PDCD1 and non-small cell lung carcinoma: For recurrent NSCLC after CRT, a retrospective study provided an interesting result: patients who had a shorter interval from the CRT to initiation of salvage anti-PD-1 therapy tended to have favorable PFS compared to those who had the longer interval (median, 17 months (95% CI: 0.47–not reached) vs. 4.9 months (95% CI: 1.47–8.43), respectively) [109].