Leukemia 2


Similarly, there is a rough correspendence between the clinical course of patients  and the development of chromosomal abnormalities in their clones. Recurrent  chromosomal lesions typically found in B-CLL patients include deletion at 13q14.3,11q22-23,17p13, and 6q21, and amplifications of all or portions of chromosome 12. Deletion at 13q14.3 is found in greater than half of B-CLL cases over time  and is linked to loss of two  micro-RNAs that can regulate Bcl-2 expression. However, thus particular chromosomal abnormality is not especially dangerous  because patients exhibiting this deletion on one allele and no other DNA lesions in their clones have a clinical course  that is benign and comparable  to normal age-stratified individuals. In contrast, deletions at 11q22-23, 17p13, and 6q21 are generally associated  with more aggressive disease, perhaps because these deletions may affect important genes such as p53 (17p13 deletion), and ataxia telangiectasia mutated (ATM; 11q22-23 deletion). Longitudinal  studies, albeit  on a relatively limited number of patients, demonstrated that these ominuous cytogenetic abnormalities accumulate  progressively in the course of the disease  and more frequently in patients with U-CLL.

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