CD274 and Ewing sarcoma: Out of 43% of the cases showing positive PD-L1 expression, staining was positive in 100% of epithelioid sarcoma, 53% of synovial sarcoma, 38% of rhabdomyosarcoma and 33% of Ewing sarcoma, whereas PD-L1 was not expressed in any of the mesenchymal chondrosarcoma.