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  • Title: Ploidy, as detected by fluorescence in situ hybridization, defines different subgroups in multiple myeloma.
    Author: Wuilleme S, Robillard N, Lodé L, Magrangeas F, Beris H, Harousseau JL, Proffitt J, Minvielle S, Avet-Loiseau H, Intergroupe Francophone de Myélome.
    Journal: Leukemia; 2005 Feb; 19(2):275-8. PubMed ID: 15538401.
    Abstract:
    Ploidy appears as an important parameter in both the biology and the clinical evolution of multiple myeloma. However, its evaluation requires either a successful karyotyping (obtained in 30% of the patients) or a DNA index calculation by flow cytometry (not routinely performed in myeloma). We validated a novel method based on interphase fluorescence in situ hybridization that can be utilitized to analyze almost all the patients. The method was very specific and sensitive for the detection of hyperdiploidy. Extended studies showed that most recurrent 14q32 translocations occur in nonhyperdiploid clones, and that deletions of chromosome 13 were less frequently observed in hyperdiploid clones (48 vs 66%). Further large studies are ongoing to evaluate the prognostic value of ploidy in myeloma.
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