title: Clonal chromosome changes in stimulated lymphocytes of untreated human B-cell leukemias.
abstract: The chromosome constitution of peripheral blood lymphocytes from nine cases of B-cell chronic lymphocytic leukemia and one case of B-cell prolymphocytic leukemia were studied at diagnosis following stimulation by B- and T-cell activators. Chromosome analysis with banding techniques revealed an extra chromosome 12 (trisomy 12) in 4 B-cell chronic lymphocytic leukemia cases and complicated abnormalities, i.e., trisomy 12, 6q-, 14q+, and a translocation between chromosomes 6 and 12, [t(6; 12)] in the prolymphocytic leukemia case. These findings suggest that trisomy 12 is a prototypic change in B-cell leukemia, particularly in B-cell chronic lymphocytic leukemia. Based on sister chromatid exchange studies of unstimulated lymphocytes, it appears that some leukemia cells with a normal karyotype not only divide but also proliferate in vitro.
mesh_terms: D000368:Aged; D002869:Chromosome Aberrations; D002871:Chromosome Banding; D002906:Chromosomes, Human, 6-12 and X; D005260:Female; D006801:Humans; D007945:Leukemia, Lymphoid / Q000097:blood*; D008213:Lymphocyte Activation; D008214:Lymphocytes / Q000276:immunology / Q000648:ultrastructure*; D008297:Male; D008875:Middle Aged; D011947:Receptors, Antigen, B-Cell / Q000032:analysis; D012397:Rosette Formation; D014314:Trisomy
chemical_list: D011947:Receptors, Antigen, B-Cell