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Blood, 1 March 2002, Vol. 99, No. 5, pp. 1527-1535

CLINICAL OBSERVATIONS, INTERVENTIONS, AND THERAPEUTIC TRIALS

A randomized study of interferon-alpha versus interferon-alpha and low-dose arabinosyl cytosine in chronic myeloid leukemia

Michele Baccarani, Gianantonio Rosti, Antonio de Vivo, Francesca Bonifazi, Domenico Russo, Giovanni Martinelli, Nicoletta Testoni, Marilina Amabile, Mauro Fiacchini, Enrico Montefusco, Giuseppe Saglio, and Sante Tura for the Italian Cooperative Study Group on Chronic Myeloid Leukemia

From the L. and A. Seràgnoli Institute of Hematology and Medical Oncology, S. Orsola Hospital, University of Bologna, Italy; Division of Hematology, Udine University Hospital, Italy; Division of Hematology, La Sapienza, Rome University, Italy; and Division of Internal Medicine, University of Turin at Orbassano, Italy.

Interferon-alpha (IFN-alpha ) has significantly prolonged survival in chronic myeloid leukemia (CML), but some patients do not respond and many responses are not durable. To improve the results, IFN-alpha has been combined with other treatments, but so far only the association with low-dose arabinosyl cytosine (LDAC) has been shown to increase the response rate and to prolong survival. Here are reported the results of a study of 538 Philadelphia chromosome-positive CML patients who were assigned at random to treatment with IFN-alpha 2a alone or in combination with LDAC. The scheduled dose of IFN-alpha 2a was 56 IU/m2/d. The scheduled dose of AC was 40 mg/d for the first 10 days of each month of treatment. The efficacy endpoints were a complete hematologic response rate at 6 months (62% in the IFN-alpha -plus-LDAC arm versus 55% in the IFN-alpha arm; P = .11), major cytogenetic response (MCgR) rate at 24 months (28% versus 18%; P = .003), and overall survival (5-year survival, 68% versus 65%; P = .77). Treatment did not affect overall survival within different prognostic risk groups: low, intermediate, or high. Also the duration of MCgR was identical. The results of this study confirm the results of a similar French study only for the response rate, not for survival, suggesting that the relationship between cytogenetic response and survival may be extremely variable and that a meta-analysis of these and other studies of IFN-alpha versus IFN-alpha plus LDAC is required to settle the issue of the role of LDAC in the treatment of CML.

© 2002 by The American Society of Hematology.
 

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