Detection of trisomy 12 by FISH in untreated B-chronic lymphocytic leukemia: correlation with stage and CD20 antigen expression intensity.
We studied cells from 30 controls and 85 cases of untreated B-chronic lymphocytic leukemia (CLL) with a fluorescence in-situ hybridization (FISH) technique utilizing a probe to chromosome 12. By use of a threshold of > 2% for trisomy 12 for the CLL cases (the mean +3 SD for controls was 1.3%), 20% (17/85) were trisomy 12. The mean % cells positive was 32.6 (median, 39.4; range, 2.4-79.1). There was a trend toward an higher incidence of trisomy 12 in patients with Rai stages 1-4 vs Rai 0 (p = 0.16). Forty-seven % (8/17) of patients with trisomy 12 had strong intensity CD20 antigen expression compared to 21% (14/68) of patients without trisomy 12 (p = 0.03). Trisomy 12 associated with CLL is easily detected by FISH with an overall incidence of 20%. This technique should be applied to larger groups of patients to confirm the potential variation among Rai stages and immunophenotypic subgroups.
Witzig
T E
TE
Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota 55905.
Borell
T J
TJ
Herath
J F
JF
Tefferi
A
A
Li
C Y
CY
Jenkins
R B
RB
D015703:Antigens, CD / Q000032:analysis*; D018951:Antigens, CD20; D000944:Antigens, Differentiation, B-Lymphocyte / Q000032:analysis*; D002881:Chromosomes, Human, Pair 12; D005260:Female; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D015451:Leukemia, Lymphocytic, Chronic, B-Cell / Q000235:genetics* / Q000276:immunology / Q000473:pathology; D008297:Male; D009367:Neoplasm Staging; D014314:Trisomy
D015703:Antigens, CD; D018951:Antigens, CD20; D000944:Antigens, Differentiation, B-Lymphocyte