The presence of urinary AQP1 was not limited to patients with papillary and clear cell renal carcinomas in this study; patients with postoperative pathology reports of oncocytoma, benign cystic nephroma, and chromophobe renal cell carcinoma all had notable AQP1 bands via immunoblotting. The gene discussed is AQP1; the disease is chromophobe renal cell carcinoma.