- Stratum C: Newly diagnosed, poor-risk metastatic sarcoma consisting of unresectable pulmonary metastases (≥ 6 nodules) and/or disease involving multiple bones or other organs NOTE: *Patients with recurrent primary CNS tumors are eligible for the phase II portion of this study provided there are no significant intratumoral bleeding toxicities seen in either COG pediatric phase I studies of dasatinib or the phase I portion of this study