CD274 and non-small cell lung carcinoma: Meanwhile, the parenchyma biopsies of NSCLC patients with higher PD-L1 expression were enriched with Actinomyces graevenitzii as well as Streptococcus mitis, and had decreased levels of Porphyromonas gingivalis as well as Prevotella nanceiensis. The stool samples of NSCLC patients with higher PD-L1 expression were enriched with Erysipelotrichaceae UCG-006, Olsenella, Parasutterella, the Rikenellaceae RC9 gut group, and Klebsiella pneumoniae.