Interestingly, PD-L1 was expressed in most subtypes except synovial sarcoma, where the expression level was significantly lower than in leiomyosarcoma (p < 0.001), UPS/MFS (p < 0.001), dedifferentiated liposarcoma (p < 0.05), and MPNST (p < 0.05). Here, CD274 is linked to synovial sarcoma.