Types: Urothelial carcinoma/ Transitional cell (90%) Risk Factors: Occupational exposures (dye manufacturers, rubber aluminum factories), smoking SCC of the bladder (5%) Associated with chronic inflammation (schistosoma, chronic UTI, chronic foley use) Treatment: Surgery Adenocarcinoma of bladder (2%) Treatment: Cystectomy Small cell bladder cancer (1%) Treatment: Cisplatin + Etoposide (like regimen for SCLC) →  RT or cystectomy Plasmacytoid: Associated with CDH1 gene mutatio