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- W2114032004 abstract "In treatment of childhood ALL, prevention of CNS relapse by cranial irradiation is followed by considerable long-term sequelae. In the three ALL-BFM (Berlin-Frankfurt-Münster) trials 70, 76, and 79, employing radiotherapy (8.5 Gy craniospinal, 18 or 24 Gy cranial irradiation) in all arms, the incidence of CNS relapses (isolated and combined) in standard-risk patients (SR, 60% of all children) was consistently less than 6%. A risk factor (RF) calculated from absolute blast number, liver, and spleen size at diagnosis was used to stratify patients in the subsequent trials ALL-BFM 81 and 83. In ALL-BFM 81, SR patients (RF less than 1.2) were randomized to receive 18 Gy cranial irradiation or intermediate-dose i.v. methotrexate (ID-MTX) (4 x 0.5 g/m2). In ALL-BFM 83, the SR group was further subdivided into group SR low (SR-L, RF less than 0.8) and group SR high (SR-H, RF 0.8 - less than 1.2). SR-L patients received no irradiation, and were tested by randomization for the effectiveness of an intensive reinduction regimen (protocol III). SR-H patients were randomized for 12 or 18 Gy. The results were as follows: In patients of both trials with RF less than 0.8, radiotherapy could be replaced by ID-MTX plus protocol III. Without protocol III, relapses increased from 15.7% to 31.7%. Concomitantly, the fraction of relapses with CNS involvement increased from 26.7% to 36.4%. However, SR patients with RF between 0.8 and 1.2 could not be protected by reinduction alone (isolated/overall CNS relapse rate with irradiation, 4%/5%; without irradiation, 11%/22%). Dosages of 12 and 18 Gy were found to be equally protective." @default.
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- W2114032004 date "1990-01-01" @default.
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- W2114032004 title "Central Nervous System Relapse Prevention in 1165 Standard-Risk Children with Acute Lymphoblastic Leukemia in Five BFM Trials" @default.
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- W2114032004 doi "https://doi.org/10.1007/978-3-642-74643-7_90" @default.
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