title: Loss of X chromosome in childhood acute lymphoblastic leukemia.
abstract: We present six cases of childhood acute lymphoblastic leukemia (ALL) in which an acquired loss of the X chromosome was detected. The cases derive from a consecutive series of 178 childhood ALL, consisting of 80 girls and 98 boys. In five cases the presence of the TEL-AML1, t(12;21), fusion product was detected by FISH. The single negative case had an unusual t(1;19)(p13;q13). In addition, this was the only case that did not have a cytogenetically visible rearrangement involving one of the chromosome regions 6q, 9p, or 12p. The six cases showed the typical presentation features of an ALL of FAB type L1, a common ALL immunophenotype with myeloid marker co-expression, and a median presenting age of 7 years. We, therefore, conclude that loss of chromosome X may be a secondary event in older girls with TEL-AML1-positive ALL.
authors: Department of Oncology, University Children's Hospital, Steinwiesstrasse 75, CH-8032, Zürich, Switzerland.
authors: M
authors: M
authors: Riesch
authors: F K
authors: FK
authors: Niggli
authors: K
authors: K
authors: Leibundgut
authors: U
authors: U
authors: Caflisch
authors: D R
authors: DR
authors: Betts
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D002872:Chromosome Deletion; D002881:Chromosomes, Human, Pair 12; D002891:Chromosomes, Human, Pair 21; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007621:Karyotyping; D015514:Oncogene Proteins, Fusion / Q000235:genetics; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000235:genetics*; D014178:Translocation, Genetic; D014960:X Chromosome
chemical_list: D015514:Oncogene Proteins, Fusion