Primary objectives
1. To estimate the response rate, defined as objective response at 2, 4 or 6 months or stable disease at 6 months, of dasatinib self-administered daily in subjects with leiomyosarcoma, liposarcoma, osteosarcoma including high-grade (mesenchymal and dedifferentiated) chondrosarcomas, Ewing's sarcoma, pleomorphic undifferentiated sarcoma (MFH), rhabdomyosarcoma, and MPNST.
2. To estimate the 6-month progression-free survival rate of "indolent" sarcomas to include alveolar soft part sarcoma (ASPS), chordoma, epithelioid sarcoma, hemangiopericytoma, giant cell tumor of bone and conventional (Grades 1 and 2) chondrosarcoma treated with dasatinib.
3. To estimate the 6-month progression-free survival rate of gastrointestinal stromal tumors.
Secondary objectives
1. To estimate the 2, 4 and 6 month progression-free survival rates and median time- to-progression of subjects with leiomyosarcoma, liposarcoma, osteosarcoma including high-grade (mesenchymal and dedifferentiated) chondrosarcomas, Ewing's sarcoma, MFH, rhabdomyosarcoma, and MPNST treated with dasatinib.
2. To estimate the 2 and 4 month progression-free survival rate and median time-to progression of subjects with "indolent" sarcomas treated with dasatinib.
3. To est. the 2 & 4 month progression-free survival rate & median time-to-progression of subjects with GIST treated with dasatinib.
4. To est. the overall survival rates at 2 & 5 yrs from registration of subjects treated with dasatinib.
5. To collect information about clinically significant adverse events & serious adverse events in subjects with sarcoma treated with dasatinib.
6. To prospectively collect uni-dimensional & bi-dimensional tumor size, tumor volumes & tumor average density determined by computer-aided automated detection in a subset of subjects with tumor predominantly involving the lung.
7. Obtain tumor tissue for creation of tissue microarrays to examine the frequency of kinase expression such as SRC and/or FAK in leiomyosarcoma, liposarcoma, osteosarcoma, MFH, rhabdomyosarcoma, MPNST, chondrosarcoma, Ewing's, ASPS, chordoma, epithelioid sarcoma, giant cell tumor of bone &
hemangiopericytoma, & GIST if activity of the drug in a subtype warrants further study.
8. Obtain tumor tissue to examine the frequency of mutations in kinases such as PDGFR in leiomyosarcoma, liposarcoma, osteosarcoma, MFH, rhabdomyosarcoma, MPNST, chondrosarcoma, Ewing's, ASPS, chordoma, epithelioid sarcoma, giant cell tumor of bone & hemangiopericytoma & GIST if activity of the drug in a subtype warrants further study.
9. Obtain blood samples to characterize plasma level of dasatinib & inhibition of SRC and/or FAK in peripheral blood mononuclear cells 2 hrs after ingestion of drug at 2-4 weeks from the start of treatment if activity of the drug in a sarcoma subtype warrants further study. The correlative plasma drug levels & peripheral blood mononuclear cells will be collected at a subset, principally the University of
MI., of the participating sites
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