CD274 and bone metastasis: Univariate analysis included age (<60 vs ≥60), gender (male vs female), smoking status (current/former vs never), ECOG PS score (0–1 vs 2), intrathoracic metastasis (yes vs no), liver metastasis (yes vs no), bone metastasis (yes vs no), brain metastasis (yes vs no), ICIs treatment (yes vs no), programmed death ligand 1 (PD-L1) tumor proportion score (TPS) (≥1% vs <1%), and PD-L1 TPS (unknown vs <1%) (as variables).