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[Multiple primary neoplasms in patients with multiple myeloma and primary macroglobulinemia].

A review of 65 patients with multiple myeloma (MM) and 10 patients with primary macroglobulinemia (PM) seen at our clinic from 1972 through 1988 revealed further cancers that were found in 11 patients with MM and in 2 patients with PM. In 4 of 13 patients with multiple primary neoplasms, either MM or PM was an antecedent. In 6 patients, MM or PM was coincident with the cancers. In 3 patients, the cancer was antecedent. Only one patient with multiple myeloma developed secondary leukemia following treatment with alkylating agents.