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International Myeloma Working Group (IMWG) Molecular Classification of Multiple Myeloma

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The intent of this statement is to provide a biological classification of multiple myeloma and to establish the prognostic value of known genetic factors. Myeloma is divided at the highest genetic level into two subtypes: disease that is hyperdiploid (h-MM), and disease that is non-hyperdiploid (nh-MM). The non-hyperdiploid type is characterized by immunoglobulin heavy-chain (IgH) translocations and is generally associated with more aggressive disease and shorter survival. Accurate prognostic determination of disease course allows for a more rational selection and sequencing of therapy approaches and more direct discussion with the patient regarding disease threat. Risk stratification is essential for better understanding of the composition of patients in clinical trials, and […]

International Myeloma Working Group molecular classification of multiple myeloma: spotlight review

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Myeloma is a malignant proliferation of monoclonal plasma cells. Although morphologically similar, several subtypes of the disease have been identified at the genetic and molecular level. These genetic subtypes are associated with unique clinico- pathological features and dissimilar outcome. At the top hierarchical level, myeloma can be divided into hyperdiploid and non-hyperdiploid subtypes. The latter is mainly composed of cases harboring IgH translocations, generally associated with more aggressive clinical features and shorter survival. The three main IgH translocations in myeloma are the t(11;14)(q13;q32), t(4;14)(p16;q32) and t(14;16)(q32;q23). Trisomies and a more indolent form of the disease characterize hyperdiploid myeloma. A number of genetic progression factors have been identified including deletions of […]