CD274 and osteosarcoma: Also in cases of sarcoma, several previous studies have reported that more than 50% of sarcomas, including leiomyosarcoma, dedifferentiated liposarcoma (DDLPS), undifferentiated pleomorphic sarcoma (UPS), osteosarcoma, epithelioid sarcoma, and other sarcomas, showed PD-L1 expression in tumor cells [11–13].