PIF1 and non-small cell lung carcinoma: Analysis of PIF1‐silenced A549 and H1299 cells at 24 h post‐irradiation revealed a significant increase in γH2AX‐positive TIF formation compared to control group, similar with IOX1 treatment experiments (Fig. 3A, B), underscoring the requirement of PIF1 for telomere maintenance in radiation-treated NSCLC.