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. 1995 Apr;56(4):915–925.

Cytogenetic and molecular studies of Down syndrome individuals with leukemia.

J J Shen 1, B J Williams 1, A Zipursky 1, J Doyle 1, S L Sherman 1, P A Jacobs 1, A L Shugar 1, S W Soukup 1, T J Hassold 1
PMCID: PMC1801215  PMID: 7717402

Abstract

There is an increased risk of leukemia in Down syndrome (DS) patients, with estimates ranging from 14 to 30 times the incidence rate observed for chromosomally normal children. Furthermore, one type of leukemia, called "transient leukemia" (TL), occurs almost exclusively in DS infants. The basis of the association between DS and leukemia is unknown, but we and others have hypothesized that it may be influenced by the mechanism of origin of the extra chromosome. Therefore, we initiated a cytogenetic and molecular study of nondisjunction in leukemia DS individuals. To date, we have obtained blood and/or tissue samples from 55 individuals consisting of 17 cases with TL, 7 cases of acute nonlymphocytic leukemia subtype M7 (ANLL-M7, or acute megakaryoblastic leukemia, postulated to be related to TL), and 31 cases of other forms of leukemia. Analysis of these cases suggests differences between DS children with TL and those with other types of leukemia or DS individuals with no history of leukemia. Specifically, the TL and ANLL-M7 cases have a highly significant increase in the frequency of "atypical" constitutional karyotypes (i.e., mosaic trisomies, rings, and/or isochromosomes) and are almost always male. Additionally, genetic mapping studies suggest an increase in the frequency of disomic homozygosity, especially in proximal 21q, in DS individuals with TL and ANLL-M7.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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