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Medline ® Abstract for Reference 19

of 'Clinical presentation and diagnosis of non-Hodgkin lymphoma'

Increased risks of lymphoma and death among patients with non-hepatitis C virus-related mixed cryoglobulinemia.
Saadoun D, Sellam J, Ghillani-Dalbin P, Crecel R, Piette JC, Cacoub P
Arch Intern Med. 2006;166(19):2101.
BACKGROUND: Data on essential mixed cryoglobulinemia (MC) are scarce, and most date back to studies before 1989 (ie, before the discovery of hepatitis C virus [HCV]infection). Our objective was to describe the spectrum of MC in the era of HCV infection.
METHODS: Retrospective study from a single university hospital's database of 1434 patients who tested positive for MC between January 1989 and December 2003.
RESULTS: One hundred thirty-three patients (9%) with persistent MC without HCV were included in the study. Sixty-five of 133 patients who fulfilled the criteria for MC vasculitis were compared with 118 patients with HCV-related MC vasculitis. The patients without HCV had increased frequencies of renal involvement and B-cell non-Hodgkin lymphoma (NHL), lower gammaglobulin levels, and higher death rates. Twenty-three of the patients had B-cell NHL (primarily of the lymphoplasmocytic and marginal zone types), and 8 patients had Sjögren syndrome. In multivariate analysis, a cryoglobulin level higher than 0.6 g/L (odds ratio [OR], 1.44) and the presenceof MC vasculitis (OR, 4.3) and hypogammaglobulinemia (OR, 6.7) were independently associated with B-cell NHL. After a mean follow-up of 49.4 months, 18 (14%) of 133 patients had died, primarily of sepsis. In multivariate analysis, age at diagnosis older than 60 years (OR, 1.06) and renal involvement (OR, 5.20) were independently associated with death.
CONCLUSION: Patients with non-HCV-related MC vasculitis have a poor outcome and have a 4-fold increased risk of developing B-cell NHL.
Department of Internal Medicine, Centre National de la Recherche Scientific UnitéMixte de Recherche 7087, Paris, France.