+ 12 or trisomy 12
نویسنده
چکیده
Phenotype/cell stem origin virgin CD5+ recirculating B-cell; the classical CLL phenotype is CD5+, CD23+, CD22-, CD79a-, FMC7-, sIg weak; trisomy 12 is more often observed in CLL with morphologically and immunologically atypical cells, displaying CD5 negativity or FMC7 positivity and strong surface immunoglobulin staining; trisomy 12 is present in proliferating cells and seems to be associated with the absence of mutation of the Ig variable region genes. Epidemiology Trisomy 12 is found in one third of cytogenetically abnormal CLLs by conventional karyotype, and in about 12-54% of cases when interphase FISH is used.
منابع مشابه
Fluorescent in situ hybridization and cytogenetic studies of trisomy 12 in chronic lymphocytic leukemia.
Cytogenetic studies (CG) of 475 chronic lymphocytic leukemia (CLL) cases showed trisomy 12 in 6.1% or 26% of patients with abnormal karyotypes. Fluorescence in situ hybridization (FISH) detected trisomy 12 in 35% of 117 CLL patients. Only 34.6% of cases detected by FISH were detected by CG. Twelve patients had low levels of trisomic cells (4% to 11%) relative to clonal B cells (47.5% to 86%), s...
متن کاملTrisomy 12 and lymphoplasmacytoid lymphocytes in chronic leukemic B-cell disorders.
BACKGROUND AND OBJECTIVE Although the finding of trisomy 12 in B-cell malignancies has been extensively documented especially in B-CLL, little is known about the clonal involvement of different tissues and there are few sequential studies documenting the development of trisomy 12 during the course of the disease. The aim of this study was, therefore, to: 1) ascertain the prevalence of trisomy 1...
متن کاملTrisomy 12 is seen within a specific subtype of B-cell chronic lymphoproliferative disease affecting the peripheral blood/bone marrow and co-segregates with elevated expression of CD11a.
In order to delineate the specific morphological and immunophenotypic features of B-cell lymphoproliferative disorders associated with trisomy 12, 172 sequential unselected cases of CD19+CD5+ B-cell disorders, primarily affecting the peripheral blood and bone marrow, were studied. Trisomy 12 was found in 24 cases (13.9%), with all cases morphologically classified as either CLL-PL or CLL-mixed b...
متن کاملSequential fluorescence in situ hybridization analyses for trisomy 12 in chronic leukemic B-cell disorders.
BACKGROUND AND OBJECTIVES Trisomy 12 is one of the most common chromosomal abnormalities in B-cell chronic lymphocytic leukemia (CLL). The aberration is readily detected by fluorescence in situ hybridization (FISH). There are only a few reports in which FISH analyses have been used to study the expansion of the trisomy 12 clone over time. DESIGN AND METHODS Repeat FISH analyses were performed...
متن کاملTrisomy 12 in chronic lymphocytic leukemia: an interphase cytogenetic study.
Interphase cytogenetics by means of in situ hybridization with the chromosome 12-specific biotinylated alpha satellite DNA probe pSP 12-1 was used for the study of trisomy 12, the most common chromosomal abnormality in chronic lymphocytic leukemia. In situ hybridization was performed on methanol/acetic acid fixed cells of conventional cytogenetic preparations from eight patients and on morpholo...
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