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Leukemic blasts from patients with acute nonlymphoid leukemia were examined for the presence of Ig, receptors for IgGFc, and for their capacity to mediate antibody-dependent cellular cytotoxicity (ADCC) against chicken red blood cells (RBC) coated with IgG and spontaneous cell-mediated cytotoxicity (SCMC) against cells of K562 cell line. Leukemic blasts from acute myeloblastic leukemia (AML) patients lacked both Fc receptors and Ig on their surface, had no SCMC activity and majority, but not all of them, lacked ADCC activity. Leukemic blasts from patients with acute monocytic leukemia (AMOL) had Fc receptors, and 50% had IgG on their surface. IgG was cytophilic and appeared not to be directed against cell-surface antigens. This antibody did not interfere with the ADCC activity of leukemic cells. Leukemic blasts from majority of patients with AMOL mediated ADCC, but had no SCMC activity. An association between ADCC and presence of Fc receptor was observed.
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