GSTM3 and nonpapillary renal cell carcinoma: It both down‐regulated in metastatic vs primary ccRCC cells and primary ccRCC cells vs adjacent normal renal tissues.7 We also studied the tumour suppressor role of GSTM3 in the progression of ccRCC and a polymorphism rs1332018 which was significantly associated with the postoperative prognosis of ccRCC.8