PMID: 8603004Feb 1, 1996Paper

Trisomy 12 defines a group of CLL with atypical morphology: correlation between cytogenetic, clinical and laboratory features in 544 patients

British Journal of Haematology
E MatutesD Catovsky

Abstract

We have analysed the clinical and laboratory features in 544 patients with chronic lymphocytic leukaemia (CLL) with available cytogenetics and fluorescence in-situ hybridization (FISH) analysis for trisomy 12 in half of them, to examine the correlation between chromosome abnormalities and clinical or laboratory parameters. Five chromosome groups were defined: (1) trisomy 12 (18%), detected as the sole abnormality or associated with other changes; (2) del(13)(q12-14) (7%); (3) other abnormal karyotypes (20%); (4) normal karyotype (41%); and (5) no divisions (14%). There were no differences in the age distribution between the five groups. Clinical stages (Binet) were: A (74%), B (12%) and C (14%). Stage A was common in cases with del(13q)(82%), normal (84%) and other abnormal karyotypes (74%), whereas it was less common in trisomy 12 cases (64%) and those with no divisions (48%). Typical CLL morphology was found in 83% of cases; 10% had more than 10% prolymphocytes (CLL/PL) and 7% had other atypical features. CLL with trisomy 12 was the only group with a high frequency of either CLL/PL (31%) or atypical morphology (24%). Atypical morphology and CLL/PL were even more frequent when trisomy 12 was associated with other chromosomal a...Continue Reading

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