“Waldenstrom’s macroglobulinemia (WM) is a lymphoma, or cancer of the lymphatic system. It is sometimes referred to as a lymphoplasmacytic lymphoma (LPL) with an associated monoclonal IgM paraprotein. The disease occurs in a type of white blood cell called a B-lymphocyte or B-cell, which normally matures into a plasma cell whose job is to manufacture immunoglobulins (antibodies) to help the body fight infection.”

IWMF International Waldenstrom’s Macroglobulemia Foundation (https://www.iwmf.com/about-wm/newly-diagnosed)