[Usefulness of plasma cell acid phosphatase in the differential diagnosis of monoclonal gammopathies].

The acid phosphatase activity has been studied cytochemically in bone marrow plasma cells of 12 patients with multiple myeloma and 15 with non-myeloma plasmocytosis. The acid phosphatase activity has been significantly higher in the myeloma group. The utilization and usefulness of this cytochemical reaction for the diagnosis of multiple myeloma are proposed.