Fig. 1

CD47 and PD-L1 expression in EOC by immunohistochemistry and Hematoxylin–Eosin (200 ×). A HE staining was used for verification. B Negative expression (CPS < 1) of PD-L1. C Positive expression (CPS = 35) of PD-L1. D Negative expression (0, −) of CD47. E Low expression (2, +) of CD47. F High expression (12, +  + +) of CD47