Abstract:
BACKGROUND:In 1982, the Associazione Italiana Ematologia Oncologia Pediatrica (AIEOP) started its third-generation study, aiming to improve previous results obtained by AIEOP '79 study and to deliver a standardized treatment to most Italian children with acute lymphoblastic leukemia (ALL). METHODS:We treated 902 children (older than 1 year and younger than 15 years of age) with newly diagnosed ALL in multicenter studies of risk-directed therapy (111 low risk [LR] from Study 8201; 570 average risk [AR] from Study 8202; and 117 and 104 high risk [HR] from Studies 8303 and 8503, respectively). Induction therapy was composed of vincristine, prednisone, and asparaginase for LR or AR patients and these agents plus daunorubicin, (Study 8503) or vincristine, prednisone, cytarabine, and intermediate-dose methotrexate (Study 8303) for HR patients. Central nervous system (CNS) preventive therapy consisted of intrathecal methotrexate only (LR), intrathecal methotrexate plus 18 Gy cranial irradiation (AR and HR Study 8503), or high-dose (HD) cytarabine (HR Study 8303). Reinduction therapy was vincristine/prednisone/daunorubicin for AR patients with cyclophosphamide added for HR patients in Study 8303 and HD asparaginase in Study 8503. LR patients did not receive intensification therapy. Continuation therapy comprised 6-mercaptopurine plus methotrexate and monthly pulses with vincristine plus prednisone for all patients, except for HR patients in Study 8303 who also received teniposide plus cytarabine. Weekly HD asparaginase was also given in Study 8503. Duration of treatment was 24 months for Studies 8201 and 8202, 15 months for Study 8303, and 22 months for Study 8503. The overall complete remission (CR) rate was 94.7% (97.3% for LR, 94.9% for AR, and 93.2% for HR). RESULTS:Overall 7-year event-free survival (EFS) was 53.6% (standard error [SE], 1.8). EFS was 60.8% in LR (SE, 4.7), 60.6% in AR at 7 years (SE, 4.7), and 18.5% in Study 8303 (HR) at 5 years (SE, 3.8). Because of the poor result in HR patients, a successor study (8503) was developed that yielded a 5-year EFS of 46.1% (SE, 5.1). Site-specific relapse rates were 18.5% (LR), 13.4% (AR), 35.1% (HR on 8303), and 18.3% (HR in Study 8503) for bone marrow and 9.2%, 7.9%, 17.5%, and 19.3%, respectively, for the CNS (isolated). Isolated testicular relapse was observed in 3.9% of male patients. CONCLUSIONS:This risk-directed therapy cured at least 50% of patients with ALL with relatively nonintensive therapy. The 80% overall survival rate for LR and AR patients at 7 years suggested that the total cure rate may be higher than 50% because of the significant salvage rate for patients who received antimetabolite-based therapy initially.
journal_name
Cancerjournal_title
Cancerauthors
Vecchi V,Aricò M,Basso G,Ceci A,Madon E,Mandelli F,Masera G,Massimo L,Pession A,Zanesco Ldoi
10.1002/1097-0142(19931015)72:8<2517::aid-cncr2820subject
Has Abstract,Author List Incompletepub_date
1993-10-15 00:00:00pages
2517-24issue
8eissn
0008-543Xissn
1097-0142journal_volume
72pub_type
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