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Neuropathy in benign monoclonal gammopathy — Clinical Guidelines

Overview

Monoclonal gammopathy (MG) encompasses a spectrum of plasma cell disorders characterized by the production of monoclonal proteins (M-proteins). Benign forms, such as monoclonal gammopathy of undetermined significance (MGUS), may progress to more severe conditions like multiple myeloma or cause organ-specific complications like neuropathy through light-chain deposition.

Diagnosis

Key Diagnostic Criteria: Presence of M-protein in serum or urine, typically <3 g/dL in MGUS 4.

Recommended Tests:

- Serum protein electrophoresis (SPE) and immunofixation electrophoresis (IFE) 5. - Quantitative measurement of free light chains (FLCs) 8. - Serum and urine immunochemical assays for precise quantification 8.

Grading: Risk stratification based on serum M-protein level, bone marrow plasma cell percentage, and genetic markers 4.

Management

First-Line: Regular monitoring for progression to symptomatic disease 4.

Adjunctive Treatments: Specific treatments depend on complications; for neuropathy, management focuses on addressing underlying light-chain deposition or other organ-specific issues 7.

No Specific Drug Doses Mentioned: Management primarily revolves around surveillance and supportive care 4.

Special Populations

Elderly: Increased prevalence of MGUS; careful monitoring for progression is crucial 4.

Comorbidities: Hyperlipidemia can coexist with MG, particularly with IgG1 monoclonal gammopathy 10.

Key Recommendations

Regular Monitoring for MGUS Patients: Annual assessments including serum and urine protein electrophoresis, FLC ratios, and bone marrow evaluation to detect progression 4 (Evidence: Strong).

Use of Advanced Techniques for M-Protein Quantification: Employ serum protein electrophoresis, immunofixation, and FLC assays for accurate diagnosis and monitoring 5 8 (Evidence: Moderate).

Risk Stratification Based on Clinical and Laboratory Parameters: Incorporate M-protein level, bone marrow plasma cell percentage, and genetic factors for risk stratification 4 (Evidence: Strong).

References

1 Agulló C, Puig N, Varo N, Iglesias MÁ, Mugueta C, Pello R et al.. Recommendations for the study of monoclonal gammopathies in the clinical laboratory. A consensus of the Spanish Society of Laboratory Medicine and the Spanish Society of Hematology and Hemotherapy. Part III: Clinical and analytical recommendations for the study of monoclonal gammopathies by MALDI-TOF mass spectrometry. Clinical chemistry and laboratory medicine 2026. link 2 Nasr SH, Royal V, Best Rocha A, Büttner-Herold M, Roufosse C, Bridoux F et al.. Renal Pathology Society/International Kidney and Monoclonal Gammopathy Research Group consensus on pathologic definitions and terminology of monoclonal gammopathy-associated kidney lesions. Kidney international 2025. link 3 Cárdenas MC, García-Sanz R, Puig N, Pérez-Surribas D, Flores-Montero J, Ortiz-Espejo M et al.. Recommendations for the study of monoclonal gammopathies in the clinical laboratory. A consensus of the Spanish Society of Laboratory Medicine and the Spanish Society of Hematology and Hemotherapy. Part I: Update on laboratory tests for the study of monoclonal gammopathies. Clinical chemistry and laboratory medicine 2023. link 4 Stern S, Chaudhuri S, Drayson M, Henshaw S, Karunanithi K, Willis F. Investigation and management of the monoclonal gammopathy of undetermined significance: A British Society for Haematology Good Practice Paper. British journal of haematology 2023. link 5 Genzen JR, Murray DL, Abel G, Meng QH, Baltaro RJ, Rhoads DD et al.. Screening and Diagnosis of Monoclonal Gammopathies: An International Survey of Laboratory Practice. Archives of pathology & laboratory medicine 2018. link 6 Gertz M, Buadi FK. Case vignettes and other brain teasers of monoclonal gammopathies. Hematology. American Society of Hematology. Education Program 2012. link 7 Merlini G, Palladini G. Differential diagnosis of monoclonal gammopathy of undetermined significance. Hematology. American Society of Hematology. Education Program 2012. link 8 Nakano T, Miyazaki S, Takahashi H, Matsumori A, Maruyama T, Komoda T et al.. Immunochemical quantification of free immunoglobulin light chains from an analytical perspective. Clinical chemistry and laboratory medicine 2006. link 9 Bossuyt X, Vranken G, Mariën G, Blanckaert N. Monoclonal IgM: difficulties with correct measurement. Annals of clinical biochemistry 2001. link 10 Zadák Z, Tichý M. Hyperlipidemia and monoclonal gammapathy. Neoplasma 1987. link 11 Ebers GC, Rice GP, Armstrong H. Preparative isoelectric focusing in agarose. Journal of immunological methods 1980. link90317-8)

Neuropathy in benign monoclonal gammopathy