Bladder cancer is a form of cancer that develops in the urinary bladder. The different types of bladder cancer include squamous cell carcinoma, urothelial carcinoma, small cell carcinoma, and adenocarcinoma. Stage 0 and stage 1 bladder cancers are categorized as early-stage or initial-stage cancers, and stage 4 bladder cancer is referred to as advanced-stage cancer. https://www.hcgoncology.com/types-of-cancers/bladder-cancer/