Document Detail

In B-cell chronic lymphocytic leukaemia chromosome 17 abnormalities and not trisomy 12 are the single most important cytogenetic abnormalities for the prognosis: a cytogenetic and immunophenotypic study of 480 unselected newly diagnosed patients.
MedLine Citation:
PMID:  9444933     Owner:  NLM     Status:  MEDLINE    
Of 560 consecutive, newly diagnosed untreated patients with B CLL submitted for chromosome study, G-banded karyotypes could be obtained in 480 cases (86%). Of these, 345 (72%) had normal karyotypes and 135 (28%) had clonal chromosome abnormalities: trisomy 12 (+12) was found in 40 cases, 20 as +12 alone (+12single), 20 as +12 with additional abnormalities (+12complex). Other frequent findings included abnormalities of 14q, chromosome 17, 13q and 6q. The immunophenotype was typical for CLL in 358 patients (CD5+, Slg(weak), mainly FMC7-) and atypical for CLL in 122 patients (25%) (CD5-, or Slg(strong) or FMC7+). Chromosome abnormalities were found significantly more often in patients with atypical (48%) than in patients with typical CLL phenotype (22%) (P < 0.00005). Also +12complex, 14q+, del6q, and abnormalities of chromosome 17 were significantly more frequent in patients with atypical CLL phenotype, whereas +12single was found equally often in patients with typical and atypical CLL phenotype. The cytomorphology of most of the +12 patients was that of classical CLL irrespective of phenotype. In univariate survival analysis the following cytogenetic findings were significantly correlated to a poor prognosis: chromosome 17 abnormalities, 14q+, an abnormal karyotype, +12complex, more than one cytogenetic event, and the relative number of abnormal mitoses. In multivariate survival analysis chromosome 17 abnormalities were the only cytogenetic findings with independent prognostic value irrespective of immunophenotype. We conclude that in patients with typical CLL immunophenotype, chromosome abnormalities are somewhat less frequent at the time of diagnosis than hitherto believed. +12single is compatible with classical CLL, and has no prognostic influence whereas chromosome 17 abnormalities signify a poor prognosis. In patients with an atypical CLL immunophenotype, chromosome abnormalities including +12complex, 14q+, del 6q and chromosome 17 are found in about 50% of the patients, and in particular chromosome 17 abnormalities suggest a poor prognosis.
C H Geisler; P Philip; B E Christensen; K Hou-Jensen; N T Pedersen; O M Jensen; K Thorling; E Andersen; H S Birgens; A Drivsholm; J Ellegaard; J K Larsen; T Plesner; P Brown; P K Andersen; M M Hansen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Leukemia research     Volume:  21     ISSN:  0145-2126     ISO Abbreviation:  Leuk. Res.     Publication Date:    1997 Nov-Dec
Date Detail:
Created Date:  1998-02-10     Completed Date:  1998-02-10     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7706787     Medline TA:  Leuk Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1011-23     Citation Subset:  IM    
Department of Haematology, Rigshospitalet, Copenhagen, Denmark.
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MeSH Terms
Bone Marrow / pathology
Chromosome Aberrations*
Chromosomes, Human, Pair 12*
Chromosomes, Human, Pair 17*
Disease Progression
Leukemia, Lymphocytic, Chronic, B-Cell / genetics*,  pathology
Middle Aged
Neoplasm Staging
Prospective Studies
Survival Analysis

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