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Clinical Trials |
Vancouver Cancer Centre, British Columbia Cancer Agency, Vancouver, British Columbia, V5Z 4E6 Canada [K. N. C., M. E. G., R. K., N. M., C. B., D. E. L. d. M., S. D.]; The Prostate Centre, Vancouver General Hospital, Vancouver, British Columbia, V6H 3Z6 Canada [K. N. C., M. E. G.]; and Institute for Drug Development, Cancer Therapy and Research Center, San Antonio, Texas 78229 [A. W. T.]
Purpose: Bcl-2 is a negative prognostic indicator in prostate cancer, implicated in the development of androgen independence and treatment resistance, and is overexpressed in hormone-refractory prostate cancer (HRPC). Genasense is a phosphorothioate antisense oligonucleotide complementary to the bcl-2 mRNA open reading frame that in preclinical studies has shown significant activity in inhibiting expression of Bcl-2, delaying androgen independence, and improving chemosensitivity in prostate and other cancer models. In this dose escalation study, we evaluated the combination of Genasense and mitoxantrone, a standard chemotherapy for patients with HRPC.
Design: Twenty-six patients with HRPC were treated at seven dose levels receiving Genasense at a dose ranging from 0.6 to 5.0 mg/kg/day and mitoxantrone from 4 mg/m2 to 12 mg/m2. Genasense was administered as a 14-day i.v. continuous infusion every 28 days with mitoxantrone given as an i.v. bolus on day 8.
Results: No dose-limiting toxicities were observed. Hematological toxicities were transient and included neutropenia, thrombocytopenia, and lymphopenia. Nonhematological toxicities included fatigue, fever, nausea, arthralgias, myalgias, and transient elevations in serum creatinine, none of which were severe. Two patients had >50% reductions in prostate-specific antigen. One patient, who received six cycles of Genasense at 1.2 mg/kg/day and a low dose (4 mg/m2) of mitoxantrone, also had symptomatic improvement in bone pain. Peripheral blood lymphocyte Bcl-2 protein expression decreased in five of five patients given Genasense at 5mg/kg/day (mean change from baseline, -12.8%; SD, 16.4%) as assessed by flow cytometry. Serum concentrations of Genasense given at doses of 3 mg/kg/day and greater, exceeded 1 µg/ml.
Conclusions: Genasense and mitoxantrone are well tolerated in combination, and mitoxantrone can be delivered at a standard dose with biologically active doses of Genasense without significant additional toxicity. This observation allays concerns about trials that combine Genasense with full doses of other cytotoxic agents seeking greater evidence of activity.
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