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Originally published as JCO Early Release 10.1200/JCO.2008.19.5032 on December 15 2008 © 2009 American Society of Clinical Oncology.
Progress in Mantle-Cell LymphomaCenter for Lymphoma and Myeloma, Division of Hematology and Medical Oncology; and Department of Medicine, Weill Cornell Medical College and NewYork-Presbyterian Hospital, New York, NY Recognition of mantle-cell lymphoma (MCL) in the 1994 Revised European-American Lymphoma classification of lymphoid neoplasms as a distinct entity enabled several groups to describe their clinical experiences.1–6 The investigators found that MCL had the unfortunate characteristics of being incurable as with indolent lymphomas, yet often rapidly progressive, similar to aggressive histologies. Median overall survival (OS) cited in these early series was in the range of 2 to 4 years, prompting several groups to propose novel therapeutic approaches to improve patient outcomes. One common strategy in MCL involved intensification of therapy. Several early reports described single-center experiences with high-dose chemotherapy and autologous stem-cell transplantation (ASCT).7–15 Patient numbers were generally small, and OS rates varied considerably—from 24% at 3 years10 to 80% at 4 years.14 Since 2000, multiple phase II studies using ASCT in first or later remission reported progression-free survival (PFS) and OS rates comparing favorably with those of historical cohorts.16–28 Dreyling et al29 conducted an important randomized trial, which demonstrated that after initial chemotherapy with cyclophosphamide, vincristine, doxorubicin, and prednisone, patients with MCL who were randomly assigned to ASCT rather than interferon, had a significant PFS—but not OS—benefit. Varying interpretations of these and other data have led many to advocate for the use of ASCT, despite its yet unproven impact on survival. Concurrently, Romaguera et al30 at The University of Texas M. D. Anderson Cancer Center (Houston, TX) published the results of a single-center, phase II trial of rituximab combined with alternating cycles of hyperfractionated cyclophosphamide/vincristine/doxorubicin/dexamethasone and methotrexate/cytarabine. The response rate was 97%, with 82% 3-year OS. These data supported the idea that intensive treatment approaches might improve long-term outcomes. Since then, other investigators have published variations on the regimen, some including ASCT, with encouraging results.31–33 It is debatable, however, to what degree the data from these trials are influenced by biases based on the characteristics of patients (younger and more fit) who are candidates for such approaches.34 In a recent multicenter Southwest Oncology Group trial examining rituximab combined with alternating cycles of hyperfractionated cyclophosphamide/vincristine/doxorubicin/dexamethasone and methotrexate/cytarabine, nearly half of all patients were unable to complete therapy because of toxicity.35 The goal of any treatment is to cure when possible, to extend survival when cure is not possible, and to improve quality of life. How do aggressive therapies fit into this schema with respect to MCL? With the debatable exception of allogeneic stem-cell transplantation, there is little evidence that cure can be achieved for most patients with MCL. Therefore, a key question is whether OS can be extended by the choice of a specific therapy. A secondary, but important, issue is whether PFS benefits, clearly achievable with more intensive treatments, translate into improved quality of life. More specifically, is the benefit of being in remission longer worth the toxicity from more aggressive treatment? Currently, this seems to be a very individualized issue based on pace of disease, MCL-related symptoms, risks of the treatment, age, comorbid illness, performance status, and patient preferences. In the near term, if approached in an evidence-based fashion, the choice of a treatment approach for a patient with MCL will remain a complex problem requiring significant discussion and consideration. In this issue of Journal of Clinical Oncology, Hermann et al36 provide data vital to the discussion of patient outcomes in MCL. The investigators compared the outcomes of 134 patients from two Kiel Lymphoma Study Group trials between 1975 and 1986 with those of 202 patients evaluated on two German Lymphoma Study Group trials performed since 1996. Although not a randomized comparison, OS in the latter cohort nearly doubled, from 2.7 to 4.8 years. Similar findings have been observed in follicular lymphoma.37,38 In both cases, it is of interest to postulate what changes were responsible for such a significant apparent improvement. Patients in the GLSG cohort of the current study received anthracycline- or anthracenedione-containing chemotherapy, approximately one third received rituximab, and a small number (fewer than 7%) received ASCT in first remission. Data from randomized trials, however, do not support the hypothesis that any of these differences prolong OS.39 Enhanced supportive care may have had a small, but significant, impact. We believe that the greatest advances in MCL outcomes are due to improved second-, third-, and fourth-line therapeutic options. This hypothesis is encouraging, because it suggests that although patients with MCL are not cured, we may be improving our ability to achieve disease control over time, even after relapse. Whether the results described by Herman et al are fully valid or could better by explained by bias must also be considered. Improved diagnostic techniques have likely changed the characteristics of the patient population over time. In addition, there may be lead time bias in the timing of initiation of therapy (study entry after observation and delayed first treatment v study entry and therapy immediately at diagnosis). As the authors point out, "patient selection is a great caveat of historical comparisons." Using careful statistical methodology, the investigators have attempted to identify and correct for bias as much as possible. Indeed, it is encouraging that patients with MCL seem to be doing better. Importantly, although a survival estimate of 5 years still leaves considerable room for improvement, Hermann et al36 have provided a contemporary benchmark that future trials will need to exceed. What do we need to do to continue to make progress in MCL? The following directions are necessary:
For at least the near term, management of individual patients with MCL will remain challenging. Sorting through the available data and their limitations to devise a strategy for an individual patient requires thoughtful consideration. Clinical trials should be a priority when therapy is being considered. Data such as those provided by Hermann et al36 are particularly important, because they highlight that research efforts are making a difference and that patients with MCL can do better with newer approaches. Collaboration among physicians, researchers, and patients will continue to improve outcomes, and all those involved can make an important difference in making increased survival a reality. AUTHORS' DISCLOSURES OF POTENTIAL CONFLICTS OF INTEREST Although all authors completed the disclosure declaration, the following author(s) indicated a financial or other interest that is relevant to the subject matter under consideration in this article. Certain relationships marked with a "U" are those for which no compensation was received; those relationships marked with a "C" were compensated. For a detailed description of the disclosure categories, or for more information about ASCO's conflict of interest policy, please refer to the Author Disclosure Declaration and the Disclosures of Potential Conflicts of Interest section in Information for Contributors. Employment or Leadership Position: None Consultant or Advisory Role: John P. Leonard, Genentech (C), Biogen Idec (C), Millenium (C), Johnson and Johnson (C), Celgene (C), Novartis (C), Cephalon (C); Morton Coleman, Genentech (C), Biogen Idec (C), Genzyme (C), Celgene (C), Immunomedics (C), Medtronics (C) Stock Ownership: Morton Coleman, Immunomedics Honoraria: John P. Leonard, Genentech, Biogen Idec, Millenium, Johnson and Johnson, Celgene, Novartis, Cephalon; Morton Coleman, Genzyme Research Funding: None Expert Testimony: John P. Leonard, Genentech (C) Other Remuneration: None AUTHOR CONTRIBUTIONS Conception and design: Peter Martin, Morton Coleman, John P. Leonard Manuscript writing: Peter Martin, Morton Coleman, John P. Leonard Final approval of manuscript: Peter Martin, Morton Coleman, John P. Leonard REFERENCES
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Copyright © 2009 by the American Society of Clinical Oncology, Online ISSN: 1527-7755. Print ISSN: 0732-183X
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