TFE3 and synovial sarcoma: We conducted immunohistochemical staining for TFE3 in all 50 SFTs and observed malignant peripheral neurilemmoma (n = 10), synovial sarcoma (n = 10), spindle cell lipoma (n = 10), dermatofibrosarcoma protuberans (n = 10), and dedifferentiated liposarcoma (n = 10).