Taofik Oyekunle

BACKGROUND: Osteolytic lesions are present in 75% of multiple myeloma (MM) patients and frequently require palliation with radiation therapy (RT). Case series of MM patients with bone pain undergoing palliative RT suggest doses > 12 Gy (EQD2) provide excellent bone pain relief. However, recent advances in novel biologic agents have significantly improved overall survival and quality of life for MM patients. We hypothesized that lower-dose RT (LDRT, EQD2 < 12 Gy) offers an effective alternative to higher-dose RT (HDRT, EQD2 > 12 Gy) for palliation of painful MM bone lesions.

METHODS: We retrospectively identified MM patients treated with RT for painful bone lesions and stratified by EQD2 < 12Gy versus ≥12Gy. Clinical pain response (CPR) rates, acute and late toxicity, pain response duration, and retreatment rates between LDRT and HDRT groups were analyzed. RESULTS: Thirty-five patients with 71 treated lesions were included: 24 patients (49 lesions) treated with HDRT and 11 patients (22 lesions) with LDRT. Median follow up was 16.8 months. The median dose of HDRT treatment was 20 Gy (range 8-30 Gy, EQD2 12- 32.5 Gy) versus 4 Gy in the LDRT group (range = 4-8 Gy, EQD2 4.67-9.3 Gy). The CPR rate was 98% for HDRT and 95% for LDRT. There was no significant difference in any grade acute toxicity between the HDRT cohort and LDRT cohort (24.5% vs. 9.1%, χ² P=0.20). Pain recurred in 10% of lesions (12% HDRT versus 9.5% LDRT). Median duration of pain response did not significantly differ between cohorts (p=0.91). Five lesions were retreated, 2 (9.5%) in the LDRT cohort and 3 (6.3%) in the HDRT cohort.

CONCLUSIONS: In this study, LDRT effectively palliated painful MM bony lesions with acceptable CPR and duration of palliation. These data support prospective comparisons of LDRT versus HDRT for palliation of painful MM bony lesions.

BACKGROUND: Osteolytic lesions are present in 75% of multiple myeloma (MM) patients and frequently require palliation with radiation therapy (RT). Case series of MM patients with bone pain undergoing palliative RT suggest doses > 12 Gy (EQD2) provide excellent bone pain relief. However, recent advances in novel biologic agents have significantly improved overall survival and quality of life for MM patients. We hypothesized that lower-dose RT (LDRT, EQD2 < 12 Gy) offers an effective alternative to higher-dose RT (HDRT, EQD2 > 12 Gy) for palliation of painful MM bone lesions.

METHODS: We retrospectively identified MM patients treated with RT for painful bone lesions and stratified by EQD2 < 12Gy versus ≥12Gy. Clinical pain response (CPR) rates, acute and late toxicity, pain response duration, and retreatment rates between LDRT and HDRT groups were analyzed. RESULTS: Thirty-five patients with 71 treated lesions were included: 24 patients (49 lesions) treated with HDRT and 11 patients (22 lesions) with LDRT. Median follow up was 16.8 months. The median dose of HDRT treatment was 20 Gy (range 8-30 Gy, EQD2 12- 32.5 Gy) versus 4 Gy in the LDRT group (range = 4-8 Gy, EQD2 4.67-9.3 Gy). The CPR rate was 98% for HDRT and 95% for LDRT. There was no significant difference in any grade acute toxicity between the HDRT cohort and LDRT cohort (24.5% vs. 9.1%, χ² P=0.20). Pain recurred in 10% of lesions (12% HDRT versus 9.5% LDRT). Median duration of pain response did not significantly differ between cohorts (p=0.91). Five lesions were retreated, 2 (9.5%) in the LDRT cohort and 3 (6.3%) in the HDRT cohort.

CONCLUSIONS: In this study, LDRT effectively palliated painful MM bony lesions with acceptable CPR and duration of palliation. These data support prospective comparisons of LDRT versus HDRT for palliation of painful MM bony lesions.

BACKGROUND: Osteolytic lesions are present in 75% of multiple myeloma (MM) patients and frequently require palliation with radiation therapy (RT). Case series of MM patients with bone pain undergoing palliative RT suggest doses > 12 Gy (EQD2) provide excellent bone pain relief. However, recent advances in novel biologic agents have significantly improved overall survival and quality of life for MM patients. We hypothesized that lower-dose RT (LDRT, EQD2 < 12 Gy) offers an effective alternative to higher-dose RT (HDRT, EQD2 > 12 Gy) for palliation of painful MM bone lesions.

METHODS: We retrospectively identified MM patients treated with RT for painful bone lesions and stratified by EQD2 < 12Gy versus ≥12Gy. Clinical pain response (CPR) rates, acute and late toxicity, pain response duration, and retreatment rates between LDRT and HDRT groups were analyzed. RESULTS: Thirty-five patients with 71 treated lesions were included: 24 patients (49 lesions) treated with HDRT and 11 patients (22 lesions) with LDRT. Median follow up was 16.8 months. The median dose of HDRT treatment was 20 Gy (range 8-30 Gy, EQD2 12- 32.5 Gy) versus 4 Gy in the LDRT group (range = 4-8 Gy, EQD2 4.67-9.3 Gy). The CPR rate was 98% for HDRT and 95% for LDRT. There was no significant difference in any grade acute toxicity between the HDRT cohort and LDRT cohort (24.5% vs. 9.1%, χ² P=0.20). Pain recurred in 10% of lesions (12% HDRT versus 9.5% LDRT). Median duration of pain response did not significantly differ between cohorts (p=0.91). Five lesions were retreated, 2 (9.5%) in the LDRT cohort and 3 (6.3%) in the HDRT cohort.

CONCLUSIONS: In this study, LDRT effectively palliated painful MM bony lesions with acceptable CPR and duration of palliation. These data support prospective comparisons of LDRT versus HDRT for palliation of painful MM bony lesions.

PURPOSE: Moderately hypofractionated radiotherapy (MHRT) is a commonly used treatment modality for localized prostate cancer (LPC). In this setting, dosimetric correlations to acute and late toxicities remain poorly defined.

METHODS: Patients with LPC treated with MHRT between September 2008 and April 2018 were retrospectively identified. We excluded those with < 12 months follow up, elective nodal coverage, or additional boost. All patients received either 70Gy/28 fractions or 60Gy/20 fractions. Demographics, clinical outcomes, and toxicity data were obtained. Acute and late (≥3 months following MHRT completion) gastrointestinal (GI) and genitourinary (GU) toxicities were determined per CTCAE 5.0. Univariate and multivariate analyses were performed for acute and late grade 2+ GI/GU toxicity via logistic regression and log rank testing for demographic and dosimetric variables.

RESULTS: A total of 436 patients with LPC were treated with MHRT. Mean age was 64 years (IQR 60-68), median pre-treatment PSA was 8.7 (IQR 5.7-12.2), and T stages included T1a/2a (357), T2b/2c (58), and T3 (21). Acute grade 3 GU and GI toxicities were observed in 16(3.7%) and 3(0.7%) patients respectively, with no acute grade 4 toxicity events. Late grade 3 GU and GI toxicities were observed in 17(3.9%) and 4(0.9%) patients respectively, with two late grade 4 GI (0.05%) events. On multivariate analysis, acute grade 2+ GU toxicity was associated with pre-treatment PSA (odds ratio [OR] 1.02 95% confidence interval [CI] 1.01-1.04, P = 0.011) and pre-radiotherapy AUA SS (OR 1.06 95%CI: 1.03-1.09, P < 0.001); late grade 2+ GU toxicity was associated with pre-treatment AUA (hazard ratio [HR] 1.04 95%CI: 1.02-1.06, P < 0.001), lack of pre-treatment urinary meds (HR 0.65, 95%CI: 0.46-0.92, P = 0.049), and ADT use (HR 1.45, 95%CI: 1.03-2.03, P = 0.034); acute grade 2+ GI toxicity did demonstrate significant correlation; late grade 2+ GI toxicity was associated with ethnicity (Black vs White, HR 0.50, 95% CI: 0.25-0.99, P = 0.008) and pre-treatment PSA (HR 1.02, 95%CI: 1.00- 1.03, P = 0.024).

CONCLUSION: LPC patients completing MHRT experienced low rates of grade 3+ acute and late GU/GI toxicities. No dosimetric variables demonstrated significance on multivariate analysis of acute or late GU/ GI grade 2+ toxicity. Late grade 2+ GU toxicity was associated with ADT use, while late grade 2+ GI toxicity was associated with ethnicity and pre-treatment PSA.

PURPOSE: Moderately hypofractionated radiotherapy (MHRT) is a commonly used treatment modality for localized prostate cancer (LPC). In this setting, dosimetric correlations to acute and late toxicities remain poorly defined.

METHODS: Patients with LPC treated with MHRT between September 2008 and April 2018 were retrospectively identified. We excluded those with < 12 months follow up, elective nodal coverage, or additional boost. All patients received either 70Gy/28 fractions or 60Gy/20 fractions. Demographics, clinical outcomes, and toxicity data were obtained. Acute and late (≥3 months following MHRT completion) gastrointestinal (GI) and genitourinary (GU) toxicities were determined per CTCAE 5.0. Univariate and multivariate analyses were performed for acute and late grade 2+ GI/GU toxicity via logistic regression and log rank testing for demographic and dosimetric variables.

RESULTS: A total of 436 patients with LPC were treated with MHRT. Mean age was 64 years (IQR 60-68), median pre-treatment PSA was 8.7 (IQR 5.7-12.2), and T stages included T1a/2a (357), T2b/2c (58), and T3 (21). Acute grade 3 GU and GI toxicities were observed in 16(3.7%) and 3(0.7%) patients respectively, with no acute grade 4 toxicity events. Late grade 3 GU and GI toxicities were observed in 17(3.9%) and 4(0.9%) patients respectively, with two late grade 4 GI (0.05%) events. On multivariate analysis, acute grade 2+ GU toxicity was associated with pre-treatment PSA (odds ratio [OR] 1.02 95% confidence interval [CI] 1.01-1.04, P = 0.011) and pre-radiotherapy AUA SS (OR 1.06 95%CI: 1.03-1.09, P < 0.001); late grade 2+ GU toxicity was associated with pre-treatment AUA (hazard ratio [HR] 1.04 95%CI: 1.02-1.06, P < 0.001), lack of pre-treatment urinary meds (HR 0.65, 95%CI: 0.46-0.92, P = 0.049), and ADT use (HR 1.45, 95%CI: 1.03-2.03, P = 0.034); acute grade 2+ GI toxicity did demonstrate significant correlation; late grade 2+ GI toxicity was associated with ethnicity (Black vs White, HR 0.50, 95% CI: 0.25-0.99, P = 0.008) and pre-treatment PSA (HR 1.02, 95%CI: 1.00- 1.03, P = 0.024).

CONCLUSION: LPC patients completing MHRT experienced low rates of grade 3+ acute and late GU/GI toxicities. No dosimetric variables demonstrated significance on multivariate analysis of acute or late GU/ GI grade 2+ toxicity. Late grade 2+ GU toxicity was associated with ADT use, while late grade 2+ GI toxicity was associated with ethnicity and pre-treatment PSA.

PURPOSE: Moderately hypofractionated radiotherapy (MHRT) is a commonly used treatment modality for localized prostate cancer (LPC). In this setting, dosimetric correlations to acute and late toxicities remain poorly defined.

METHODS: Patients with LPC treated with MHRT between September 2008 and April 2018 were retrospectively identified. We excluded those with < 12 months follow up, elective nodal coverage, or additional boost. All patients received either 70Gy/28 fractions or 60Gy/20 fractions. Demographics, clinical outcomes, and toxicity data were obtained. Acute and late (≥3 months following MHRT completion) gastrointestinal (GI) and genitourinary (GU) toxicities were determined per CTCAE 5.0. Univariate and multivariate analyses were performed for acute and late grade 2+ GI/GU toxicity via logistic regression and log rank testing for demographic and dosimetric variables.

RESULTS: A total of 436 patients with LPC were treated with MHRT. Mean age was 64 years (IQR 60-68), median pre-treatment PSA was 8.7 (IQR 5.7-12.2), and T stages included T1a/2a (357), T2b/2c (58), and T3 (21). Acute grade 3 GU and GI toxicities were observed in 16(3.7%) and 3(0.7%) patients respectively, with no acute grade 4 toxicity events. Late grade 3 GU and GI toxicities were observed in 17(3.9%) and 4(0.9%) patients respectively, with two late grade 4 GI (0.05%) events. On multivariate analysis, acute grade 2+ GU toxicity was associated with pre-treatment PSA (odds ratio [OR] 1.02 95% confidence interval [CI] 1.01-1.04, P = 0.011) and pre-radiotherapy AUA SS (OR 1.06 95%CI: 1.03-1.09, P < 0.001); late grade 2+ GU toxicity was associated with pre-treatment AUA (hazard ratio [HR] 1.04 95%CI: 1.02-1.06, P < 0.001), lack of pre-treatment urinary meds (HR 0.65, 95%CI: 0.46-0.92, P = 0.049), and ADT use (HR 1.45, 95%CI: 1.03-2.03, P = 0.034); acute grade 2+ GI toxicity did demonstrate significant correlation; late grade 2+ GI toxicity was associated with ethnicity (Black vs White, HR 0.50, 95% CI: 0.25-0.99, P = 0.008) and pre-treatment PSA (HR 1.02, 95%CI: 1.00- 1.03, P = 0.024).

CONCLUSION: LPC patients completing MHRT experienced low rates of grade 3+ acute and late GU/GI toxicities. No dosimetric variables demonstrated significance on multivariate analysis of acute or late GU/ GI grade 2+ toxicity. Late grade 2+ GU toxicity was associated with ADT use, while late grade 2+ GI toxicity was associated with ethnicity and pre-treatment PSA.