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Biotechnical Methods Section (BTS)

Ploidy, as detected by fluorescence in situ hybridization, defines different subgroups in multiple myeloma


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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This study has been supported by a grant from the Ligue contre le Cancer, and by a Programme Hospitalier de Recherche Clinique.

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Correspondence to H Avet-Loiseau.

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Wuilleme, S., Robillard, N., Lodé, L. et al. Ploidy, as detected by fluorescence in situ hybridization, defines different subgroups in multiple myeloma. Leukemia 19, 275–278 (2005).

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  • myeloma
  • FISH
  • ploidy
  • DNA index
  • cytogenetics

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