Kidney cancer includes renal cell cancer, renal sarcoma and primary renal lymphoma... in which Renal Cell Carcinoma (RCC) accounts for more than 90% of cases, so in this article only Refers to the content of renal cell cancer. Renal cell carcinoma ranks second in malignancies of the urinary system and accounts for 1-2% of all cancers in adults. It usually occurs in adults over the age of 40, with twice as many men as women.