Smoldering multiple myeloma (SMM) is a precancerous condition that sits between MGUS (a milder plasma cell disorder) and active multiple myeloma. It involves higher-than-normal levels of abnormal plasma cells and M protein in the blood, but crucially — no symptoms or organ damage yet.
Think of it as myeloma that hasn't Show Full Answer
Smoldering multiple myeloma (SMM) is a precancerous condition that sits between MGUS (a milder plasma cell disorder) and active multiple myeloma. It involves higher-than-normal levels of abnormal plasma cells and M protein in the blood, but crucially — no symptoms or organ damage yet.
Think of it as myeloma that hasn't "woken up" yet. Because SMM has no symptoms, it's usually picked up through blood tests. The risk of it progressing to active myeloma decreases over time:
- First 5 years: ~10% chance per year of progression
- Years 5–10: drops to ~3% per year
- After 10 years: around 1% per year
So the earlier after diagnosis, the closer monitoring matters most. Certain factors can increase the risk of SMM progressing, including:
- High levels of M protein (or rising M protein over time)
- High numbers of plasma cells in the bone marrow
- Specific gene changes in plasma cells
- Bone lesions visible on imaging
- M protein made from IgA rather than IgG
It's worth discussing these risk factors with a doctor to understand where things stand personally. For high-risk SMM, early treatment is now generally recommended. For lower-risk cases, careful monitoring with regular blood tests and check-ups is a common approach. The goal is to catch any progression early and act quickly if needed.
August 8
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