PNLIP and hepatocellular carcinoma: Fluroscence image showed that apoptotic cells were significantly elevated in ATO plus PTL group in three HCC cell lines, and FCM analysis demonstrated that 16.37%, 24.53% and 8.27% apoptotic rate in 2.5 μM alone, 5 μM ATO alone and 10 μM PTL alone treatment group, whereas combined treatment resulted in a 2~3-fold increase in the apoptotic rate of the HepG2 cells.