The present study has clearly shown that fibroblast-like spindle tumour cells strongly express FAP and DPP-IV in low-grade myofibroblastic sarcoma, fibroblastic areas of osteosarcoma, MFH, non-ossifying fibroma, desmoid tumour, and chondroblastoma. Here, DPP4 is linked to undifferentiated pleomorphic sarcoma.