CD274 and adenocarcinoma: A higher proportion of adenocarcinoma histology was observed in the DnI and PnI groups (p = 0.038), while a higher proportion of PD-L1 expression in the DI and PI groups (p = 0.010) was observed, and the highest proportion of KRAS mutation in the DI group (p = 0.145) was revealed, despite a significant difference being unreached.