CD274 and histiocytic sarcoma: In 19 (95%) of OMM, 20 (100%) of mammary adenocarcinoma, 18 (90%) of histiocytic sarcoma, 17 (85%) of diffuse large B-cell lymphoma, and 4 (80%) of gastric adenocarcinoma, PD-L1 was detected in the tumor cells (Supplementary Fig. 3a–e).