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  • Title: Familial Waldenstrom's macroglobulinemia and relation to immune defects, autoimmune diseases, and haematological malignancies--A population-based study from northern Sweden.
    Author: Brandefors L, Kimby E, Lundqvist K, Melin B, Lindh J.
    Journal: Acta Oncol; 2016; 55(1):91-8. PubMed ID: 26559865.
    Abstract:
    BACKGROUND: Waldenstrom's macroglobulinemia (WM) is a rare lymphoprolipherative disorder with geographic and ethnic disparities in incidence. The cause of WM remains mostly unknown although a role for genetic, immune-related, and environmental factors has been suggested. Most cases of WM are sporadic although familial cases occur. AIM: This study estimated the incidence of WM in northern Sweden and identified and described patients with familial WM in this area. PATIENTS AND METHODS: The Swedish and Northern Lymphoma Registry, the Swedish Cancer Registry (1997-2011), and medical records were used to identify patients with WM in two counties (Norrbotten and Västerbotten) in northern Sweden and to calculate the overall age-adjusted incidence (2000-2012). We identified 12 families with a family history of WM, IgM monoclonal gammophathy (MGUS), and/or multiple myeloma (MM). RESULTS: In Norrbotten and Västerbotten, the age-adjusted incidence of WM/LPL is 1.75 and 1.48 per 100,000 persons per year, respectively (2000-2012), rates that are higher than the overall incidence of WM/LPL in Sweden (1.05 per 100,000 persons per year; 2000-2012). Autoimmune diseases and other haematological malignancies in the medical history (their own or in relatives) were reported in 9/12 and 5/12 families, respectively. A high proportion of abnormal serum protein electrophoresis was found in the relatives; 12/56 (21%) had a MGUS and 13/56 (25%) showed abnormalities in the immunoglobulin levels (i.e. subnormal levels and poly/oligoclonality). CONCLUSION: The incidence of WM in Norrbotten and Västerbotten counties was higher than expected. We found a strong correlation between autoimmune/inflammatory diseases, other haematological malignancies, and familial WM and a high frequency of serum immunoglobulin abnormalities in the relatives of the WM patients, findings that strengthen the hypothesis that the aetiology of WM depends on both immune-related and genetic factors.
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