NPC1 and renal cell carcinoma: However, the functions of BID, CASP4, ZFYVE1, PRKAR1A, NPC1, TP53INP2, HSPA8, EIF2S1, and BAG1 gene have not been reported in RCC, suggesting that the validation at cellular level, as well as cellular level studies, may reveal the function of these genes in both RCC development and progression.