CDKN2A and hepatocellular carcinoma: The aim of this study was to investigate the effect of zebularine on p16INK4a, p14ARF, p15INK4b, and DNA methyltransferase 1 gene expression, cell growth inhibition, and apoptosis induction in human hepatocellular carcinoma PLC/PRF5 and pancreatic cancer PA-TU-8902 cell lines.