Abstract

Background. Modern therapy programs allow achieving high survival rates in children with acute lymphoblastic leukemia (ALL). However, there is a group of patients in whom a relapse occurs, which makes it necessary to search for optimal tools for monitoring remission and the earliest detection of ALL relapse. According to clinical and immunological studies, assessment of minimal residual disease (MRD) levels is one of the leading criteria for response to treatment and can be the basis for risk-stratified therapy.
 Aim. Assessment of MRD levels on the 15th day of induction as the main parameter for stratification of patients into prognostic risk groups and the impact of MOB levels on patient survival.
 Materials and methods. The study included 117 children with a newly diagnosed precursor B-cell ALL. All patients were given an induction course according to the BFM ALL IC 2009 protocol.
 MRD levels were determined by flow cytometry.
 Results. Given the MRD based stratification, a truly standard risk group was identified, the survival rate of which reached 100%.
 Conclusions. The use of MRD as the main tool for the risk of adapted therapy made it possible to improve survival in patients of the standard risk group, as well as to optimize therapy for high and medium risk groups in the future.

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