Both MGUS and Waldenström's macroglobulinemia (WM) involve abnormal plasma cells that produce M protein, but they differ in important ways.
MGUS is a non-cancerous condition where abnormal plasma cells produce small amounts of M protein. It rarely causes symptoms and is monitored rather than treated. There is a small Show Full Answer
Both MGUS and Waldenström's macroglobulinemia (WM) involve abnormal plasma cells that produce M protein, but they differ in important ways.
MGUS is a non-cancerous condition where abnormal plasma cells produce small amounts of M protein. It rarely causes symptoms and is monitored rather than treated. There is a small chance (about 1% per year) it could progress to myeloma.
Waldenström's macroglobulinemia is an actual cancer, specifically involving a type of cell called lymphoplasmacytoid lymphoma cells. It is more serious than MGUS and requires active treatment. Here are some key differences:
- Cell type: MGUS involves abnormal plasma cells; WM involves lymphoplasmacytoid lymphoma cells
- Cancer status: MGUS is non-cancerous; WM is a cancer
- Symptoms: MGUS rarely causes symptoms; WM can cause more significant health issues
- Treatment: MGUS typically requires monitoring only; WM requires active treatment, often with a drug called rituximab combined with other medications
A key genetic difference is that about 90% of WM cases carry a specific gene mutation (MYD88 L265P), which is rarely seen in myeloma-related conditions. This helps doctors tell them apart.
It's always worth discussing these distinctions with your specialist to understand how they relate to your specific situation.
June 18
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