Acetylsalicylic acid Not Yet Recruiting Phase 1 Trials for Prostate Carcinoma Metastatic in the Bone / Stage IV Urethral Cancer AJCC v8 / Ureter Small Cell Carcinoma / Stage IVB Bladder Cancer AJCC v8 / Stage III Urethral Cancer AJCC v8 / Stage IV Bladder Cancer AJCC v8 / Bladder Small Cell Neuroendocrine Carcinoma / Castration-Resistant Prostate Carcinoma / Metastatic Urethral Urothelial Carcinoma / Prostate Small Cell Carcinoma / Stage III Bladder Cancer AJCC v8 / Stage IVA Bladder Cancer AJCC v8 / Stage III Prostate Cancer AJCC v8 / Stage IV Prostate Cancer AJCC v8 / Prostate Neuroendocrine Neoplasm / Metastatic Bladder Urothelial Carcinoma / Transitional Cell Carcinoma Treatment