Abstract

Abstract. Erythrocyte auto‐antibodies may be associated with lymphomas. We report a case of reticulosarcoma in a patient of A1 blood group phenotype whose direct Coombs test was positive with anti‐IgM and anti‐complement antiglobulins. In serum, a cold antibody of IgM type was detected, which exhibited a monoclonal pattern with Λ‐light chains. Moreover, it was shown to display an unusual auto‐anti‐A1 specificity.

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