Monoclonal gammopathy of undetermined significance
小结
定义
Monoclonal gammopathy of undetermined significance (MGUS) is an asymptomatic disorder associated with an increased risk of developing multiple myeloma and related plasma cell proliferative malignancies. The following criteria must be met for diagnosis: presence of a monoclonal (M) protein in the serum (at a concentration <3 g/dL) or in urine (<500 mg per 24 hours); <10% plasma cells in the bone marrow (a bone marrow exam is only required if M protein is >1.5 g/dL, or for non-IgG MGUS, or if the free light chain ratio is abnormal); and an absence of lytic bone lesions, anemia, hypercalcemia, renal insufficiency, or amyloidosis related to the plasma cell proliferative process.[1]
[Figure caption and citation for the preceding image starts]: Hematoxylin-eosin section of bone marrow biopsy showing mild increase in plasma cellsFrom the collection of Ola Landgren, MD, PhD [Citation ends].
[Figure caption and citation for the preceding image starts]: CD138 immunohistochemical staining highlighting small clusters of plasma cellsFrom the collection of Ola Landgren, MD, PhD [Citation ends].
病史和体格检查
关键诊断因素
- at-risk demographic (male, age >50 years, African ancestry)
- clinically asymptomatic
- positive family history
- history of radiation exposure
- history of pesticide exposure
其他诊断因素
- history of immunosuppression or infections
- presence of peripheral neuropathy
危险因素
- male sex
- age >50 years
- African ancestry
- family history of MGUS or multiple myeloma
- immune-mediated conditions
- radiation exposure
- pesticide exposure
诊断性检查
首要检查
- electrophoresis with immunofixation and measurement of serum immunoglobulins
- CBC with differential
- serum calcium
- serum creatinine
- urinalysis and 24-hour urine collection with electrophoresis and immunofixation
- serum free light chains assay
- metastatic bone survey (conventional x-ray or whole body low-dose CT scan)
需考虑的检查
- bone marrow aspiration and/or biopsy
- bone mineral density scan
- MRI scan
- PET scan
治疗流程
confirmed MGUS
撰稿人
作者
Shaji Kumar, MD
Professor of Medicine
Division of Hematology
Mayo Clinic
Rochester
MN
利益声明
SK has received research funding for clinical trials to the institution from Abbvie, Amgen, Allogene, Astra-Zeneca, BMS, Carsgen, GSK, Janssen, Novartis, Roche-Genentech, Takeda and Regeneron. SK has participated in consulting and advisory board activities (with no personal payments) for Abbvie, Amgen, BMS, Janssen, Roche-Genentech, Takeda, Astra-Zeneca, Bluebird Bio, Secura Biotherapeutics, Trillium, Loxo Oncology, K36, Sanofi, ArcellX, and (with personal payment) Oncopeptides, Beigene and Antengene.
鸣谢
Professor Shaji Kumar would like to gratefully acknowledge Dr Ola Landgren, a previous contributor to this topic.
利益声明
OL is an author of several references cited in this topic.
同行评议者
Daniel Catovsky, MD
Consultant Haemato-Oncologist
Section of Haemato-Oncology
Brookes Lawley Institute of Cancer
Sutton
UK
利益声明
DC declares that he has no competing interests.
Peer reviewer acknowledgements
BMJ Best Practice topics are updated on a rolling basis in line with developments in evidence and guidance. The peer reviewers listed here have reviewed the content at least once during the history of the topic.
Disclosures
Peer reviewer affiliations and disclosures pertain to the time of the review.
参考文献
关键文献
Rajkumar SV, Dimopoulos MA, Palumbo A, et al. International Myeloma Working Group updated criteria for the diagnosis of multiple myeloma. Lancet Oncol. 2014 Nov;15(12):e538-48.全文 摘要
van de Donk NW, Palumbo A,R Johnsen HE, et al. The clinical relevance and management of monoclonal gammopathy of undetermined significance and related disorders: recommendations from the European Myeloma Network. Haematologica. 2014 Jun;99(6):984-96.全文 摘要
Bird J, Behrens J, Westin J, et al. UK Myeloma Forum (UKMF) and Nordic Myeloma Study Group (NMSG): guidelines for the investigation of newly detected M-proteins and the management of monoclonal gammopathy of undetermined significance (MGUS). Br J Haematol. 2009 Oct;147(1):22-42.全文 摘要
Kyle RA, Durie BG, Rajkumar SV, et al; International Myeloma Working Group. Monoclonal gammopathy of undetermined significance (MGUS) and smoldering (asymptomatic) multiple myeloma: IMWG consensus perspectives risk factors for progression and guidelines for monitoring and management. Leukemia. 2010 Jun;24(6):1121-7.全文 摘要
参考文献
A full list of sources referenced in this topic is available to users with access to all of BMJ Best Practice.
鉴别诊断
- Multiple myeloma or smoldering myeloma
- Amyloidosis
- Waldenström macroglobulinemia
更多 鉴别诊断指南
- International Myeloma Working Group updated criteria for the diagnosis of multiple myeloma
- The clinical relevance and management of monoclonal gammopathy of undetermined significance and related disorders
更多 指南患者教育信息
Monoclonal gammopathy of undetermined significance
更多 患者教育信息
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