Which of the following is a kidney cancer that originates from proximal tubules?

• A. Oncocytoma
• B. Angiomyolipoma
• C. Urothelial Carcinoma
• D. Renal Cell Carcinoma

Answer: (D)

Understanding where kidney cancers arise along the nephron is essential. Renal cell carcinoma originates from the epithelial cells of the proximal tubules, the part of the nephron after the glomerulus responsible for most reabsorption. This makes it the classic cancer that starts in proximal tubule epithelium. The other options fit different tissues or are benign tumors: oncocytoma typically comes from the collecting ducts and is not malignant; angiomyolipoma is a benign tumor of blood vessels, smooth muscle, and fat; urothelial carcinoma arises from the urothelium lining the renal pelvis and urinary tract. Therefore, the cancer that begins in proximal tubules is renal cell carcinoma.