PCAT1 and colorectal carcinoma: Overexpression of PiHL displayed a drastic anti-apoptotic effect on p53+/+ CRC cells after 5-FU treatment (Figure 5A and Figure S12A), whereas PiHL had less effect on regulating 5-FU-induced apoptosis in p53 knockout HCT116 and RKO cells (Figure 5A and Figure S12A).