Nelson N Stone1, Vassilios Skouteris2, Richard G Stock3. 1. Departments of Urology, Icahn School of Medicine at Mount Sinai, New York, NY; Radiation Oncology, Icahn School of Medicine at Mount Sinai, New York, NY. Electronic address: drnelsonstone@gmail.com. 2. The Brachytherapy Center, Hygeia Hospital, Athens, Greece. 3. Radiation Oncology, Icahn School of Medicine at Mount Sinai, New York, NY.
Abstract
PURPOSE: Men with Gleason grade Group (GG) 4 and 5 prostate cancer have high failure rates when treated by conventional therapy. We investigated the effect of higher radiation doses on freedom from biochemical failure (FBF) and prostate cancer mortality (cause-specific survival [CSS]) in men treated with a combination of permanent implant and external beam irradiation (EBRT). METHODS AND MATERIALS: Three hundred twenty men with GG4 (n = 186) and 5 (n = 134) prostate cancer were treated with I-125 or Pd-103 implant followed by 45 Gy of EBRT. Radiation doses were converted to the biological equivalent dose (BED). The median age, prostate-specific antigen (PSA), time on hormone therapy, BED, and followup were 69 years, 9.0 ng/mL, 9 months, 210 Gy, and 6.5 years, respectively. FBF and CSS were calculated by Kaplan-Meier method with associations determined by log rank and Cox regression. RESULTS: Ten-year FBF for GG4 vs. 5 was 77.8 vs. 61.3% (p = 0.015), and CSS was 94 vs. 79.3% (p = 0.001). Men with lower PSA had improved FBF and CSS (p < 0.001). Thirty-one of 320 died of prostate cancer of which 10/186 (5.4%) had GG4 and 21/134 (15.7%) GG5 (OR 3.3, p = 0.002). BED <200 Gy was associated with a 2.2× greater BF (p = 0.004) and 2.4× prostate cancer mortality (p = 0.020). Significant covariates on regression analysis for FBF and CSS were PSA (p = 0.014), GG (p = 0.007), BED (p = 0.009), and GG (p = 0.001). CONCLUSIONS: Survival rates for high-grade prostate cancer are favorable when diagnosed in men with lower PSA and treated with doses of BED > 200 Gy. Higher BED is achieved with a combination of I-125 (110 Gy) or Pd-103 (100 Gy) and 45 Gy EBRT.
PURPOSE:Men with Gleason grade Group (GG) 4 and 5 prostate cancer have high failure rates when treated by conventional therapy. We investigated the effect of higher radiation doses on freedom from biochemical failure (FBF) and prostate cancer mortality (cause-specific survival [CSS]) in men treated with a combination of permanent implant and external beam irradiation (EBRT). METHODS AND MATERIALS: Three hundred twenty men with GG4 (n = 186) and 5 (n = 134) prostate cancer were treated with I-125 or Pd-103 implant followed by 45 Gy of EBRT. Radiation doses were converted to the biological equivalent dose (BED). The median age, prostate-specific antigen (PSA), time on hormone therapy, BED, and followup were 69 years, 9.0 ng/mL, 9 months, 210 Gy, and 6.5 years, respectively. FBF and CSS were calculated by Kaplan-Meier method with associations determined by log rank and Cox regression. RESULTS: Ten-year FBF for GG4 vs. 5 was 77.8 vs. 61.3% (p = 0.015), and CSS was 94 vs. 79.3% (p = 0.001). Men with lower PSA had improved FBF and CSS (p < 0.001). Thirty-one of 320 died of prostate cancer of which 10/186 (5.4%) had GG4 and 21/134 (15.7%) GG5 (OR 3.3, p = 0.002). BED <200 Gy was associated with a 2.2× greater BF (p = 0.004) and 2.4× prostate cancer mortality (p = 0.020). Significant covariates on regression analysis for FBF and CSS were PSA (p = 0.014), GG (p = 0.007), BED (p = 0.009), and GG (p = 0.001). CONCLUSIONS: Survival rates for high-grade prostate cancer are favorable when diagnosed in men with lower PSA and treated with doses of BED > 200 Gy. Higher BED is achieved with a combination of I-125 (110 Gy) or Pd-103 (100 Gy) and 45 Gy EBRT.
Authors: Kilian E Salerno; Baris Turkbey; Liza Lindenberg; Esther Mena; Erica E Schott; Alexandra K Brennan; Soumyajit Roy; Uma Shankavaram; Krishnan Patel; Theresa Cooley-Zgela; Yolanda McKinney; Bradford J Wood; Peter A Pinto; Peter Choyke; Deborah E Citrin Journal: Brachytherapy Date: 2022-05-04 Impact factor: 2.441