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Blood, 15 August 2006, Vol. 108, No. 4, pp. 1165-1173. Prepublished online as a Blood First Edition Paper on April 11, 2006; DOI 10.1182/blood-2005-12-011809.
CLINICAL TRIALS AND OBSERVATIONS Intrathecal triple therapy decreases central nervous system relapse but fails to improve event-free survival when compared with intrathecal methotrexate: results of the Children's Cancer Group (CCG) 1952 study for standard-risk acute lymphoblastic leukemia, reported by the Children's Oncology GroupFrom the Department of Pediatrics, University of Wisconsin Children's Hospital, Madison; Department of Pediatrics, Doernbecher Children's HospitalOregon Health and Science University (OHSU), Portland; Department of Pediatric Hematology-Oncology, The Children's Hospital, Denver, CO; Division of Hematology-Oncology, Children's Hospital Los Angeles, CA; Children's Oncology GroupOperations Center, Arcadia, CA; Department of Hematology-Oncology, Children's Medical Center, Dayton, OH; Department of Pediatric Hematology/Oncology, CancerCare Manitoba, Winnipeg, Canada; C. S. Mott Children's Hospital, Ann Arbor, MI; Department of Cytogenetics, Ohio State University, Columbus Children's Hospital; University of Chicago Medical Center, IL; South Carolina Cancer Center, Columbia; Cancer Institute of New Jersey, University of Medicine and Dentistry of New Jersey, New Brunswick; and Department of Pediatrics, Sacred Heart Hospital, Pensacola, FL.
The Children's Cancer Group (CCG) 1952 clinical trial for children with standard-risk acute lymphoblastic leukemia (SR-ALL) compared intrathecal (IT) methotrexate (MTX) with IT triples (ITT) (MTX, cytarabine, and hydrocortisone sodium succinate [HSS]) as presymptomatic central nervous system (CNS) treatment. Following remission induction, 1018 patients were randomized to receive IT MTX and 1009 ITT. Multivariate analysis identified male sex, hepatomegaly, CNS-2 status, and age younger than 2 or older than 6 years as significant predictors of isolated CNS (iCNS) relapse. The 6-year cumulative incidence estimates of iCNS relapse are 3.4% ± 1.0% for ITT and 5.9% ± 1.2% for IT MTX; P = .004. Significantly more relapses occurred in bone marrow (BM) and testicles with ITT than IT MTX, particularly among patients with T-cell phenotype or day 14 BM aspirate containing 5% to 25% blasts. Thus, the estimated 6-year event-free survivals (EFS) with ITT or IT MTX are equivalent at 80.7% ± 1.9% and 82.5% ± 1.8%, respectively (P = .3). Because the salvage rate after BM relapse is inferior to that after CNS relapse, the 6-year overall survival (OS) for ITT is 90.3% ± 1.5% versus 94.4% ± 1.1% for IT MTX (P = .01). It appears that ITT improves presymptomatic CNS treatment but does not improve overall outcome.
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