Cytogenetic examination of multiple peripheral blood cultures of a patient with myelofibrosis with myeloid metaplasia revealed the presence of an interstitial deletion of the long arm of chromosome 11, del(11)(q13q21). A folic acid dependent fragile site fra(11)(q13) was found in about 12% of the cells. The possible correlation between constitutional fragile site and acquired chromosomal alteration is discussed briefly.
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