title: Advances in biology of multiple myeloma: clinical applications.
abstract: There appear to be 2 pathways involved in the early pathogenesis of premalignant monoclonal gammopathy of undetermined significance (MGUS) and malignant multiple myeloma (MM) tumors. Nearly half of these tumors are nonhyperdiploid and mostly have immunoglobulin H (IgH) translocations that involve 5 recurrent chromosomal loci, including 11q13 (cyclin D1), 6p21 (cyclin D3), 4p16 (fibroblast growth factor receptor 3 [FGFR3] and multiple myeloma SET domain [MMSET]), 16q23 (c-maf), and 20q11 (mafB). The remaining tumors are hyperdiploid and contain multiple trisomies involving chromosomes 3, 5, 7, 9, 11, 15, 19, and 21, but infrequently have IgH translocations involving the 5 recurrent loci. Dysregulated expression of cyclin D1, D2, or D3 appears to occur as an early event in virtually all of these tumors. This may render the cells more susceptible to proliferative stimuli, resulting in selective expansion as a result of interaction with bone marrow stromal cells that produce interleukin-6 (IL-6) and other cytokines. There are 5 proposed tumor groups, defined by IgH translocations and/or cyclin D expression, that appear to have differences in biologic properties, including interaction with stromal cells, prognosis, and response to specific therapies. Delineation of the mechanisms mediating MM cell proliferation, survival, and migration in the bone marrow (BM) microenvironment may both enhance understanding of pathogenesis and provide the framework for identification and validation of novel molecular targets.
authors.affiliation: Jerome Lipper Multiple Myeloma Center, Department of Medical Oncology, Dana-Farber Cancer Institute and Harvard Medical School, Boston, MA 02115, USA.
authors.forename: Teru
authors.initials: T
authors.lastname: Hideshima
authors.forename: P Leif
authors.initials: PL
authors.lastname: Bergsagel
authors.forename: W Michael
authors.initials: WM
authors.lastname: Kuehl
authors.forename: Kenneth C
authors.initials: KC
authors.lastname: Anderson
mesh_terms: D016213:Cyclins / Q000235:genetics; D015972:Gene Expression Regulation, Neoplastic / Q000235:genetics*; D005803:Genes, Immunoglobulin / Q000235:genetics; D006801:Humans; D009101:Multiple Myeloma / Q000097:blood / Q000235:genetics* / Q000276:immunology; D009389:Neovascularization, Pathologic / Q000235:genetics; D011379:Prognosis; D014178:Translocation, Genetic / Q000235:genetics; D042461:Vascular Endothelial Growth Factor A
chemical_list: D016213:Cyclins; D042461:Vascular Endothelial Growth Factor A