Concerning related hematological disorders, 15 patients had MGUS IgM (51.7%), 8 had Waldenström's Macroglobulinemia (27.6%), 2 had Chronic Lymphoproliferative Syndrome consistent with a low-grade B-cell lymphoproliferative disorder (6.9%), 2 had MGUS IgG (6.9%), 1 had non-Hodgkin lymphoma (3.4%), and 1 had Chronic Lymphatic Leukemia (3.4%). The gene discussed is CD40LG; the disease is non-Hodgkin lymphoma.