The PD‐L1 IHC expression in the tumor cells of primary OC lesions was associated with PD‐L1 expression in metastatic peritoneal lesions (Spearman's coefficient = 0.540; p < 0.001) High PD‐L1 IHC expression in TILs (>15% among TILs) was associated with poor OS (HR: 3.00 [1.05–8.72]; p = 0.041). Here, CD274 is linked to neoplasm.