Safety Study of IPI-504 in Patients With Gastrointestinal Stromal Tumors (GIST) or Soft Tissue Sarcomas (STS)

"IV administration of IPI-504 for 21-day cycles. Two different schedules of treatment will be tested. On Schedule A, doses occur on Days 1, 4, 8, and 11 followed by 10 days with no study drug administration. On Schedule B, doses occur on Days 1, 4, 8, 11, 15, and 18, or twice weekly for 3 weeks continuously.~For both Schedule A and B doses will be administered ≥ 72 hours apart."