The samples from blood and/or bone marrow were analysed in 7 children at the time of initial diagnosis or relapse and in 9 children with clinical and hematologic remission of ALL. Molecular genetic methods were more sensitive than morphologic ones in leukemic cells detection: 5 children in remission of ALL demonstrated gene rearrangements. Clinical significance of the presence of low numbers of leukemic cells in remissions is still unknown.

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