Multiple chromosomal and genetic abnormalities have been described in MGUS, SMM and MM, and are thought to beimportant for disease pathogenesis and disease progression. The two most common abnormalities are translocationsinvolving the immunoglobulin heavy chain locus (IgH) and aneuploidy. We and others have recently found that certaincytogenetic abnormalities have specific association patterns allowing for the cytogenetic subclassification of the disease.This has allowed the paradigm change that states that MM is not one disease, but rather several, that may be bestdiscerned according to the underlying cytogenetic aberrations. We question; Can we establish that IgH translocations are seminal events in the pathogenesis of some patients with MGUS andMM? Can we better describe the transcriptional upregulation consequences of the IgH translocations? Can the study of MGUS and MM cytogenetics further elucidate pathogenic pathways for the disease? Do patients that develop MGUS and MM have an underlying susceptibility to acquire IgH translocations?SPECIFIC AIM 1: We wish to validate the biologic importance of IgH translocations for the pathogenesis of PCneoplasms. To do this we propose to determine the actual proportion of PCs in MGUS that share signature IgHtranslocation using simultaneous clg-FISH and ASO mRNA FISH. We also wish to establish the persistence, andpotential expansion of PCs with IgH translocations in serial samples of MGUS/MM and subclones of the human MM celllinesSPECIFIC AIM 2: We will determine whether there are genetic subcategories of MGUS as in MM, Le. hyperdiploid andnon-hyperdiploid MGUS. To do so we proposed detailed description of the disease using interphase FISH and byperforming supervised clustering analysis of the gene expression profiles of MGUS and MM according to thecytogenetic category; primary IgH translocations, secondary IgH translocations and no IgH translocations.
SPECIFIC AIM 3 : Lastly we believe there is a possibility of inherent predisposition to IgH translocations in patients withMGUS and MM with IgH translocations. To find whether such a propensity exist we propose to use surrogate markersof DNA repair problems in patients at risk for MGUS and MM. We will then study the peripheral blood of patients withvarious PC proliferative disorders to detect and quantify 19HIbcl-2 PCR products.
|Gonsalves, W I; Rajkumar, S V; Dispenzieri, A et al. (2017) Quantification of circulating clonal plasma cells via multiparametric flow cytometry identifies patients with smoldering multiple myeloma at high risk of progression. Leukemia 31:130-135|
|Mullikin, Trey C; Rajkumar, S Vincent; Dispenzieri, Angela et al. (2016) Clinical characteristics and outcomes in biclonal gammopathies. Am J Hematol 91:473-5|
|Gonsalves, Wilson I; Timm, Michael M; Rajkumar, S Vincent et al. (2016) The prognostic significance of CD45 expression by clonal bone marrow plasma cells in patients with newly diagnosed multiple myeloma. Leuk Res 44:32-9|
|Kaufman, Gregory P; Dispenzieri, Angela; Gertz, Morie A et al. (2015) Kinetics of organ response and survival following normalization of the serum free light chain ratio in AL amyloidosis. Am J Hematol 90:181-6|
|Gonsalves, W I; Leung, N; Rajkumar, S V et al. (2015) Improvement in renal function and its impact on survival in patients with newly diagnosed multiple myeloma. Blood Cancer J 5:e296|
|Greenberg, A J; Rajkumar, S V; Therneau, T M et al. (2014) Relationship between initial clinical presentation and the molecular cytogenetic classification of myeloma. Leukemia 28:398-403|
|Gonsalves, Wilson I; Morice, William G; Rajkumar, Vincent et al. (2014) Quantification of clonal circulating plasma cells in relapsed multiple myeloma. Br J Haematol 167:500-5|
|Teoh, P J; Chung, T H; Sebastian, S et al. (2014) p53 haploinsufficiency and functional abnormalities in multiple myeloma. Leukemia 28:2066-74|
|Gonsalves, W I; Rajkumar, S V; Gupta, V et al. (2014) Quantification of clonal circulating plasma cells in newly diagnosed multiple myeloma: implications for redefining high-risk myeloma. Leukemia 28:2060-5|
|Egan, Jan B; Barrett, Michael T; Champion, Mia D et al. (2014) Whole genome analyses of a well-differentiated liposarcoma reveals novel SYT1 and DDR2 rearrangements. PLoS One 9:e87113|
Showing the most recent 10 out of 364 publications