PDCD1 and non-small cell lung carcinoma: In our previous retrospective analysis of PD‐1 inhibitor monotherapy for NSCLC, pre‐existing ILD was identified as a risk factor for ICI‐induced pneumonitis, and the frequency of pneumonitis increased from 5.8% in the non‐ILD group to 35.1% in the pre‐existing ILD group.12