PDCD1 and susceptibility to pneumonia measurement: The median courses of PD-1 inhibitor was 8 (range 6–17), with 16 patients stopping anti-PD-1 treatment because of disease progression, one patient discontinued treatment due to immunotherapy-associated pneumonia (Grade1) after four courses of PD-1 inhibitor, and one patient discontinued treatment due to radiation-induced pneumonia (Grade 3).