* median age or range if not available.

Abbreviations: n.r. not reported; CR complete remission; LFS, leukemia free survival; V, vincristine; P, prednisone; A, asparaginase; D, daunorubicine; C, cyclophosphamide; AC, cytarabine; M, methotrexate; MP, mercaptopurine; DX, dexamethasone; AD, adriamycin; TG, thioguanine; VM, teniposide; R, rubidazone; VP, etoposide; HDAC, high dose AC; HDM, high dose M; SCT, stem cell transplantation; Mi, mitoxantrone; BX, betamethasone; I, idarubicin.