The larger collection of non-type-I papillary RCCs is composed of type II papillary renal carcinomas, including duct carcinomas, medullary renal cell carcinomas, the MiTF kidney cancers (TFE3, TFEB), and hereditary leiomyomatosis RCC-associated kidney cancers.51 The gene discussed is MITF; the disease is breast ductal adenocarcinoma.