Cell Therapeutics' Highly Selective Oral JAK 2 Inhibitor, Pacritinib, Demonstrates Encouraging Anti-tumor Activity

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Cell Therapeutics
CTIC
announced today that the phase 1 study data of its highly selective oral JAK2 inhibitor pacritinib, or SB1518, showed encouraging anti-tumor activity and good tolerability in 34 patients with relapsed/refractory lymphoma.  The results were published online in the Journal of Clinical Oncology in September, 2012. Thirty-four patients received daily oral doses of pacritinib ranging from 100mg to 600mg. The maximal tolerated dose was not reached. Median time on study was 88 days (range of one to 574 days) with six patients on pacritinib for longer than six months. Seventeen of the 34 patients (50%) had measurable decreases in target tumor measurements ranging from 4% to 70% shrinkage. Partial remissions were noted in three patients (mantle cell (2), indolent lymphoma (1)) while 15 patients had stable disease. Median progression free and overall survival was 120 and 130 days, respectively.  Gastrointestinal (GI) side effects were most frequent and mild to moderate (grade 1-2) with no patient reporting severe (grade 3-4) GI side effects even at the 600mg dose level. Cytopenias were infrequent and modest (less than 15% all grades).
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Posted In: NewsGuidanceManagement
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