- The following specific histologic subtypes of soft tissue sarcomas will be excluded: GIST, Kaposi's sarcoma, mesothelioma, dermatofibrosarcoma, chordoma, alveolar soft-part sarcoma. Also, all bone sarcomas are excluded including Ewing's sarcoma, osteosarcoma, GIST, low grade chondrosarcoma, and chordoma.