What is the most common histologic type of bladder cancer?

What is the most common histologic type of bladder cancer?

• A. Squamous cell carcinoma
• B. Adenocarcinoma
• C. Small cell carcinoma
• D. Urothelial (transitional cell) carcinoma

Answer: (D)

Urothelial (transitional cell) carcinoma is the most common histologic type of bladder cancer. It originates from the urothelium lining the bladder and accounts for the vast majority of cases in Western populations. This type often presents as papillary tumors that can be multifocal and range from low-grade, noninvasive lesions to high-grade, muscle-invasive disease. Major risk factors include cigarette smoking and exposure to aromatic amines from industrial dyes and solvents. Other histologies—squamous cell carcinoma, adenocarcinoma, and small cell carcinoma—are much rarer in the bladder. Squamous cell carcinoma is more related to chronic irritation or schistosomiasis; adenocarcinoma is rare and may arise from urachal remnants; small cell carcinoma is also rare and highly aggressive.

Urothelial (transitional cell) carcinoma is the most common histologic type of bladder cancer. It originates from the urothelium lining the bladder and accounts for the vast majority of cases in Western populations. This type often presents as papillary tumors that can be multifocal and range from low-grade, noninvasive lesions to high-grade, muscle-invasive disease. Major risk factors include cigarette smoking and exposure to aromatic amines from industrial dyes and solvents. Other histologies—squamous cell carcinoma, adenocarcinoma, and small cell carcinoma—are much rarer in the bladder. Squamous cell carcinoma is more related to chronic irritation or schistosomiasis; adenocarcinoma is rare and may arise from urachal remnants; small cell carcinoma is also rare and highly aggressive.