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Peripheral blood and/or bone marrow lymphoblasts from 34 children and 11 adults with acute lymphoblastic leukemia (ALL) were evaluated with a monoclonal anti-Ia antibody and a monoclonal anti-pan T-cell antibody (T101) specific for a 65,000-dalton T-cell antigen (T65). Seventy-six per cent of cases were Ia+T65-, 20% were Ia-T65+ and the remaining 4% were Ia-T65-. Anti-Ia and T101 reactivity were mutually exclusive and no Ia+T65+ cases were identified. In childhood ALL, the Ia+T65- phenotype was associated with good prognostic factors and longer median disease-free survival than Ia-T65+ patients whose clinical parameters resembled those characteristic of high-risk T-cell ALL. Included in the Ia-T65+ group were three E-rosette negative cases with clinical features of T-cell disease. Our findings compare favorably with the results of other investigators utilizing polyclonal antisera and suggest that these monoclonal antibodies, which offer the advantages of monospecific standardized reagents, will prove useful in the immunologic characterization of ALL.
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