We evaluated a syngeneic KP tumor model (344SQ) derived from KrasLA1/+; TP53R172HΔG (KP) mice in the 129/Sv background (17, 19), a highly metastatic lung cancer model that has been previously shown to partially respond to PD-(L)1 blockade (17, 18, 40). This evidence concerns the gene CD274 and lung carcinoma.