Abstract
Chronic lymphocytic leukemia (CLL) remains incurable with chemoimmunotherapy, and allogeneic hematopoietic stem cell transplantation (HSCT) offers the potential for cure. We assessed the outcomes of 108 CLL patients undergoing first allogeneic HSCTs, 76 with reduced-intensity (RIC) and 32 with myeloablative conditioning (MAC) between 1998 and 2009 at Dana-Farber Cancer Institute. With median follow-up of 5.9 years in surviving patients, the 5-year overall survival (OS) for the entire cohort is 63% for RIC regimens and 49% for MAC regimens (P=0.18). The risk of death declined significantly starting in 2004, and we found that 5-year OS for HSCT between 2004 and 2009 was 83% for RIC regimens compared with 47% for MAC regimens (P=0.003). For RIC transplantation, we developed a prognostic model based on predictors of progression-free survival (PFS), specifically remission status, lactate dehydrogenase, comorbidity score and lymphocyte count, and found 5-year PFS to be 83% for Score 0, 63% for Score 1, 24% for Score 2 and 6% for Score ⩾3 (P<0.0001). We conclude that RIC HSCT for CLL in the current era is associated with excellent long-term PFS and OS, and, as potentially curative therapy, should be considered early in the disease course of relapsed high-risk CLL patients.
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Acknowledgements
We are indebted to the nurses, medical oncology fellows, house staff and social workers of the Dana-Farber Cancer Institute and Brigham and Women’s Hospital for their excellent care of these patients. We thank the staff of the Connell-O’Reilly Cell Manipulation Laboratory and the Blood Component Laboratory of the Dana-Farber Cancer Institute for processing stem cells for these patients, and the data management staff for their tireless work in maintaining the DFCI BMT clinical data repository, without which this project would not be possible. This work was supported by NIH Grants K23 CA115682-01 to JRB, PO1 HL070149, PO1 CA81538 to JGG, A129530 to RJS, P01 CA142106 to JHA, and by the Jock and Bunny Adams Research and Education Endowment and the Ted and Eileen Pasquarello Research Fund. JRB is a Scholar of the American Society of Hematology as well as a Scholar in Clinical Research of the Leukemia and Lymphoma Society.
Author contributions
JRB, HTK, JHA and EPA designed the research. JRB, HTK, PA, CC, DCF, VH, JK, JR, CW, JHA, RJS, JGG and EPA performed the research. PA, CC, DCF, VH, JK, JR, JHA, RJS, JGG and EPA enrolled patients. JRB and HTK analyzed the data. JRB and HTK wrote the paper with input from PA, JHA, RJS, JGG and EPA.
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JR Brown has served as a consultant for Pharmacyclics and for Calistoga Pharmaceuticals.
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Brown, J., Kim, H., Armand, P. et al. Long-term follow-up of reduced-intensity allogeneic stem cell transplantation for chronic lymphocytic leukemia: prognostic model to predict outcome. Leukemia 27, 362–369 (2013). https://doi.org/10.1038/leu.2012.228
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DOI: https://doi.org/10.1038/leu.2012.228
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