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Blood, 1 April 2007, Vol. 109, No. 7, pp. 2999-3006. Prepublished online as a Blood First Edition Paper on December 7, 2006; DOI 10.1182/blood-2006-08-044446.
Submitted August 31, 2006
Section of Molecular Hematology and Therapy, Department of Blood and Marrow Transplantation, University of Texas M. D. Anderson Cancer Center, Seattle, WA * Corresponding author; email: skornblau{at}mdanderson.org.
Following exposure to cytotoxic agents, AML blasts elevate cellular cholesterol, in a defensive adaptation that increases chemoresistance, but blockade of HMG-CoA reductase with statins restores chemosensitivity in vitro. This phase I study evaluated adding pravastatin (PV) (40-1680 mg/day days 1-8), to idarubicin (ida)(12 mg/M2/d, days 4-6) + high-dose cytarabine (HDAC) (1.5 g/M2/day by CI, days 4-7) in 15 newly diagnosed and 22 salvage patients with unfavorable (n=26) or intermediate (n=10) prognosis cytogenetics. Compared to historical experience with Ida-HDAC, the duration of neutropenia and throbmbocytopenia and the toxicity profile were unaffected by the addition of PV. During PV loading (day 0-4) serum triglyceride, total and LDL cholesterol levels decreased in nearly all patients. Pharmacokinetic studies demonstrated higher and more sustained serum PV levels with PV doses above 1280 mg/day. CR/CRp was obtained in 11 of 15 new patients, including 8 of 10 with unfavorable cytogenetics, and 9 of 22 salvage patients. An MTD for PV+Ida-HDAC was not reached. Addition of PV to Ida-HDAC was safe and the encouraging response rates support conducting further trials evaluating the effect of cholesterol modulation on response in AML.
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