Data showed that, when treated with 5‐fluorouracil, the apoptosis (Figure 2C) and the TdT‐mediated dUTP Nick‐End Labeling (TUNEL) staining (a maker of apoptosis) of DCLK1‐overexpressing CRC cells were significantly decreased, while the proliferating cell nuclear antigen (PCNA) staining (a maker of proliferation) was notably increased (Figure 2D). The gene discussed is PCNA; the disease is colorectal carcinoma.