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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Cytogenetic studies in patients with mastocytosis.
Cancer Genetics and Cytogenetics 2000 July 16
Chromosomal aberrations in hematopoietic cells are common in malignant hematological disorders and have also been reported in some patients with mastocytosis. In this study, 34 patients with either urticaria pigmentosa or systemic mastocytosis were investigated by cytogenetic analysis of bone marrow cells. A follow-up investigation was performed in 22 patients. Clones with chromosome abnormalities were found in 32% of the patients at the first examination and in 27% at the second examination; in total, 41% of the patients had an abnormal clone in at least one examination. No clinical correlation was found with regard to cytogenetic results, with the exception of four patients who had an associated hematological disease and poor prognosis. In the second examination, only 6 patients had an unchanged chromosome pattern, and 4 of the patients with an initial normal pattern had appearance of abnormal clones; however, in 7 patients, the initial abnormal cells disappeared. The abnormalities were, among others, deletions of chromosomes 5, 7, 11, and 20. The proportion of cells with structural or numerical chromosome changes was higher in comparison with reported control groups. The frequency and type of chromosome abnormalities in bone marrow cells from patients with mastocytosis was about the same as observed in other chronic myeloproliferative disorders and myelodysplastic syndromes, diseases which also developed in 4 of our patients. An association between malignant hematological disorders and mastocytosis have been suggested by us and others. The chromosome abnormalities maybe reflect a genetic instability of the hematopoietic cells in mastocytosis.
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