CDKN2A and renal cell carcinoma: The transcription levels of the two H3K27 demethylase genes, UTX and JMJD3, the H3K27 methyltransferase EZH2 and the CDK4/CDK6 inhibitor p16INK4a were determined by qRT-PCR in cancer tissues and adjacent normal tissues from 36 RCC patients.