A CASE OF ACUTE LYMPHOBLASTIC LEUKEMIA WITH TRANSLOCATION t(1;7) (q41,p22) t(4;12)(q34;q23), +mar.

Abstract. A lot of data has been accumulated proving that chromosome changes in patients with acute lymphoblastic leukemia are of great clinical and prognostic significance. Due to the widespread introduction of differential staining of chromosomes into practice, it became possible to study the karyotype in patients not only at the onset of the disease but also at different stages of its development. It has been shown that individual chromosomal aberrations are specific for certain types of acute leukemia. Several chromosomal markers are associated with a favorable prognosis (for example, hyperdiploid - more than 50 chromosomes in acute lymphoblastic leukemia). Other karyotype disorders, such as, for example, the "Philadelphia" chromosome in acute lymphoblastic leukemia, loss, and deletion of chromosomes 5 and 7 in acute non-lymphoblastic leukemia, are prognostically unfavorable aberrations. Of great interest are rare variants of non-random chromosomal disorders, the role of which in the pathogenesis of leukemia is still not clear.

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