HGF and gastrointestinal stromal tumor: HGF overexpression was seen in undifferentiated pleomorphic sarcomas (12/36, 33%), angiosarcomas (6/39, 15%), clear cell sarcomas (2/13, 15%), malignant peripheral nerve sheath tumors (3/24, 13%), leiomyosarcomas (5/68, 7%) and GIST (1/126, 0.8%).