CD274 and lung adenocarcinoma: Given the substantially greater prognostic value of multiple biomarkers than of a single biomarker [39], we next investigated whether the combination of PKM2 and PD-L1 expression could improve the prognostic value in lung adenocarcinoma and showed that patients with high PKM2 & high PD-L1 levels had shorter OS and DFS than patients with low PKM2 & low PD-L1 levels or patients with high PKM2 or PD-L1 levels alone.