CD274 and small cell lung carcinoma: ,20 Accordingly, in the current study we aimed to evaluate (i) the expression pattern of CD47 and PD-L1, (ii) the relation between CD47/PD-L1 expression and recently discussed major molecular SCLC subtypes and (iii) the prognostic impact of CD47 and PD-L1 expression in a large international cohort of surgically treated Caucasian SCLC patients.