Cytogenetic analysis of 363 consecutively ascertained diffuse large B-cell lymphomas - PubMed (original) (raw)
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- PMID: 10337996
Cytogenetic analysis of 363 consecutively ascertained diffuse large B-cell lymphomas
J C Cigudosa et al. Genes Chromosomes Cancer. 1999 Jun.
Abstract
Cytogenetic analysis was performed on 363 biopsy specimens with histologically confirmed diffuse large B-cell lymphoma (DLBCL), consecutively ascertained at the Memorial Sloan-Kettering Cancer Center, New York, between 1984 and 1994. Among 248 samples successfully karyotyped, clonal chromosomal abnormalities were noted in 215 (87%). The salient cytogenetic features of DLBCL from this analysis comprised the following. Breakpoints clustered, in decreasing frequency, at 10 recurring sites: 14q32, 18q21, 1q21, 3q27, 1p36, 8q24, 3p21, 6q21, 1p22, and 22q11. Of these, deletion breaks affecting bands 3p2 and 1p22 and translocation breaks affecting bands 14q32, 3q27, and 1q2 were frequent and distinctive for this subset of lymphomas. Translocations affecting band 14q32 were noted in 110 cases (51%) of which 42 (20%) had t(14;18)(q32;q21), 21 (10%) had t(8;14)(q24;q32) or t(8;22)(q24;q11), 14 (6.5%) had t(3;14)(q27;q32) or t(3;22)(q27;q11), and 33 (15%) had other rearrangements of 14q32. Among 144 new translocations detected in the entire group, the breakpoints in 19 were recurrent and clustered at three sites: 1q21, 3q27, and 14q32. Regions of common cytogenetic deletions were identified at 11 sites, 1p36, 1p33-34, 1p31, 1q32, 3p25-26, 3p21, 3q21, 6q15, 6q21, 6q23-24, and 7q32, suggesting possible loss of candidate tumor suppressor genes associated with DLBCL development. Of these, only those at 6q21, 6q23, and 7q32 have previously been described in lymphoid neoplasms. The group of DLBCL with translocations affecting band 14q32 showed a significantly different pattern of additional cytogenetic changes compared to the group lacking such translocation. This new comprehensive cytogenetic characterization provides the basis for investigations aimed at identifying molecular mechanisms as well as the clinical impact of cytogenetic changes in DLBCL.
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