Abstract
The chromosomal complement of 28 children with the diagnosis of acute nonlymphocytic leukemia (ANLL) were examined. An abnormal cytogenetic pattern was found in 50% of these patients, which is similar to the results in adults with ANLL. Unlike the reports in adult patients, however, no specific chromosomal changes were found. This observation may imply that the etiology and mechanisms by which abnormal clones develop in ANLL could differ significantly between children and adults. Those patients with chromosomal abnormalities in their initial bone marrow sample had a median survival of 7.1 mo, whereas those with a normal diploid pattern in their bone marrow had a median survival of 20.5 mo (1-sided, p = 0.04). If all metaphases were abnormal, the median survival was only 3 mo.
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