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Prepublished online as a Blood First Edition Paper on November 27, 2002; DOI 10.1182/blood-2002-09-2928.

Submitted October 1, 2002
Accepted November 19, 2002
A phase II trial of combination low-dose thalidomide and prednisone for the treatment of myelofibrosis with myeloid metaplasia
Ruben A Mesa, David P Steensma, Animesh Pardenani, Chin-Yang Li, Michelle A Elliott, Scott H Kaufmann, Gregory Wiseman, Leigh A Gray, Georgene Schroeder, Terra Reeder, Jerome Zeldis, and Ayalew Tefferi*
Hematology, Mayo Clinic, Rochester, MN, USA
Hematopathology, Mayo Clinic, Rochester, MN, USA
Nuclear Medicine, Mayo Clinic, Rochester, MN, USA
Cancer Center Statistics, Mayo Clinic, Rochester, MN, USA
Celgene Corporation, Warren, NJ, USA
* Corresponding author; email: tefferi.ayalew{at}mayo.edu.
Single agent thalidomide (THAL) at "conventional" doses (>100 mg /day) has been evaluated in myelofibrosis with myeloid metaplasia (MMM) based on its anti-angiogenic properties and the prominent neo-angiogenesis that occurs in MMM. THAL monotherapy at such doses produces approximately a 20% response rate in anemia but is poorly tolerated (an adverse dropout rate of >50% in 3 months). In order to improve efficacy and tolerability, we prospectively treated 21 symptomatic (hemoglobin <10 g/dL or symptomatic splenomegaly) MMM patients with low-dose THAL (50 mg/day) along with a three-month oral prednisone (PRED) taper (beginning at 0.5 mg/kg/day). THAL-PRED was well tolerated in all enrolled patients, with 20 patients (95%) able to complete three months of treatment. An objective clinical response was demonstrated in 13 (62%) patients, all improvements in anemia. Among 10 patients who were erythrocyte transfusion dependent, 7 (70%) improved and 4 (40%) became transfusion independent. Among 8 patients with thrombocytopenia (platelet count <100 x 109/L), 6 (75%) experienced a 50% increase in their platelet count. In 4 of 21 patients (19%) spleen size decreased by more than 50%. Responses observed were mostly durable after discontinuation of the prednisone. The dose of thalidomide in this study (50mg/day) was better tolerated than the higher doses used in previous studies. Adverse events associated with corticosteroid therapy were mild and transient. Clinical responses did not correlate with improvements in either intramedullary fibrosis or angiogenesis. THAL-PRED is well tolerated and preliminarily appears to be a promising drug regimen for treating cytopenias in patients with MMM.

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