CD274 and chronic obstructive pulmonary disease: Data also included demographic and clinical characteristics: sex; age; body mass index (BMI); smoking status; history of chronic pulmonary diseases [interstitial lung disease (ILD), chronic obstructive pulmonary disease (COPD), asthma, or tuberculosis (TB)]; PD-L1 expression; tumor, node, and metastasis (TNM) stage; and Eastern Cooperative Oncology Group (ECOG) score.