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  • Review Article
  • Published:

Minimal residual disease in multiple myeloma: bringing the bench to the bedside

Key Points

  • Outcomes of patients with multiple myeloma have improved substantially in the past decade

  • A large proportion of patients achieve a complete response to current therapies

  • More-sensitive assays for the detection of MRD are required

  • Standardization and guidelines on the use of MRD testing in clinical trials and in the clinic are required

Abstract

Outcomes for patients with multiple myeloma (MM) have improved substantially in the past decade, with improvements in both progression-free survival and overall survival. Many patients are now achieving a complete response to treatment, and consequently highly sensitive assays are needed for detection of minimal residual disease (MRD) in patients with MM. Results of multicolour flow cytometry and deep-sequencing studies suggest that among patients achieving a complete response, MRD-negative status is associated with significant improvements in progression-free survival and overall survival. Despite the increasing need for MRD testing in patients with MM, considerable heterogeneity in techniques for MRD detection hinders the clinical interpretation of their results. The criteria used to define MRD, strengths and weaknesses of the major types of tests (flow cytometry versus molecular testing), and the optimal sample type (bone marrow aspirate versus peripheral blood) are all unresolved dilemmas in MRD testing. This Review presents an overview of the various techniques for MRD detection in patients with MM. In addition, this article discusses challenges and opportunities for the routine use of MRD testing, possible future directions for clinical trials and implications for drug approval processes.

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Figure 1: Treatment response rates achieved with commonly used induction regimens in patients with MM.
Figure 2: Flow cytometry testing for minimal residual disease in patients with treated multiple myeloma.
Figure 3: Effect of sample size on flow cytometry testing for minimal residual disease in treated patients with multiple myeloma.

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Acknowledgements

S.M. and M.S.-S. gratefully acknowledge support from the Intramural Research Program of the National Cancer Institute, Bethesda, MD, USA.

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Contributions

S.M., N.K., M.S.-S. and O.L. researched the data for the article. S.M. and O.L. wrote the manuscript. All authors contributed to discussions of content, and reviewing and editing the manuscript before submission.

Corresponding author

Correspondence to Ola Landgren.

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Competing interests

O.L. declares that he has acted as a consultant for BMJ Publishing, Celgene, Millennium, Medscape, and Onyx. The other authors declare no competing interests.

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Mailankody, S., Korde, N., Lesokhin, A. et al. Minimal residual disease in multiple myeloma: bringing the bench to the bedside. Nat Rev Clin Oncol 12, 286–295 (2015). https://doi.org/10.1038/nrclinonc.2014.239

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  • DOI: https://doi.org/10.1038/nrclinonc.2014.239

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