High incidence of chromosome 13 deletion in multiple myeloma detected by multiprobe interphase FISH

Blood - Tập 96 Số 4 - Trang 1505-1511 - 2000
John D. Shaughnessy1, Erming Tian2, Jeffrey R. Sawyer2, Klaus Bumm2, Reid D. Landes2, Ashraf Badros2, Christopher Morris2, Guido Tricot2, Joshua Epstein2, Bart Barlogie2
1Myeloma and Transplantation Research Center, Division of Biometry, University of Arkansas for Medical Sciences and Arkansas Cancer Research Center, Little Rock, AR 72205, USA.
2From the Myeloma and Transplantation Research Center, Division of Biometry, University of Arkansas for Medical Sciences and Arkansas Cancer Research Center, Little Rock, AR

Tóm tắt

Abstract Multiple myeloma (MM) is a hypoproliferative malignancy yielding informative karyotypes in no more than 30% of newly diagnosed cases. Although cytogenetic and molecular deletion of chromosome 13 is associated with poor prognosis, a MM tumor suppressor gene (TSG) has not been identified. To localize a minimal deleted region of chromosome 13, clonotypic plasma cells from 50 consecutive patients with MM were subjected to interphase fluorescence in situ hybridization (FISH) analysis using a panel of 11 probes spanning the entire long arm of chromosome 13. Whereas chromosome 13 abnormalities were absent in plasma cells from 25 normal donors, 86% of patients with MM demonstrated such aberrations. Heterogeneity, both in deletion frequency and extent, was confirmed by simultaneous FISH with 2 chromosome 13 probes. Deletion hot spots were noted at D13S272 (70%) and D13S31 (64%), 2 unlinked loci at 13q14. Homozygous deletions at these loci occurred in 12% (simultaneously in 8%) of the cases. Molecular deletions were found in all 14 patients with morphologic deletions, in 21 of 24 with uninformative karyotypes, and 8 of 12 patients with karyotype abnormalities lacking chromosome 13 deletion. Homozygous deletion of any marker was noted in 4% with low and in 36% with higher plasma cell labeling index greater than 0.4% (P = .01). The absence of increasing deletion incidence and extent with therapy duration suggests that the observed lesions are not induced by treatment. The high incidence and extent of chromosome 13 deletions require the correlation of specific deletion(s) with poor prognosis. These analyses will provide valuable guidance toward cloning of an MM-TSG.

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Blood

Tập 96 Số 4

1505-1511

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