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Value of intravenous 6-mercaptopurine during continuation treatment in childhood acute lymphoblastic leukemia and non-Hodgkin's lymphoma: final results of a randomized phase III trial (58881) of the EORTC CLG.

Author(s): van der Werff Ten Bosch J, Suciu S, Thyss A, Bertrand Y, Norton L, Mazingue F, Uyttebroeck A, Lutz P, Robert A, Boutard P, Ferster A, Plouvier E, Maes P, Munzer M, Plantaz D, Dresse MF, Philippet P, Sirvent N, Waterkeyn C, Vilmer E, Philippe N, Otten J

Affiliation(s): Department of Pediatrics, Akademisch Ziekenhuis - VUB, Brussels, Belgium.

Publication date & source: 2005-05, Leukemia., 19(5):721-6.

Publication type: Clinical Trial; Clinical Trial, Phase III; Randomized Controlled Trial

Between November 1990 and November 1996, EORTC Children Leukemia Group conducted a randomized trial in de novo acute lymphoblastic leukemia and lymphoblastic non-Hodgkin's lymphoma patients using a Berlin-Frankfurt-Munster protocol to evaluate the monthly addition of intravenous 6-mercaptopurine (i.v. 6-MP) (1 g/m(2)) to conventional continuation therapy comprising per oral MTX weekly and 6-MP daily. Only during the first 18 months of the randomization period, 6-MP p.o. was interrupted for 1 week after each i.v. 6-MP. A total of 877 patients was randomized to either no i.v. 6-MP (Arm A) or additional i.v. 6-MP (Arm B). A total of 217 relapses (91 in Group A vs 128 in Group B) and 13 deaths in CR (5 vs 8) were reported; a total of 134 patients (55 vs 79) died. The median follow-up was 7.6 years. At 8 years, the disease-free survival rate was lower (P=0.005) in Arm B (69.1% (s.e.=2.2%)) than in Arm A (77.9% (s.e.=2.0%)), and the hazard ratio was 1.45 (95% CI 1.12-1.89). In conclusion, as delivered in this study, i.v. 6-MP was detrimental to event-free survival.

Page last updated: 2006-01-31

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