From among 1464 children with ALL 167 (11.4%) at diagnosis had two or less than two years, 53 of them were infants. Most of them had a great tumor bulk, 15 had initial CNS infiltration and 31 WBCc greater than or equal to 100000/ML. 66 were treated according to St. Jude or LSA2L2 programs (the I group), 101 according to BFM programs (the II group). Complete remission was obtained in 85% of patients. In 63 children relapses occurred in the course of treatment whereas in 5 after the therapy cessation. In majority of cases, there were isolated relapses, mostly, they involved bone marrow. CNS involvement was found, in both mixed and isolated relapses, in 28 children (20%). 64 children are alive, in 43 of them the therapy was stopped. Kapla-Meier estimates for event free survival (EFS) after 8 years were 19 +/- 4.7% in the first group vs 37.38 +/- 6.3% in the second group. Due to therapy intensification the treatment results have been improved (p = 0.05) but still they are not satisfactory, particularly in case of infants and children with WBC greater than or equal to 100000/ML. Analysis of the lot of children showed that apart from age at ALL diagnosis and the initial WBC the methods of treatment are also the prognostic factors.
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