Minimal residual disease in multiple myeloma.

Minimal Residual Disease (MRD) in multiple myeloma has emerged as a significant prognostic factor, guiding treatment strategies and enhancing patient outcomes. Despite advancements in therapies such as proteasome inhibitors, immunomodulatory drugs, monoclonal antibodies, CAR-T cell therapy, and bispecific antibodies, complete eradication of malignant plasma cells remains challenging. MRD refers to a small number of residual cancer cells that persist after treatment and require sensitive methods like next-generation flow cytometry (NGF) and next-generation sequencing (NGS) for detection. MRD negativity has been associated with improved progression-free survival (PFS) and overall survival (OS), making it a key marker in clinical trials. The clinical utility of MRD lies in its ability to predict outcomes, with sustained MRD negativity linked to prolonged survival. Furthermore, it will likely help in tailoring treatment approaches, such as therapy escalation for high-risk patients or de-escalation for those achieving MRD negativity. Despite its prognostic value, challenges remain in standardizing MRD testing, ensuring its widespread availability, and addressing variability in results based on different detection methods. Future research aims to refine MRD-guided treatment and explore novel detection techniques, such as liquid biopsies, to improve patient monitoring in multiple myeloma.