Resumo

GARCIA, Marcelo et al. Cryoglobulin with cold agglutinin properties in a patient with splenic marginal zone lymphoma. Acta bioquím. clín. latinoam. [online]. 2015, vol.49, n.4, pp.409-416. ISSN 0325-2957.

The aim of this paper is to describe a case of splenic marginal zone lymphoma (SMZL) with monoclonal component having properties of cryoglobulin and cold agglutinin, a finding of very low frequency. A patient with SMZL suffered autoimmune hemolytic anemia five years after diagnosis, with hematocrit 0.15 L/L, hemoglobin 49 g/L, lactate dehydrogenase 16.82 μkat/L, direct Coombs test with anti-IgG/C3d positive, total bilirubin 90.6 μmol/L and indirect 58.1 μmol/L. She presented no clinical or serological evidence of HIV, hepatitis B or  C infection. Serum protein electrophoresis showed a monoclonal peak of 14 g/L, with positive cryoglobulinemia at 24 hours, and 30% cryocrit. Purified cryoglobulin was type I with a monoclonal IgM-lambda component coincident with that observed in serum. The patient serum, eluate at 37 °C and purified cryoglobulin showed cold agglutinin activity with anti-I specificity, phenomenon produced by the same immunoglobulin. The finding of a cryoglobulin with cold agglutinin properties in patients with SMZL has not been previously described in the literature.

Palavras-chave : Cryoglobulin; Cold agglutinin; Splenic marginal zone lymphoma; Monoclonal gammophaty.

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