Background Therapy for childhood lymphoblastic leukemia hasevolved during the past three decades, but key questions aboutwhat are the least toxic, most effective forms of treatmentremain unanswered because of the lack of comprehensive follow-upinformation.
Methods To assess long-term outcome in the series of clinicaltrials conducted at St. Jude Hospital, we compared the resultsof treatment typical of four eras: exploratory combination chemotherapy(era 1, 1962 to 1966; 91 patients), regimens for the controlof meningeal leukemia (era 2, 1967 to 1979; 825 patients), limitedintensification of therapy (era 3, 1979 to 1983; 428 patients),and extended intensification of therapy (era 4, 1984 to 1988;358 patients). ("Intensification" refers to strategies of systemicchemotherapy that are more aggressive than conventional ones.)The major end points were survival and event-free survival;we also calculated the relative risk of treatment failure andthe rate of relapse or death after treatment ended (post-treatmentfailure rate).
Results The probability of event-free survival improved significantlyin each successive era (P<0.001 by the log-rank test), reaching71 percent in era 4. There was a decrease of approximately 50percent in the risk of treatment failure from one era to thenext in each subgroup of patients defined according to differentcombinations of the leukocyte count, race, age, and sex. Leukemiaappeared to be eradicated in patients who remained in completeremission for three years or more after treatment in era 4.The incidence of death due to nonleukemic causes remained 4to 6 percent despite the trend toward more intensive treatment.An estimated 765 patients (45 percent) are long-term survivors;most of them (80 percent) have no health problems related toleukemia or its treatment.
Conclusions The development and successful application of preventivetherapy for meningeal leukemia, followed by the intensificationof systemic chemotherapy, has progressively improved the rateof cure of childhood lymphoblastic leukemia, with relativelyfew adverse sequelae.
Source Information
From the Departments of Hematology-Oncology (G.K.R., W.M.C.) and Biostatistics (M.L.H.), St. Jude Children's Research Hospital, and the Department of Pediatrics, University of Tennessee, Memphis, College of Medicine (G.K.R., W.M.C.), both in Memphis; the M.D. Anderson Cancer Center, Houston (D.P.); and the Memorial Sloan-Kettering Cancer Center, New York (J.V.S.).
Address reprint requests to Dr. Rivera at 332 N. Lauderdale, P.O. Box 318, Memphis, TN 38101-0318.
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