CD274 and pneumonitis: Despite the clinically relevant concern for immune checkpoint inhibitor–induced (ICI-induced) pneumonitis, bleomycin-exposed mSTING mice with anti–PD-L1 therapy showed a noteworthy reduction in inflammation/fibrosis compared with WT mice (Figure 7, C and D), with an attendant decrease in muscularized large pulmonary vessels (Supplemental Figure 9, A–C).