% of women of childbearing age. “In lung cancer specifically, the desire for children nevertheless exists in nearly 40% of patients of childbearing age,” regretted Jacques Cadranel, pulmonologist, Tenon Hospital, Paris, France. This desire does not appear to have influenced therapeutic strategy, and fertility preservation was ultimately proposed in only a third of cases and was carried out in only 3% of women compared with21% of men.

This story has been translated from Univadis France, part of the Medscape Professional Network.

A version of this story first appeared on Medscape.com

TOPLINE:

A history of tuberculosis (TB) and a history of chronic bronchitis were associated with an increased risk for lung cancer in individuals who had never smoked, whereas asthma had a positive, nonsignificant association overall and a significant association in women.

METHODOLOGY:

• Researchers conducted a systematic review and meta-analysis of clinical databases from inception to July 2025, to assess the association between asthma, TB, and/or chronic bronchitis and the risk for lung cancer among participants aged 18 years or older who had never smoked.
• They included data from 20 case-control studies involving 54,135 participants and five cohort studies involving 377,983 participants.
• The primary outcome was the risk for lung cancer among participants with a history of TB, asthma, or chronic bronchitis.
• Participants were labeled as “never smokers” if they were explicitly described in the manuscripts as having “never smoked” or reported smoking < 100 cigarettes in their lifetime.

TAKEAWAY:

• In case-control studies, TB (16 studies) and chronic bronchitis (9 studies) were significantly associated with an increased risk for lung cancer (odds ratio [OR], 1.76; P < .001 and OR, 1.36; P = .012, respectively).
• In four case-cohort studies, TB was associated with an increased but nonsignificant risk for lung cancer (hazard ratio, 1.64).
• Eleven case-control studies demonstrated a positive but nonsignificant association between asthma and the risk for lung cancer (OR, 1.34). However, a significant association emerged when analyses were limited to women (five studies; OR, 1.61; P < .01).

IN PRACTICE:

History of TB was especially associated with increased LC [lung cancer] risk, meriting particular attention for prospective CT screening studies,” the authors of the study wrote.

SOURCE:

This study was led by Nishwant Swami, MD, Hospital of the University of Pennsylvania, Philadelphia. It was published online on January 11, 2026, in Chest.

LIMITATIONS:

Most studies lacked uniform adjustment for key confounders, increasing the risk for residual confounding. The inclusion of few cohort studies in the analysis may have limited the assessment of temporality and precision. Additionally, differences in covariate adjustment, variable definitions, and language restrictions may have limited comparability and generalizability.

DISCLOSURES:

No specific funding was reported for this study. One author reported serving as a consultant or advisor for various companies, including AstraZeneca, Merck, and Pfizer. Another author reported receiving funding, in part, through the Prostate Cancer Foundation Young Investigator Award and through the Cancer Center Support Grant from the National Cancer Institute.

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 first appeared on Medscape.com.

TOPLINE:

A history of tuberculosis (TB) and a history of chronic bronchitis were associated with an increased risk for lung cancer in individuals who had never smoked, whereas asthma had a positive, nonsignificant association overall and a significant association in women.

METHODOLOGY:

• Researchers conducted a systematic review and meta-analysis of clinical databases from inception to July 2025, to assess the association between asthma, TB, and/or chronic bronchitis and the risk for lung cancer among participants aged 18 years or older who had never smoked.
• They included data from 20 case-control studies involving 54,135 participants and five cohort studies involving 377,983 participants.
• The primary outcome was the risk for lung cancer among participants with a history of TB, asthma, or chronic bronchitis.
• Participants were labeled as “never smokers” if they were explicitly described in the manuscripts as having “never smoked” or reported smoking < 100 cigarettes in their lifetime.

TAKEAWAY:

• In case-control studies, TB (16 studies) and chronic bronchitis (9 studies) were significantly associated with an increased risk for lung cancer (odds ratio [OR], 1.76; P < .001 and OR, 1.36; P = .012, respectively).
• In four case-cohort studies, TB was associated with an increased but nonsignificant risk for lung cancer (hazard ratio, 1.64).
• Eleven case-control studies demonstrated a positive but nonsignificant association between asthma and the risk for lung cancer (OR, 1.34). However, a significant association emerged when analyses were limited to women (five studies; OR, 1.61; P < .01).

IN PRACTICE:

History of TB was especially associated with increased LC [lung cancer] risk, meriting particular attention for prospective CT screening studies,” the authors of the study wrote.

SOURCE:

This study was led by Nishwant Swami, MD, Hospital of the University of Pennsylvania, Philadelphia. It was published online on January 11, 2026, in Chest.

LIMITATIONS:

Most studies lacked uniform adjustment for key confounders, increasing the risk for residual confounding. The inclusion of few cohort studies in the analysis may have limited the assessment of temporality and precision. Additionally, differences in covariate adjustment, variable definitions, and language restrictions may have limited comparability and generalizability.

DISCLOSURES:

No specific funding was reported for this study. One author reported serving as a consultant or advisor for various companies, including AstraZeneca, Merck, and Pfizer. Another author reported receiving funding, in part, through the Prostate Cancer Foundation Young Investigator Award and through the Cancer Center Support Grant from the National Cancer Institute.

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 first appeared on Medscape.com.

TOPLINE:

A history of tuberculosis (TB) and a history of chronic bronchitis were associated with an increased risk for lung cancer in individuals who had never smoked, whereas asthma had a positive, nonsignificant association overall and a significant association in women.

METHODOLOGY:

• Researchers conducted a systematic review and meta-analysis of clinical databases from inception to July 2025, to assess the association between asthma, TB, and/or chronic bronchitis and the risk for lung cancer among participants aged 18 years or older who had never smoked.
• They included data from 20 case-control studies involving 54,135 participants and five cohort studies involving 377,983 participants.
• The primary outcome was the risk for lung cancer among participants with a history of TB, asthma, or chronic bronchitis.
• Participants were labeled as “never smokers” if they were explicitly described in the manuscripts as having “never smoked” or reported smoking < 100 cigarettes in their lifetime.

TAKEAWAY:

• In case-control studies, TB (16 studies) and chronic bronchitis (9 studies) were significantly associated with an increased risk for lung cancer (odds ratio [OR], 1.76; P < .001 and OR, 1.36; P = .012, respectively).
• In four case-cohort studies, TB was associated with an increased but nonsignificant risk for lung cancer (hazard ratio, 1.64).
• Eleven case-control studies demonstrated a positive but nonsignificant association between asthma and the risk for lung cancer (OR, 1.34). However, a significant association emerged when analyses were limited to women (five studies; OR, 1.61; P < .01).

IN PRACTICE:

History of TB was especially associated with increased LC [lung cancer] risk, meriting particular attention for prospective CT screening studies,” the authors of the study wrote.

SOURCE:

This study was led by Nishwant Swami, MD, Hospital of the University of Pennsylvania, Philadelphia. It was published online on January 11, 2026, in Chest.

LIMITATIONS:

Most studies lacked uniform adjustment for key confounders, increasing the risk for residual confounding. The inclusion of few cohort studies in the analysis may have limited the assessment of temporality and precision. Additionally, differences in covariate adjustment, variable definitions, and language restrictions may have limited comparability and generalizability.

DISCLOSURES:

No specific funding was reported for this study. One author reported serving as a consultant or advisor for various companies, including AstraZeneca, Merck, and Pfizer. Another author reported receiving funding, in part, through the Prostate Cancer Foundation Young Investigator Award and through the Cancer Center Support Grant from the National Cancer Institute.

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 first appeared on Medscape.com.

TOPLINE:

A comprehensive review of 92 studies found that 15% to 20% of lung cancers occurred among nonsmokers and were associated with environmental and germline risk factors. These cancers frequently harbored actionable genomic drivers, and targeted EGFR and ALK therapies produced significant diseasefree survival (DFS) and overall survival benefits.

METHODOLOGY:

• Lung cancer continues to be the leading cause of cancer death worldwide, causing about 1.8 million deaths in 2022, with smoking remaining the predominant risk factor. However, the incidence of lung cancer among nonsmokers (those who have smoked less than 100 cigarettes in their lifetime) is rising, varies by sex and geography, and is linked to environmental exposures and family history. The misperception that lung cancer is almost invariably caused by smoking may delay assessment and diagnosis.
• Researchers conducted a review of 92 studies on lung cancer in nonsmokers: 6 meta-analyses or systematic reviews, 16 randomized clinical trials, eight prospective cohort studies, seven retrospective cohort studies, three cross-sectional studies, four observational or case-control studies, 13 genomic studies, and 35 other studies.
• Overall, lung cancer among nonsmokers accounted for 15% to 20% of all lung cancer cases. Most lung cancers in nonsmokers were adenocarcinomas (60% to 80%), with a median age at diagnosis of 67 years in this group compared with 70 years in people with a history of smoking.
• Data analysis from three US hospital networks showed that the proportion of lung cancer among nonsmokers increased from 8.0% to 14.9% between 1990 and 2013. A pooled analysis of seven Finnish cohorts reported an absolute increase in lung cancer among nonsmokers from 6.9 per 100,000 person-years in 1972 to 12.9 per 100,000 person-years in 2015.
• The age-adjusted incidence rate of lung cancer in the US between 2000 and 2013 was 17.5 per 100,000 individuals among Asian female nonsmokers compared with 10.1 per 100,000 among non-Hispanic White female nonsmokers.

TAKEAWAY:

• Environmental and occupational risk factors were secondhand smoke, residential radon, outdoor and household air pollution (PM_2.5), asbestos and silica exposure, and prior thoracic radiotherapy. Having a first-degree relative with lung cancer increased the risk of developing lung cancer, and genome-wide association studies identified susceptibility loci associated with lung cancer risk in nonsmokers.
• Family history and inherited susceptibility increased lung cancer risk in never smokers (odds ratio [OR] for lung cancer in those with a first–degree relative, 1.51), and clonal hematopoiesis was also associated with higher risk (OR, 1.43). Importantly, tumors in nonsmokers were frequently driven by actionable somatic alterations (EGFR mutations, 40% to 60% in nonsmokers compared with 10% in smokers) and enrichment of ALK/ROS1/RET/ERBB2/NTRK/NRG1 fusions; 78% to 92% of adenocarcinomas in nonsmokers harbored actionable drivers (compared with 49.5% in ever smokers), and nonsmokers had a substantially lower tumor mutational burden (10–fold lower).
• Similar to individuals with a history of smoking, nonsmokers with lung cancer presented with cough, pain, dyspnea, or weight loss or had disease detected incidentally. Surgical resection remained the preferred treatment for anatomically resectable lung cancer (stages I-III) in medically eligible patients, with follow-up CT screening recommended every 6 months for 2 to 3 years and then annually.
• Targeted adjuvant therapy substantially improved outcomes for resected EGFR–mutant or ALK–rearranged non-small cell lung cancer (NSCLC). Four-year DFS was increased to 70% with osimertinib compared with 29% with placebo (hazard ratio [HR], 0.23) and 5–year overall survival was increased to 85% compared with 73% (HR, 0.49). Two–year DFS was 93.8% with alectinib compared with 63% with placebo (HR, 0.24). In unresectable EGFR-mutated stage III NSCLC, median progression-free survival was 39.1 months with adjuvant osimertinib compared with 5.6 months with placebo. For resected ALKpositive disease, 2–year DFS was 93.8% with adjuvant alectinib compared with 63.0% with chemotherapy (HR, 0.24).
• However, singleagent single agent programmed cell death protein 1 inhibitors or programmed death-ligand 1 inhibitors demonstrated limited efficacy in EGFR or ALK–driven tumors, and benefit was attenuated in never smokers. Regarding screening and early detection, the US Preventive Services Task Force did not recommend lowdose CT screening for nonsmokers, whereas Taiwan implemented a biennial screening program for selected nonsmoking high–risk groups.

IN PRACTICE:

“Among patients with lung cancer, nonsmoking individuals are more likely to have genomic alterations, such as EGFR mutations or ALK gene rearrangements, and these patients have improved survival when treated with TKIs compared with chemotherapy,” the authors of the study wrote.

SOURCE:

The study, led by Cian Murphy, PhD, Cancer Evolution and Genome Instability Laboratory, Francis Crick Institute, London, England, was published online in JAMA.

LIMITATIONS:

Becausesmoking history was often not included in many databases, cancer registries, and trials, the incidence and prevalence of lung cancer in nonsmokers could not be accurately determined. Additionally, accurate quantification of environmental exposures, such as air pollution, presented significant challenges. The quality of the evidence was not formally evaluated, and some relevant articles may have been missed in the literature review.

DISCLOSURES:

The study received support from multiple organizations, including the Rosetrees Trust, Ruth Strauss Foundation, Cancer Research UK, and the National Health and Medical Research Council. Several authors reported receiving grants or personal fees from and having other ties with various sources. Full disclosures are noted in the original article.

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 first appeared on Medscape.com.

TOPLINE:

A comprehensive review of 92 studies found that 15% to 20% of lung cancers occurred among nonsmokers and were associated with environmental and germline risk factors. These cancers frequently harbored actionable genomic drivers, and targeted EGFR and ALK therapies produced significant diseasefree survival (DFS) and overall survival benefits.

METHODOLOGY:

• Lung cancer continues to be the leading cause of cancer death worldwide, causing about 1.8 million deaths in 2022, with smoking remaining the predominant risk factor. However, the incidence of lung cancer among nonsmokers (those who have smoked less than 100 cigarettes in their lifetime) is rising, varies by sex and geography, and is linked to environmental exposures and family history. The misperception that lung cancer is almost invariably caused by smoking may delay assessment and diagnosis.
• Researchers conducted a review of 92 studies on lung cancer in nonsmokers: 6 meta-analyses or systematic reviews, 16 randomized clinical trials, eight prospective cohort studies, seven retrospective cohort studies, three cross-sectional studies, four observational or case-control studies, 13 genomic studies, and 35 other studies.
• Overall, lung cancer among nonsmokers accounted for 15% to 20% of all lung cancer cases. Most lung cancers in nonsmokers were adenocarcinomas (60% to 80%), with a median age at diagnosis of 67 years in this group compared with 70 years in people with a history of smoking.
• Data analysis from three US hospital networks showed that the proportion of lung cancer among nonsmokers increased from 8.0% to 14.9% between 1990 and 2013. A pooled analysis of seven Finnish cohorts reported an absolute increase in lung cancer among nonsmokers from 6.9 per 100,000 person-years in 1972 to 12.9 per 100,000 person-years in 2015.
• The age-adjusted incidence rate of lung cancer in the US between 2000 and 2013 was 17.5 per 100,000 individuals among Asian female nonsmokers compared with 10.1 per 100,000 among non-Hispanic White female nonsmokers.

TAKEAWAY:

• Environmental and occupational risk factors were secondhand smoke, residential radon, outdoor and household air pollution (PM_2.5), asbestos and silica exposure, and prior thoracic radiotherapy. Having a first-degree relative with lung cancer increased the risk of developing lung cancer, and genome-wide association studies identified susceptibility loci associated with lung cancer risk in nonsmokers.
• Family history and inherited susceptibility increased lung cancer risk in never smokers (odds ratio [OR] for lung cancer in those with a first–degree relative, 1.51), and clonal hematopoiesis was also associated with higher risk (OR, 1.43). Importantly, tumors in nonsmokers were frequently driven by actionable somatic alterations (EGFR mutations, 40% to 60% in nonsmokers compared with 10% in smokers) and enrichment of ALK/ROS1/RET/ERBB2/NTRK/NRG1 fusions; 78% to 92% of adenocarcinomas in nonsmokers harbored actionable drivers (compared with 49.5% in ever smokers), and nonsmokers had a substantially lower tumor mutational burden (10–fold lower).
• Similar to individuals with a history of smoking, nonsmokers with lung cancer presented with cough, pain, dyspnea, or weight loss or had disease detected incidentally. Surgical resection remained the preferred treatment for anatomically resectable lung cancer (stages I-III) in medically eligible patients, with follow-up CT screening recommended every 6 months for 2 to 3 years and then annually.
• Targeted adjuvant therapy substantially improved outcomes for resected EGFR–mutant or ALK–rearranged non-small cell lung cancer (NSCLC). Four-year DFS was increased to 70% with osimertinib compared with 29% with placebo (hazard ratio [HR], 0.23) and 5–year overall survival was increased to 85% compared with 73% (HR, 0.49). Two–year DFS was 93.8% with alectinib compared with 63% with placebo (HR, 0.24). In unresectable EGFR-mutated stage III NSCLC, median progression-free survival was 39.1 months with adjuvant osimertinib compared with 5.6 months with placebo. For resected ALKpositive disease, 2–year DFS was 93.8% with adjuvant alectinib compared with 63.0% with chemotherapy (HR, 0.24).
• However, singleagent single agent programmed cell death protein 1 inhibitors or programmed death-ligand 1 inhibitors demonstrated limited efficacy in EGFR or ALK–driven tumors, and benefit was attenuated in never smokers. Regarding screening and early detection, the US Preventive Services Task Force did not recommend lowdose CT screening for nonsmokers, whereas Taiwan implemented a biennial screening program for selected nonsmoking high–risk groups.

IN PRACTICE:

“Among patients with lung cancer, nonsmoking individuals are more likely to have genomic alterations, such as EGFR mutations or ALK gene rearrangements, and these patients have improved survival when treated with TKIs compared with chemotherapy,” the authors of the study wrote.

SOURCE:

The study, led by Cian Murphy, PhD, Cancer Evolution and Genome Instability Laboratory, Francis Crick Institute, London, England, was published online in JAMA.

LIMITATIONS:

Becausesmoking history was often not included in many databases, cancer registries, and trials, the incidence and prevalence of lung cancer in nonsmokers could not be accurately determined. Additionally, accurate quantification of environmental exposures, such as air pollution, presented significant challenges. The quality of the evidence was not formally evaluated, and some relevant articles may have been missed in the literature review.

DISCLOSURES:

The study received support from multiple organizations, including the Rosetrees Trust, Ruth Strauss Foundation, Cancer Research UK, and the National Health and Medical Research Council. Several authors reported receiving grants or personal fees from and having other ties with various sources. Full disclosures are noted in the original article.

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 first appeared on Medscape.com.

TOPLINE:

A comprehensive review of 92 studies found that 15% to 20% of lung cancers occurred among nonsmokers and were associated with environmental and germline risk factors. These cancers frequently harbored actionable genomic drivers, and targeted EGFR and ALK therapies produced significant diseasefree survival (DFS) and overall survival benefits.

METHODOLOGY:

• Lung cancer continues to be the leading cause of cancer death worldwide, causing about 1.8 million deaths in 2022, with smoking remaining the predominant risk factor. However, the incidence of lung cancer among nonsmokers (those who have smoked less than 100 cigarettes in their lifetime) is rising, varies by sex and geography, and is linked to environmental exposures and family history. The misperception that lung cancer is almost invariably caused by smoking may delay assessment and diagnosis.
• Researchers conducted a review of 92 studies on lung cancer in nonsmokers: 6 meta-analyses or systematic reviews, 16 randomized clinical trials, eight prospective cohort studies, seven retrospective cohort studies, three cross-sectional studies, four observational or case-control studies, 13 genomic studies, and 35 other studies.
• Overall, lung cancer among nonsmokers accounted for 15% to 20% of all lung cancer cases. Most lung cancers in nonsmokers were adenocarcinomas (60% to 80%), with a median age at diagnosis of 67 years in this group compared with 70 years in people with a history of smoking.
• Data analysis from three US hospital networks showed that the proportion of lung cancer among nonsmokers increased from 8.0% to 14.9% between 1990 and 2013. A pooled analysis of seven Finnish cohorts reported an absolute increase in lung cancer among nonsmokers from 6.9 per 100,000 person-years in 1972 to 12.9 per 100,000 person-years in 2015.
• The age-adjusted incidence rate of lung cancer in the US between 2000 and 2013 was 17.5 per 100,000 individuals among Asian female nonsmokers compared with 10.1 per 100,000 among non-Hispanic White female nonsmokers.

TAKEAWAY:

• Environmental and occupational risk factors were secondhand smoke, residential radon, outdoor and household air pollution (PM_2.5), asbestos and silica exposure, and prior thoracic radiotherapy. Having a first-degree relative with lung cancer increased the risk of developing lung cancer, and genome-wide association studies identified susceptibility loci associated with lung cancer risk in nonsmokers.
• Family history and inherited susceptibility increased lung cancer risk in never smokers (odds ratio [OR] for lung cancer in those with a first–degree relative, 1.51), and clonal hematopoiesis was also associated with higher risk (OR, 1.43). Importantly, tumors in nonsmokers were frequently driven by actionable somatic alterations (EGFR mutations, 40% to 60% in nonsmokers compared with 10% in smokers) and enrichment of ALK/ROS1/RET/ERBB2/NTRK/NRG1 fusions; 78% to 92% of adenocarcinomas in nonsmokers harbored actionable drivers (compared with 49.5% in ever smokers), and nonsmokers had a substantially lower tumor mutational burden (10–fold lower).
• Similar to individuals with a history of smoking, nonsmokers with lung cancer presented with cough, pain, dyspnea, or weight loss or had disease detected incidentally. Surgical resection remained the preferred treatment for anatomically resectable lung cancer (stages I-III) in medically eligible patients, with follow-up CT screening recommended every 6 months for 2 to 3 years and then annually.
• Targeted adjuvant therapy substantially improved outcomes for resected EGFR–mutant or ALK–rearranged non-small cell lung cancer (NSCLC). Four-year DFS was increased to 70% with osimertinib compared with 29% with placebo (hazard ratio [HR], 0.23) and 5–year overall survival was increased to 85% compared with 73% (HR, 0.49). Two–year DFS was 93.8% with alectinib compared with 63% with placebo (HR, 0.24). In unresectable EGFR-mutated stage III NSCLC, median progression-free survival was 39.1 months with adjuvant osimertinib compared with 5.6 months with placebo. For resected ALKpositive disease, 2–year DFS was 93.8% with adjuvant alectinib compared with 63.0% with chemotherapy (HR, 0.24).
• However, singleagent single agent programmed cell death protein 1 inhibitors or programmed death-ligand 1 inhibitors demonstrated limited efficacy in EGFR or ALK–driven tumors, and benefit was attenuated in never smokers. Regarding screening and early detection, the US Preventive Services Task Force did not recommend lowdose CT screening for nonsmokers, whereas Taiwan implemented a biennial screening program for selected nonsmoking high–risk groups.

IN PRACTICE:

“Among patients with lung cancer, nonsmoking individuals are more likely to have genomic alterations, such as EGFR mutations or ALK gene rearrangements, and these patients have improved survival when treated with TKIs compared with chemotherapy,” the authors of the study wrote.

SOURCE:

The study, led by Cian Murphy, PhD, Cancer Evolution and Genome Instability Laboratory, Francis Crick Institute, London, England, was published online in JAMA.

LIMITATIONS:

Becausesmoking history was often not included in many databases, cancer registries, and trials, the incidence and prevalence of lung cancer in nonsmokers could not be accurately determined. Additionally, accurate quantification of environmental exposures, such as air pollution, presented significant challenges. The quality of the evidence was not formally evaluated, and some relevant articles may have been missed in the literature review.

DISCLOSURES:

The study received support from multiple organizations, including the Rosetrees Trust, Ruth Strauss Foundation, Cancer Research UK, and the National Health and Medical Research Council. Several authors reported receiving grants or personal fees from and having other ties with various sources. Full disclosures are noted in the original article.

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 first appeared on Medscape.com.

TOPLINE:

Compared with inactive patterns, weekend warrior (moderate-to-vigorous physical activity [MVPA] condensed into 1-2 days per week) and regular physical activity patterns were found to be equally effective at reducing the risk for lung cancer. Neither pattern showed significant associations with the overall risk for cancer or specific risks for prostate, breast, and colorectal cancers.

METHODOLOGY:

• This analysis included 80,896 participants (mean age, 55.5 years; 56% women) with valid accelerometer data collected between June 2013 and December 2015.
• Participants were classified into three groups: 32,213 active weekend warriors (≥ 150 minutes of weekly MVPA with ≥ 50% achieved in 1-2 days), 22,162 active regular participants (≥ 150 minutes of MVPA but not meeting a weekend warrior pattern), and 26,521 inactive participants (< 150 minutes of MVPA).
• Researchers tracked associations between physical activity patterns and incident cases of all types of cancer plus specific cases of prostate, breast, colorectal, and lung cancer over a median follow-up duration of 6 years.

TAKEAWAY:

• Compared with inactive patterns, active weekend warrior patterns showed a significant inverse association with the risk for lung cancer (hazard ratio [HR], 0.77; 95% CI, 0.61-0.98).
• Active regular activity patterns demonstrated similar protective effects against lung cancer as inactive patterns (HR, 0.73; 95% CI, 0.56-0.96).
• Neither of the physical activity patterns showed any significant association with the overall risk for cancer or specific risks for prostate, breast, and colorectal cancers.

IN PRACTICE:

"Physical activity condensed into one to two days per week compared with a more balanced weekly distribution was associated with similar risk reductions of incident lung cancer, while neither pattern was associated with reduced overall, prostate, breast, and colorectal cancers," the authors of the study wrote.

SOURCE:

This study was led by Rubén López-Bueno, Department of Physical Medicine and Nursing, University of Zaragoza, Zaragoza, Spain. It was published online on September 06, 2025, in Annals of Medicine.

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

TOPLINE:

Compared with inactive patterns, weekend warrior (moderate-to-vigorous physical activity [MVPA] condensed into 1-2 days per week) and regular physical activity patterns were found to be equally effective at reducing the risk for lung cancer. Neither pattern showed significant associations with the overall risk for cancer or specific risks for prostate, breast, and colorectal cancers.

METHODOLOGY:

• This analysis included 80,896 participants (mean age, 55.5 years; 56% women) with valid accelerometer data collected between June 2013 and December 2015.
• Participants were classified into three groups: 32,213 active weekend warriors (≥ 150 minutes of weekly MVPA with ≥ 50% achieved in 1-2 days), 22,162 active regular participants (≥ 150 minutes of MVPA but not meeting a weekend warrior pattern), and 26,521 inactive participants (< 150 minutes of MVPA).
• Researchers tracked associations between physical activity patterns and incident cases of all types of cancer plus specific cases of prostate, breast, colorectal, and lung cancer over a median follow-up duration of 6 years.

TAKEAWAY:

• Compared with inactive patterns, active weekend warrior patterns showed a significant inverse association with the risk for lung cancer (hazard ratio [HR], 0.77; 95% CI, 0.61-0.98).
• Active regular activity patterns demonstrated similar protective effects against lung cancer as inactive patterns (HR, 0.73; 95% CI, 0.56-0.96).
• Neither of the physical activity patterns showed any significant association with the overall risk for cancer or specific risks for prostate, breast, and colorectal cancers.

IN PRACTICE:

"Physical activity condensed into one to two days per week compared with a more balanced weekly distribution was associated with similar risk reductions of incident lung cancer, while neither pattern was associated with reduced overall, prostate, breast, and colorectal cancers," the authors of the study wrote.

SOURCE:

This study was led by Rubén López-Bueno, Department of Physical Medicine and Nursing, University of Zaragoza, Zaragoza, Spain. It was published online on September 06, 2025, in Annals of Medicine.

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

TOPLINE:

Compared with inactive patterns, weekend warrior (moderate-to-vigorous physical activity [MVPA] condensed into 1-2 days per week) and regular physical activity patterns were found to be equally effective at reducing the risk for lung cancer. Neither pattern showed significant associations with the overall risk for cancer or specific risks for prostate, breast, and colorectal cancers.

METHODOLOGY:

• This analysis included 80,896 participants (mean age, 55.5 years; 56% women) with valid accelerometer data collected between June 2013 and December 2015.
• Participants were classified into three groups: 32,213 active weekend warriors (≥ 150 minutes of weekly MVPA with ≥ 50% achieved in 1-2 days), 22,162 active regular participants (≥ 150 minutes of MVPA but not meeting a weekend warrior pattern), and 26,521 inactive participants (< 150 minutes of MVPA).
• Researchers tracked associations between physical activity patterns and incident cases of all types of cancer plus specific cases of prostate, breast, colorectal, and lung cancer over a median follow-up duration of 6 years.

TAKEAWAY:

• Compared with inactive patterns, active weekend warrior patterns showed a significant inverse association with the risk for lung cancer (hazard ratio [HR], 0.77; 95% CI, 0.61-0.98).
• Active regular activity patterns demonstrated similar protective effects against lung cancer as inactive patterns (HR, 0.73; 95% CI, 0.56-0.96).
• Neither of the physical activity patterns showed any significant association with the overall risk for cancer or specific risks for prostate, breast, and colorectal cancers.

IN PRACTICE:

"Physical activity condensed into one to two days per week compared with a more balanced weekly distribution was associated with similar risk reductions of incident lung cancer, while neither pattern was associated with reduced overall, prostate, breast, and colorectal cancers," the authors of the study wrote.

SOURCE:

This study was led by Rubén López-Bueno, Department of Physical Medicine and Nursing, University of Zaragoza, Zaragoza, Spain. It was published online on September 06, 2025, in Annals of Medicine.

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

Background

Patients diagnosed with lung cancer are predominantly non-small cell lung cancer (NSCLC), a leading cause of cancer-related deaths. Thus, it is imperative to investigate and distinguish the differences present at diagnosis to possibly improve survival outcomes. NSCLC commonly metastasizes within older patients near the mean age of 71 years, but also in early onset patients which represents the patients younger than the earliest lung cancer screening age of 50.

Objective

To reveal differences in ratios of metastasis locations in squamous cell carcinoma (SCC), adenocarcinoma (ACC), and adenosquamous carcinoma (ASC).

Methods

The National Cancer Database (NCDB) was utilized to identify patients diagnosed with SCC, ACC, and ASC using the histology codes 8070, 8140, and 8560 from the ICD-O-3.2 from 2004 to 2022. Age groups were 70 years. Metastases located to the brain, liver, bone, and lung were included. Chi-Square tests were performed. The data was analyzed using R version 4.4.2 and statistical significance was set to α = 0.05.

Results

In this study, 1,445,119 patients were analyzed. Chi-Square tests identified significant differences in the ratios of organ metastasis locations between age groups in each subtype (p < 0.001). SCC in each age group similarly metastasized most to bone (36.3%, 34.7%, 34.5%), but notably more local lung metastasis was observed in the oldest group (33.6%). In ACC and ASC, the oldest group also had greater ratios of spread within the lungs (28.0%, 27.2%). Overall, the younger the age group, distant spread to the brain increased (ex. 29.0%, 24.4%, 17.5%). This suggests a widely heterogenous distribution of metastases at diagnosis of NSCLC subtypes and patient age.

Conclusions

This study demonstrated that patients with SCC, ACC, or ASC subtypes of NSCLC share similar predominant locations based in part on patient age, irrespective of cancer origin. NSCLC may more distantly metastasize in younger patients to the brain, while older patients may have locally metastatic cancer. Further analysis of key demographic variables as well as common undertaken treatment options may prove informative and reveal existing differences in survival outcomes.

Background

Patients diagnosed with lung cancer are predominantly non-small cell lung cancer (NSCLC), a leading cause of cancer-related deaths. Thus, it is imperative to investigate and distinguish the differences present at diagnosis to possibly improve survival outcomes. NSCLC commonly metastasizes within older patients near the mean age of 71 years, but also in early onset patients which represents the patients younger than the earliest lung cancer screening age of 50.

Objective

To reveal differences in ratios of metastasis locations in squamous cell carcinoma (SCC), adenocarcinoma (ACC), and adenosquamous carcinoma (ASC).

Methods

The National Cancer Database (NCDB) was utilized to identify patients diagnosed with SCC, ACC, and ASC using the histology codes 8070, 8140, and 8560 from the ICD-O-3.2 from 2004 to 2022. Age groups were 70 years. Metastases located to the brain, liver, bone, and lung were included. Chi-Square tests were performed. The data was analyzed using R version 4.4.2 and statistical significance was set to α = 0.05.

Results

In this study, 1,445,119 patients were analyzed. Chi-Square tests identified significant differences in the ratios of organ metastasis locations between age groups in each subtype (p < 0.001). SCC in each age group similarly metastasized most to bone (36.3%, 34.7%, 34.5%), but notably more local lung metastasis was observed in the oldest group (33.6%). In ACC and ASC, the oldest group also had greater ratios of spread within the lungs (28.0%, 27.2%). Overall, the younger the age group, distant spread to the brain increased (ex. 29.0%, 24.4%, 17.5%). This suggests a widely heterogenous distribution of metastases at diagnosis of NSCLC subtypes and patient age.

Conclusions

This study demonstrated that patients with SCC, ACC, or ASC subtypes of NSCLC share similar predominant locations based in part on patient age, irrespective of cancer origin. NSCLC may more distantly metastasize in younger patients to the brain, while older patients may have locally metastatic cancer. Further analysis of key demographic variables as well as common undertaken treatment options may prove informative and reveal existing differences in survival outcomes.

Background

Patients diagnosed with lung cancer are predominantly non-small cell lung cancer (NSCLC), a leading cause of cancer-related deaths. Thus, it is imperative to investigate and distinguish the differences present at diagnosis to possibly improve survival outcomes. NSCLC commonly metastasizes within older patients near the mean age of 71 years, but also in early onset patients which represents the patients younger than the earliest lung cancer screening age of 50.

Objective

To reveal differences in ratios of metastasis locations in squamous cell carcinoma (SCC), adenocarcinoma (ACC), and adenosquamous carcinoma (ASC).

Methods

The National Cancer Database (NCDB) was utilized to identify patients diagnosed with SCC, ACC, and ASC using the histology codes 8070, 8140, and 8560 from the ICD-O-3.2 from 2004 to 2022. Age groups were 70 years. Metastases located to the brain, liver, bone, and lung were included. Chi-Square tests were performed. The data was analyzed using R version 4.4.2 and statistical significance was set to α = 0.05.

Results

In this study, 1,445,119 patients were analyzed. Chi-Square tests identified significant differences in the ratios of organ metastasis locations between age groups in each subtype (p < 0.001). SCC in each age group similarly metastasized most to bone (36.3%, 34.7%, 34.5%), but notably more local lung metastasis was observed in the oldest group (33.6%). In ACC and ASC, the oldest group also had greater ratios of spread within the lungs (28.0%, 27.2%). Overall, the younger the age group, distant spread to the brain increased (ex. 29.0%, 24.4%, 17.5%). This suggests a widely heterogenous distribution of metastases at diagnosis of NSCLC subtypes and patient age.

Conclusions

This study demonstrated that patients with SCC, ACC, or ASC subtypes of NSCLC share similar predominant locations based in part on patient age, irrespective of cancer origin. NSCLC may more distantly metastasize in younger patients to the brain, while older patients may have locally metastatic cancer. Further analysis of key demographic variables as well as common undertaken treatment options may prove informative and reveal existing differences in survival outcomes.

Background

Immune checkpoint inhibitors, including pembrolizumab, are associated with a spectrum of immune-related adverse events (irAEs), including immune- mediated hepatitis. Typically, this toxicity manifests within the first 14 weeks of therapy. Delayed presentations beyond one year are exceedingly rare and pose diagnostic challenges.

Case Presentation

We report an elderly patient (over 90 years old) with stage IVa squamous cell carcinoma of the lung and high microsatellite instability (MSI) who had been receiving pembrolizumab since 2023. In 2024—13 months into therapy—he presented with subjective fevers, weakness, and altered mental status. Laboratory evaluation revealed cholestatic jaundice with AST 310 U/L, ALT 291 U/L, alkaline phosphatase 860 U/L, and total bilirubin 5.7 mg/dL. Infectious workup was negative. Imaging via MRCP showed multiple scattered hepatic cysts and a small pancreatic cyst, without biliary obstruction.

Further evaluation, including serologies for hepatitis B and C, CMV, HSV, autoimmune hepatitis panel, iron studies, and ceruloplasmin, was unremarkable except for mildly elevated alpha-1 antitrypsin. Scattered liver cysts were seen on an MRI. The overall findings were most consistent with immune-related hepatitis, as pembrolizumab is known to cause both hepatocellular and cholestatic patterns of liver injury.

The patient was started on high-dose prednisone, resulting in rapid clinical and biochemical improvement. Two weeks post-discharge, liver function tests (LFTs) had markedly improved (bilirubin 1.3, AST 19, ALT 40, ALP 193). Given the severity of transaminitis and hyperbilirubinemia (AST >8x ULN, bilirubin >3x ULN), pembrolizumab was permanently discontinued. LFTs normalized after completion of the steroid taper.

Conclusions

This case highlights a rare instance of delayed immune-related hepatitis occurring over a year after initiation of pembrolizumab, far beyond the typical window of onset. Clinicians should maintain a high index of suspicion for irAEs even in late stages of immunotherapy, particularly when common etiologies are excluded. Prompt recognition and corticosteroid treatment can lead to favorable outcomes, even in older patients.

Background

Immune checkpoint inhibitors, including pembrolizumab, are associated with a spectrum of immune-related adverse events (irAEs), including immune- mediated hepatitis. Typically, this toxicity manifests within the first 14 weeks of therapy. Delayed presentations beyond one year are exceedingly rare and pose diagnostic challenges.

Case Presentation

We report an elderly patient (over 90 years old) with stage IVa squamous cell carcinoma of the lung and high microsatellite instability (MSI) who had been receiving pembrolizumab since 2023. In 2024—13 months into therapy—he presented with subjective fevers, weakness, and altered mental status. Laboratory evaluation revealed cholestatic jaundice with AST 310 U/L, ALT 291 U/L, alkaline phosphatase 860 U/L, and total bilirubin 5.7 mg/dL. Infectious workup was negative. Imaging via MRCP showed multiple scattered hepatic cysts and a small pancreatic cyst, without biliary obstruction.

Further evaluation, including serologies for hepatitis B and C, CMV, HSV, autoimmune hepatitis panel, iron studies, and ceruloplasmin, was unremarkable except for mildly elevated alpha-1 antitrypsin. Scattered liver cysts were seen on an MRI. The overall findings were most consistent with immune-related hepatitis, as pembrolizumab is known to cause both hepatocellular and cholestatic patterns of liver injury.

The patient was started on high-dose prednisone, resulting in rapid clinical and biochemical improvement. Two weeks post-discharge, liver function tests (LFTs) had markedly improved (bilirubin 1.3, AST 19, ALT 40, ALP 193). Given the severity of transaminitis and hyperbilirubinemia (AST >8x ULN, bilirubin >3x ULN), pembrolizumab was permanently discontinued. LFTs normalized after completion of the steroid taper.

Conclusions

This case highlights a rare instance of delayed immune-related hepatitis occurring over a year after initiation of pembrolizumab, far beyond the typical window of onset. Clinicians should maintain a high index of suspicion for irAEs even in late stages of immunotherapy, particularly when common etiologies are excluded. Prompt recognition and corticosteroid treatment can lead to favorable outcomes, even in older patients.

Background

Immune checkpoint inhibitors, including pembrolizumab, are associated with a spectrum of immune-related adverse events (irAEs), including immune- mediated hepatitis. Typically, this toxicity manifests within the first 14 weeks of therapy. Delayed presentations beyond one year are exceedingly rare and pose diagnostic challenges.

Case Presentation

We report an elderly patient (over 90 years old) with stage IVa squamous cell carcinoma of the lung and high microsatellite instability (MSI) who had been receiving pembrolizumab since 2023. In 2024—13 months into therapy—he presented with subjective fevers, weakness, and altered mental status. Laboratory evaluation revealed cholestatic jaundice with AST 310 U/L, ALT 291 U/L, alkaline phosphatase 860 U/L, and total bilirubin 5.7 mg/dL. Infectious workup was negative. Imaging via MRCP showed multiple scattered hepatic cysts and a small pancreatic cyst, without biliary obstruction.

Further evaluation, including serologies for hepatitis B and C, CMV, HSV, autoimmune hepatitis panel, iron studies, and ceruloplasmin, was unremarkable except for mildly elevated alpha-1 antitrypsin. Scattered liver cysts were seen on an MRI. The overall findings were most consistent with immune-related hepatitis, as pembrolizumab is known to cause both hepatocellular and cholestatic patterns of liver injury.

The patient was started on high-dose prednisone, resulting in rapid clinical and biochemical improvement. Two weeks post-discharge, liver function tests (LFTs) had markedly improved (bilirubin 1.3, AST 19, ALT 40, ALP 193). Given the severity of transaminitis and hyperbilirubinemia (AST >8x ULN, bilirubin >3x ULN), pembrolizumab was permanently discontinued. LFTs normalized after completion of the steroid taper.

Conclusions

This case highlights a rare instance of delayed immune-related hepatitis occurring over a year after initiation of pembrolizumab, far beyond the typical window of onset. Clinicians should maintain a high index of suspicion for irAEs even in late stages of immunotherapy, particularly when common etiologies are excluded. Prompt recognition and corticosteroid treatment can lead to favorable outcomes, even in older patients.

Background

Immune related adverse events (irAE) are a well-known complication in the treatment of nonsmall cell lung cancer (NSCLCA) with checkpoint inhibitors and have been shown to improve overall survival (OS) and progression free survival (PFS) across multiple studies. However, studies have shown that the prognosis of NSCLCA differs depending on the type of immune related adverse event and the grade of the irAE. For instance, patients who experienced endocrine irAEs like thyroid, or adrenal insufficiency tended to have an improved OS and PFS, whereas patients who developed pneumonitis that required discontinuation of checkpoint inhibitors had worse OS and PFS. While the literature describes the prognostic impacts of irAEs on NSCLCA, there is still a dearth of information on the implications of HLA supertypes on the prognosis of NSCLCA following irAEs.

Case Presentation

To address this point and to ask a question, we would like to share the case of a patient with a 10-year history of inflammatory arthropathy related to HLA-B27 antigen prior to his diagnosis of T2bN2M1b adenosquamous lung cancer with liver metastases. The tumor was 100% PD-L1 expressive and the patient was treated with pembrolizumab. The patient developed central adrenal insufficiency 10 months after pembrolizumab was initiated which was treated with physiologic dosing of hydrocortisone. The patient later developed a grade 3 pneumonitis 62 months after initiation of pembrolizumab and was treated with systemic glucocorticoids. Due to recurrent hospitalizations for pneumonitis, pembrolizumab was discontinued at 70 months post initiation. At the time of discontinuation PET was positive. However, there was a decrease in hyperactivity of the primary tumor at 4 months post discontinuation of pembrolizumab and there have been serial negative PETS from 7 months to 13 months post discontinuation. This led us to ask the question of whether HLA-B27 is protective of the poor prognostic immune related pneumonitis in this patient?

Background

Immune related adverse events (irAE) are a well-known complication in the treatment of nonsmall cell lung cancer (NSCLCA) with checkpoint inhibitors and have been shown to improve overall survival (OS) and progression free survival (PFS) across multiple studies. However, studies have shown that the prognosis of NSCLCA differs depending on the type of immune related adverse event and the grade of the irAE. For instance, patients who experienced endocrine irAEs like thyroid, or adrenal insufficiency tended to have an improved OS and PFS, whereas patients who developed pneumonitis that required discontinuation of checkpoint inhibitors had worse OS and PFS. While the literature describes the prognostic impacts of irAEs on NSCLCA, there is still a dearth of information on the implications of HLA supertypes on the prognosis of NSCLCA following irAEs.

Case Presentation

To address this point and to ask a question, we would like to share the case of a patient with a 10-year history of inflammatory arthropathy related to HLA-B27 antigen prior to his diagnosis of T2bN2M1b adenosquamous lung cancer with liver metastases. The tumor was 100% PD-L1 expressive and the patient was treated with pembrolizumab. The patient developed central adrenal insufficiency 10 months after pembrolizumab was initiated which was treated with physiologic dosing of hydrocortisone. The patient later developed a grade 3 pneumonitis 62 months after initiation of pembrolizumab and was treated with systemic glucocorticoids. Due to recurrent hospitalizations for pneumonitis, pembrolizumab was discontinued at 70 months post initiation. At the time of discontinuation PET was positive. However, there was a decrease in hyperactivity of the primary tumor at 4 months post discontinuation of pembrolizumab and there have been serial negative PETS from 7 months to 13 months post discontinuation. This led us to ask the question of whether HLA-B27 is protective of the poor prognostic immune related pneumonitis in this patient?

Background

Immune related adverse events (irAE) are a well-known complication in the treatment of nonsmall cell lung cancer (NSCLCA) with checkpoint inhibitors and have been shown to improve overall survival (OS) and progression free survival (PFS) across multiple studies. However, studies have shown that the prognosis of NSCLCA differs depending on the type of immune related adverse event and the grade of the irAE. For instance, patients who experienced endocrine irAEs like thyroid, or adrenal insufficiency tended to have an improved OS and PFS, whereas patients who developed pneumonitis that required discontinuation of checkpoint inhibitors had worse OS and PFS. While the literature describes the prognostic impacts of irAEs on NSCLCA, there is still a dearth of information on the implications of HLA supertypes on the prognosis of NSCLCA following irAEs.

Case Presentation

To address this point and to ask a question, we would like to share the case of a patient with a 10-year history of inflammatory arthropathy related to HLA-B27 antigen prior to his diagnosis of T2bN2M1b adenosquamous lung cancer with liver metastases. The tumor was 100% PD-L1 expressive and the patient was treated with pembrolizumab. The patient developed central adrenal insufficiency 10 months after pembrolizumab was initiated which was treated with physiologic dosing of hydrocortisone. The patient later developed a grade 3 pneumonitis 62 months after initiation of pembrolizumab and was treated with systemic glucocorticoids. Due to recurrent hospitalizations for pneumonitis, pembrolizumab was discontinued at 70 months post initiation. At the time of discontinuation PET was positive. However, there was a decrease in hyperactivity of the primary tumor at 4 months post discontinuation of pembrolizumab and there have been serial negative PETS from 7 months to 13 months post discontinuation. This led us to ask the question of whether HLA-B27 is protective of the poor prognostic immune related pneumonitis in this patient?

Background

Pulmonary large-cell neuroendocrine carcinoma (LCNEC) is a rare, aggressive lung cancer subtype, comprising ~3% of lung malignancies. It commonly affects older, heavy smokers and presents at an advanced stage. Prognosis is poor, with a 5-year survival rate of 15–25% in metastatic disease.

Case Presentation

A 33-year-old previously healthy male presented with a month of abdominal and lower back pain, along with significant weight loss. Lab tests revealed elevated lipase (378), and he was initially treated for acute pancreatitis. Imaging revealed a 1.9 cm pancreatic head mass and three hypodense hepatic lesions. MRI confirmed these findings but remained inconclusive. An incidental 8 mm right lower lobe pulmonary nodule led to chest CT, identifying a dominant left lower lobe mass and mediastinal lymphadenopathy, raising suspicion for primary lung malignancy. The patient was discharged but returned three days later with worsening symptoms and a lipase of 754. Endoscopic biopsy of the pancreatic mass was deferred due to ongoing pancreatitis. A liver biopsy revealed neuroendocrine differentiation, positive for CK AE1/AE3, CK7, CK19, and synaptophysin. Molecular profiling showed PD-L1 (TPS 50%), low tumor mutational burden, microsatellite stability, and high loss of heterozygosity. Bronchoscopy revealed a left hilar mass, and lymph node biopsy confirmed LCNEC (CK7+, chromogranin+, TTF- 1+, synaptophysin+), establishing a diagnosis of stage IV pulmonary LCNEC with pancreatic and liver metastases. The patient began treatment with bevacizumab, paclitaxel, carboplatin, and atezolizumab, resulting in improvement in hilar, hepatic, and pancreatic lesions on further imagings. The patient was continued on chemoimmunotherapy.

Discussion

This case highlights an uncommon presentation of LCNEC in a young, non-smoking male, initially manifesting as pancreatitis due to pancreatic metastasis. The absence of pulmonary symptoms complicated the diagnosis. Histopathology and immunohistochemistry were essential. While no standardized treatment exists for LCNEC, platinum-based chemotherapy with immunotherapy remains the mainstay. PD-L1 expression may guide immunotherapy decisions.

Conclusions

Pulmonary LCNEC should be considered in metastatic neuroendocrine tumors, even in young, non-smoking patients without pulmonary symptoms. Early tissue diagnosis and molecular profiling are key to guiding management.

Background

Pulmonary large-cell neuroendocrine carcinoma (LCNEC) is a rare, aggressive lung cancer subtype, comprising ~3% of lung malignancies. It commonly affects older, heavy smokers and presents at an advanced stage. Prognosis is poor, with a 5-year survival rate of 15–25% in metastatic disease.

Case Presentation

A 33-year-old previously healthy male presented with a month of abdominal and lower back pain, along with significant weight loss. Lab tests revealed elevated lipase (378), and he was initially treated for acute pancreatitis. Imaging revealed a 1.9 cm pancreatic head mass and three hypodense hepatic lesions. MRI confirmed these findings but remained inconclusive. An incidental 8 mm right lower lobe pulmonary nodule led to chest CT, identifying a dominant left lower lobe mass and mediastinal lymphadenopathy, raising suspicion for primary lung malignancy. The patient was discharged but returned three days later with worsening symptoms and a lipase of 754. Endoscopic biopsy of the pancreatic mass was deferred due to ongoing pancreatitis. A liver biopsy revealed neuroendocrine differentiation, positive for CK AE1/AE3, CK7, CK19, and synaptophysin. Molecular profiling showed PD-L1 (TPS 50%), low tumor mutational burden, microsatellite stability, and high loss of heterozygosity. Bronchoscopy revealed a left hilar mass, and lymph node biopsy confirmed LCNEC (CK7+, chromogranin+, TTF- 1+, synaptophysin+), establishing a diagnosis of stage IV pulmonary LCNEC with pancreatic and liver metastases. The patient began treatment with bevacizumab, paclitaxel, carboplatin, and atezolizumab, resulting in improvement in hilar, hepatic, and pancreatic lesions on further imagings. The patient was continued on chemoimmunotherapy.

Discussion

This case highlights an uncommon presentation of LCNEC in a young, non-smoking male, initially manifesting as pancreatitis due to pancreatic metastasis. The absence of pulmonary symptoms complicated the diagnosis. Histopathology and immunohistochemistry were essential. While no standardized treatment exists for LCNEC, platinum-based chemotherapy with immunotherapy remains the mainstay. PD-L1 expression may guide immunotherapy decisions.

Conclusions

Pulmonary LCNEC should be considered in metastatic neuroendocrine tumors, even in young, non-smoking patients without pulmonary symptoms. Early tissue diagnosis and molecular profiling are key to guiding management.

Background

Pulmonary large-cell neuroendocrine carcinoma (LCNEC) is a rare, aggressive lung cancer subtype, comprising ~3% of lung malignancies. It commonly affects older, heavy smokers and presents at an advanced stage. Prognosis is poor, with a 5-year survival rate of 15–25% in metastatic disease.

Case Presentation

A 33-year-old previously healthy male presented with a month of abdominal and lower back pain, along with significant weight loss. Lab tests revealed elevated lipase (378), and he was initially treated for acute pancreatitis. Imaging revealed a 1.9 cm pancreatic head mass and three hypodense hepatic lesions. MRI confirmed these findings but remained inconclusive. An incidental 8 mm right lower lobe pulmonary nodule led to chest CT, identifying a dominant left lower lobe mass and mediastinal lymphadenopathy, raising suspicion for primary lung malignancy. The patient was discharged but returned three days later with worsening symptoms and a lipase of 754. Endoscopic biopsy of the pancreatic mass was deferred due to ongoing pancreatitis. A liver biopsy revealed neuroendocrine differentiation, positive for CK AE1/AE3, CK7, CK19, and synaptophysin. Molecular profiling showed PD-L1 (TPS 50%), low tumor mutational burden, microsatellite stability, and high loss of heterozygosity. Bronchoscopy revealed a left hilar mass, and lymph node biopsy confirmed LCNEC (CK7+, chromogranin+, TTF- 1+, synaptophysin+), establishing a diagnosis of stage IV pulmonary LCNEC with pancreatic and liver metastases. The patient began treatment with bevacizumab, paclitaxel, carboplatin, and atezolizumab, resulting in improvement in hilar, hepatic, and pancreatic lesions on further imagings. The patient was continued on chemoimmunotherapy.

Discussion

This case highlights an uncommon presentation of LCNEC in a young, non-smoking male, initially manifesting as pancreatitis due to pancreatic metastasis. The absence of pulmonary symptoms complicated the diagnosis. Histopathology and immunohistochemistry were essential. While no standardized treatment exists for LCNEC, platinum-based chemotherapy with immunotherapy remains the mainstay. PD-L1 expression may guide immunotherapy decisions.

Conclusions

Pulmonary LCNEC should be considered in metastatic neuroendocrine tumors, even in young, non-smoking patients without pulmonary symptoms. Early tissue diagnosis and molecular profiling are key to guiding management.