FAP and undifferentiated pleomorphic sarcoma: The study found FAP expression in the cell lines of fibrosarcoma, malignant fibrous histiocytoma (MFH), leiomyosarcoma, osteosarcoma, chondrosarcoma, liposarcoma, synovial sarcoma, and undifferentiated sarcoma, although the number of samples in each category was small (n ≤ 10)3.