Four cases of pernicious anemia developing in association with multiple myeloma are described. The description now of 14 cases demonstrating the association of these two disorders suggest a causative relationship. These observations, in addition to the previously well-documented increased coincidence of pernicious anemia and benign monoclonal gammopathy and pernicious anemia and hypoglobulinemia, suggest that screening for vitamine B12 deficiency in patients with gammopathies and for protein abnormalities in patients with pernicious anemia is indicated.
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