title: A single monoclonal antibody identifies T-cell lineage of childhood lymphoid malignancies.
abstract: Immunophenotyping studies with monoclonal antibodies have revealed the heterogeneity of childhood acute lymphoblastic leukemia (ALL) and non-Hodgkin's lymphoma (NHL). The lymphoid malignancies of T-cell lineage are particularly heterogeneous and, until now, no single monoclonal antibody has been found to identify all cases of T-ALL and T-NHL. A monoclonal antibody, 4H9, recognizes an antigen of 40,000 molecular weight on normal and malignant T cells. Thirty-six cases of childhood T-ALL and T-NHL were tested, and in all cases, the malignant blast cells were reactive with 4H9, whereas malignant cells from 61 cases of non-T ALL and NHL were not reactive with 4H9. Monoclonal antibody 4H9 is a sensitive and specific reagent for the identification of childhood T-cell ALL and NHL and should be extremely useful in immunophenotyping studies of lymphoid malignancies.
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology*; D006801:Humans; D007945:Leukemia, Lymphoid / Q000235:genetics / Q000276:immunology*; D008223:Lymphoma / Q000235:genetics / Q000276:immunology*; D010641:Phenotype; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal