A retrospective evaluation of PD-L1 expression on primary non-small cell lung cancer (NSCLC) samples and associated involved hilar or mediastinal lymph nodes (N1 or N2) (REPLICA).

9044Background: Little is known about the PD-L1 expression in early stage NSCLC as well as the possible heterogeneity of PD-L1 expression in different sites. This study provides information on both...