Phase II Hedgehog Inhibitor for Myelodysplastic Syndrome (MDS)

Patients will be enrolled according to a two-step study design. Twenty patients will be enrolled in the first stage. All patients will be given a daily oral dose of PF-0444913 100 mg for up to 4 cycles, with an optional continuation phase. Dose escalation to 200 mg will be provided for patients who do not have at least hematologic improvement following 2 cycles, and dose reduction to 50 mg will be permitted for patients with significant toxicity. If at least 2 patients respond in the initial stage, and additional 15 patients will be enrolled in the second stage.