In the context of HGSOC, several studies have explored the association between PD-L1 expression and prognosis [10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25], and meta-analyses on PD-L1 expression in ovarian cancer have been conducted [26,27,28,29]. Here, CD274 is linked to ovarian cancer.