Abstract
This study evaluates newly diagnosed IgM (6%, n = 75/1174) vs. non-IgM light chain amyloidosis patients. IgM amyloid patients had lower light chains (12.5 vs. 22.5 mg/dL; p < 0.001). Heart (56% vs. 73%, p = 0.002) and >1 organ involvement (31% vs. 44%, p = 0.02) was less common in IgM amyloidosis, while soft tissue and peripheral nerve involvement was more common. t(11;14) was less common (27% vs. 50%, p = 0.008) in IgM amyloidosis. Rates of MYD88L265P and CXCR4WHIM mutation in IgM amyloidosis were 58% (29/50) and 17% (8/46). Diagnosis after hematopathology review in IgM amyloidosis was pure plasma cell neoplasm (PPCN) in 23% (16/70), lymphoplasmacytic neoplasm (LPL) in 63% (44/70) patients, and other (14%). LPL vs. PPCN groups had distinct genetic abnormalities: t(11;14): 0% (0/18) vs. 60% (9/15), p < 0.001; MYD88L265P mutation: 84% (27/32) vs. 0% (0/14), p < 0.001; CXCR4 mutation: 29% (8/28) vs. 0% (0/14), p = 0.04. Overall survival was shorter in IgM AL when stratified by Mayo 2012 stage; stage 1/2 (59 vs. 125.9 months, p = 0.003) and stage 3/4 (6.5 vs. 12.9 months, p = 0.075), likely due to lower hematologic response rates (6 months: 39% vs. 59%, p = 0.008). We characterized two subtypes of IgM amyloidosis (LPL/PPCN). This can aid in therapeutic decision-making, with treatment directed at the clonal disease.
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Acknowledgements
We would like to acknowledge Ms Kim Henderson and Ms Katie Halverson for their assistance in testing stored biospecimens.
Funding
Katherine McCleary Research Fund and K. Edward Jacobi Research Partners Fund of the International Waldenström’s Macroglobulinemia Foundation; Amyloidosis Foundation.
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SS and MAG designed the study, collected the data, performed the analysis, and wrote the first draft of the manuscript. RLK and DL reviewed and analyzed the hematopathology data. PTG supervised FISH testing on cryopreserved bone marrow aspirates. RH supervised MYD88 and CXCR4 mutation testing on cryopreserved bone marrow aspirates. EDM supervised mass spectrometry testing on archival samples. EDM and SD reviewed mass spectrometry testing. All authors critically reviewed the manuscript.
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SS: Consultancy: Janssen. AD: research funding from Celgene, Takeda, Prothena, Janssen, Pfizer, Alnylam, and GSK. PK: research funding from Celgene and Takeda. MQL: research funding from Celgene. SKK: research funding and membership on an entity’s Board of Directors or advisory committees: AbbVie, Celgene, Janssen, KITE, and Merck. Membership on an entity’s Board of Directors or advisory committees: Oncopeptides and Takeda. Research funding from Novartis and Roche. MAG: honoraria/consultancy from Ionis, Alnylam, Prothena, Celgene, Janssen, Spectrum, Annexon, Apellis, Amgen, Medscape, Abbvie, Research to Practice, Physicians Education Resource, and Teva. The other authors declare that they have no conflict of interest.
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Sidana, S., Larson, D.P., Greipp, P.T. et al. IgM AL amyloidosis: delineating disease biology and outcomes with clinical, genomic and bone marrow morphological features. Leukemia 34, 1373–1382 (2020). https://doi.org/10.1038/s41375-019-0667-6
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DOI: https://doi.org/10.1038/s41375-019-0667-6
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