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Liposome-Encapsulated Doxorubicin in Combination With Standard Agents (cyclophosphamide, vincristine, prednisone) in Patients With Newly Diagnosed AIDS-Related Non-Hodgkin's Lymphoma: Results of Therapy and Correlates of Response

From the Departments of Medicine, Pathology, and Radiology, University of Southern California Keck School of Medicine, Los Angeles, CA; and Elan Corp, Princeton, NJ

Address reprint requests to Alexandra M. Levine, MD, Norris Cancer Hospital and Research Institute, 1441 Eastlake Ave, MS-34, Los Angeles, CA 90033; e-mail: alevine{at}usc.edu

PURPOSE: To evaluate the safety and efficacy of liposomal doxorubicin (Myocet; Medeus Pharma Ltd, Herts,UK) when substituted for doxorubicin in the CHOP regimen (cyclophosphamide, doxorubicin, vincristine, prednisone) in patients with newly diagnosed AIDS-related non-Hodgkin's lymphoma (AIDS-NHL). Secondary objectives were to assess the impact of HIV viral control on response and survival, and to correlate MDR-1 expression with outcome.

PATIENTS AND METHODS: Liposomal doxorubicin at doses of 40, 50, 60, and 80 mg/m² was given with fixed doses of cyclophosphamide, vincristine, and prednisone every 21 days. All patients received concurrent highly active antiretroviral therapy. NHL tissues were evaluated for multidrug resistance (MDR-1) expression.

RESULTS: Twenty-four patients were accrued. 67% had high or high-intermediate International Prognostic Index scores; the median CD4 lymphocyte count was 112/mm³ (range, 19/mm³ to 791/mm³). No dose-limiting toxicities were observed at any level, with myelosuppression being the most frequent toxicity. Overall response rate was 88%, with 75% complete responses (CRs), and 13% partial responses. The median duration of CR was 15.6+ months (range, 1.7 to 43.5+ months). Effective HIV viral control during chemotherapy was associated with significantly improved survival (P = .027), but CRs were attained independent of HIV viral control. MDR-1 expression did not correlate with response, suggesting that the liposomal doxorubicin may evade this resistance mechanism.

CONCLUSION: Liposomal doxorubicin in combination with cyclophosphamide, vincristine, and prednisone is active in AIDS-NHL, with complete remissions achieved in 75% independent of HIV viral control or tissue MDR-1 expression. HIV viral control is associated with a significant improvement in survival. Additional studies are warranted.

Authors' disclosures of potential conflicts of interest are found at the end of this article.

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