title: Pathogenesis beyond the cancer clone(s) in multiple myeloma.
abstract: Over the past 4 decades, basic research has provided crucial information regarding the cellular and molecular biology of cancer. In particular, the relevance of cancer microenvironment (including both cellular and noncellular elements) and the concept of clonal evolution and heterogeneity have emerged as important in cancer pathogenesis, immunologic escape, and resistance to therapy. Multiple myeloma (MM), a cancer of terminally differentiated plasma cells, is emblematic of the impact of cancer microenvironment and the role of clonal evolution. Although genetic and epigenetic aberrations occur in MM and evolve over time under the pressure of exogenous stimuli, they are also largely present in premalignant plasma cell dyscrasia such as monoclonal gammopathy of undetermined significance (MGUS) and smoldering multiple myeloma (SMM), suggesting that genetic mutations alone are necessary, but not sufficient, for myeloma transformation. The role of bone marrow microenvironment in mediating survival, proliferation, and resistance to therapy in myeloma is well established; and although an appealing speculation, its role in fostering the evolution of MGUS or SMM into MM is yet to be proven. In this review, we discuss MM pathogenesis with a particular emphasis on the role of bone marrow microenvironment.
authors.affiliation: Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA; and.
authors.forename: Giada
authors.initials: G
authors.lastname: Bianchi
authors.affiliation: Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA; and Veterans Affairs Boston Healthcare System, West Roxbury, MA.
authors.forename: Nikhil C
authors.initials: NC
authors.lastname: Munshi
mesh_terms: D000818:Animals; D002471:Cell Transformation, Neoplastic; D060833:Cellular Microenvironment; D060965:Clonal Evolution; D006801:Humans; D009101:Multiple Myeloma / Q000209:etiology* / Q000473:pathology
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