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Twenty-five years have elapsed since the first case of del(5q) was discovered in this laboratory. It was reported in 1974 with other subsequently found cases. As the sole anomaly or together with other chromosome changes, deletions of the long arm of 5 have been found in a large variety of...
The incidence of trisomy 12 and 13q12-q14 abnormalities in patients with chronic lymphocytic leukemia (CLL) was determined by conventional cytogenetics and interphase fluorescence in situ hybridization (FISH). In the analysis of 580 consecutive patients, trisomy 12 was detected by conventional...
Cytogenetic analysis of patients with chronic B-cell leukemia (B-CLL) indicates that 50% have chromosome abnormalities, while fluorescence in situ hybridization (FISH) and molecular techniques reveal an even higher incidence. Trisomy 12 and deletions or translocations of chromosome 13q14 are the...
The t(14;19)(q32.3;q13.2) is a rare but recurrent translocation found in patients with B-cell malignancies, mainly in chronic B-cell lymphoproliferative disorders. When occurring in chronic lymphocytic leukemia (CLL), atypical lymphocyte morphology and immunophenotype have been reported. A high...
Cytogenetic clues and molecular techniques have led to the identification of a very large number of genes involved in the pathogenesis of human leukemias and lymphomas, most of them previously unknown and many of them “activated” by chromosomal translocations. The oncogenic effects of most of...
Today, laboratory geneticists help clinical hematologists diagnose chronic granulocytic leukemia (CGL) and monitor the response of patients undergoing treatment. The most common genetic tests for CGL include quantitative cytogenetic studies, fluorescence in situ hybridization with probes for BCR...
Chromosome termini, termed telomeres, provide important protection to avoid loss of master gene(s) that may exist at subtelomeric regions. Moreover, erosion of telomeres by cell division through end-replication problems resulted in telomeric-associated cytogenetic aberrations. To maintain a...
A short review of chromosome 21 abnormalities in acute lymphoblastic leukemia (ALL) is presented. Trisomy and polysomy 21 are nonrandom anomalies that are frequently observed in ALL. Their occurrence, although not specific, as well as the high incidence of acute leukemia in subjects with...
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