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Originally published as JCO Early Release 10.1200/JCO.2008.17.7279 on November 10 2008 © 2008 American Society of Clinical Oncology. Improved Survival in Lymphoma Patients Receiving Sirolimus for Graft-Versus-Host Disease Prophylaxis After Allogeneic Hematopoietic Stem-Cell Transplantation With Reduced-Intensity Conditioning
From the Departments of Medical Oncology and Biostatistics, Dana-Farber Cancer Institute, Boston; and the Department of Medicine, Cambridge Hospital, Cambridge, MA Corresponding author: Philippe Armand, MD, PhD, Dana-Farber Cancer Institute, 44 Binney St, Boston, MA 02115; e-mail: parmand{at}partners.org Purpose Inhibitors of the mammalian target of rapamycin (mTOR) kinase have shown clinical activity in several lymphoma subtypes. Sirolimus, an mTOR inhibitor, also has activity in the treatment and prophylaxis of graft-versus-host disease (GVHD) after allogeneic hematopoietic stem-cell transplantation (HSCT). We hypothesized that the use of sirolimus for GVHD prophylaxis in patients with lymphoma might lead to improved survival after transplantation through a decreased incidence of disease progression. Patients and Methods We retrospectively analyzed 190 patients who underwent transplantation for lymphoma. We compared the outcomes of patients who received sirolimus for GVHD prophylaxis with those of patients who received transplantation with a combination of a calcineurin inhibitor and methotrexate without sirolimus. Results Overall survival (OS) after transplantation was significantly superior in the sirolimus group, which was confirmed in multivariable analysis. The benefit was restricted to patients undergoing reduced-intensity conditioning (RIC) HSCT (3-year OS, 66% for sirolimus group v 38% for no-sirolimus group; P = .007; hazard ratio [HR] for mortality in multivariable analysis = 0.5, P = .042). Patients who received sirolimus had a similar incidence of nonrelapse mortality but a decreased incidence of disease progression compared with patients who did not receive sirolimus (3-year cumulative incidence of progression, 42% v 74%, respectively; P < .001; HR for progression in multivariable analysis = 0.4, P = .01). The effect of sirolimus persisted after adjusting for the occurrence of GVHD. No such survival advantage was apparent in a similar comparison of patients who underwent transplantation for diseases other than lymphoma. Conclusion This study suggests that sirolimus can independently decrease the risk of lymphoma progression after RIC HSCT, paving the way for prospective clinical trials. published online ahead of print at www.jco.org on November 10, 2008. Supported in part by Grant No. P01 HL070149 from the National Heart, Lung, and Blood Institute. P.A. is a recipient of a career development award from the Leukemia and Lymphoma Society. Presented in part at the American Society of Blood and Marrow Transplantation/Center for International Blood and Marrow Transplant Research Tandem Meeting, February 13-17, 2008, San Diego, CA. Authors disclosures of potential conflicts of interest and author contributions are found at the end of this article.
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Copyright © 2008 by the American Society of Clinical Oncology, Online ISSN: 1527-7755. Print ISSN: 0732-183X
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