The purpose of this study is to provide certain data on clinical outcome of primary androgen deprivation therapy in men over 80 years of age with localized high-risk prostate cancer. This study included 54 Japanese super-elderly men with high-risk prostate cancer treated with primary androgen deprivation therapy between 2005 and 2015. The median overall survival was 9.1 years (95% confidence interval, 8.1-10.1) and no patient died from prostate cancer. Overall, 51.9% of patients experienced any grade of adverse events following androgen deprivation therapy. Associations between clinicopathological factors including comorbidity count at initial diagnosis and overall survival were investigated. On multivariate analysis, only comorbidity count at initial diagnosis [≥2 vs. ≤1; hazard ratio, 5.34 (95% confidence interval, 1.55-18.49); P = 0.003] was an independent risk factor for overall survival. Our findings suggest that comorbidity count at initial diagnosis is robustly prognostic for overall survival. For super-elderly men with localized high-risk prostate cancer, comorbidity count at initial diagnosis should be emphasized when deciding whether primary androgen deprivation therapy is necessary or not.
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