Which combination lists the three established risk factors for transitional cell carcinoma?

• A. Smoking; Aniline Dyes; Cyclophosphamide
• B. Alcohol; UV Exposure; Age
• C. Low-Sodium Diet; Exercise; Hydration
• D. Chronic NSAID Use; Diabetes; Obesity

Answer: (A)

Transitional cell carcinoma of the bladder is strongly linked to carcinogens that are excreted in urine and come into contact with the urothelium. The most important risk factor is smoking, because tobacco smoke contains bladder carcinogens that are metabolized and eliminated in urine, causing DNA damage to the lining of the bladder. A second established factor is occupational exposure to aromatic amines found in aniline dyes; these substances are metabolized and excreted in urine, increasing urothelial mutagenesis. A third well-established risk factor is cyclophosphamide exposure; its metabolite acrolein irritates the bladder and can lead to cancer with repeated exposure. The other options don’t show these specific, strong associations with bladder transitional cell carcinoma.