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  • Title: A randomized phase I clinical and biologic study of two schedules of sorafenib in patients with myelodysplastic syndrome or acute myeloid leukemia: a NCIC (National Cancer Institute of Canada) Clinical Trials Group Study.
    Author: Crump M, Hedley D, Kamel-Reid S, Leber B, Wells R, Brandwein J, Buckstein R, Kassis J, Minden M, Matthews J, Robinson S, Turner R, McIntosh L, Eisenhauer E, Seymour L.
    Journal: Leuk Lymphoma; 2010 Feb; 51(2):252-60. PubMed ID: 20109071.
    Abstract:
    Sorafenib is a small molecule inhibitor of RAF kinase, VEGFR-2, c-KIT, and FLT3. In this randomized phase I study, eligible patients had relapsed/refractory acute myeloid leukemia (AML), and one prior induction regimen, or were age >65 with untreated myelodysplastic syndrome (MDS) or secondary AML. Sorafenib was given orally for 28 days (cont) or 14 days (int) every 4 weeks at three dose levels (100, 200, and 400 mg BID); 300 mg cont was also tested. Forty-two patients were enrolled (median age 71 [37-82]; prior chemotherapy: 22). Dose-limiting toxicity (DLT) was: 100 mg BID: 0/7 patients; 200 mg BID: 2/12 patients; 400 mg BID: 1/17 patients. Sorafenib 400 mg cont was not tolerated in this population: 6/8 received <14 days of treatment due to toxicity; no DLT was seen with 300 mg cont. One CR was seen in a patient with AML with FLT3-ITD. Flow cytometry studies suggest that sorafenib inhibits ERK phosphorylation via c-KIT. The recommended phase II dose in AML is 300 mg BID continuously, and testing in combination and in FLT3-ITD AML is warranted.
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