title: Myeloid antigen expression on common acute lymphatic leukaemia blasts after culture.
abstract: Blast cells from seven out of ten patients with common acute lymphoblastic leukaemia (cALL) developed the myeloid antigen MY7 (CD13) after culture, and one of these coexpressed the myeloid antigen MY9 (CD33). CD13 expression appeared to be independent of maturation since it could be induced more readily in cultures which did not contain the differentiation promoter 12-O-tetradecanoyl-phorbol 13 acetate (TPA). CD13 expression in culture was not seen on one null ALL, or 6 B-CLL investigated or on normal tonsillar B cells or PBMC under similar conditions. CD13 expression on cALL blasts probably represents evidence of abnormal gene expression in the leukaemic cells. However the absence of CD13 expression on the earlier B null ALL or the later B-CLL suggests we cannot exclude the possibility that CD13 expression is a feature of normal precursor B cells.
authors.affiliation: Department of Haematology, Trinity College, Dublin, Ireland.
authors.forename: E
authors.initials: E
authors.lastname: Lawlor
authors.forename: C
authors.initials: C
authors.lastname: Blaney
authors.forename: A
authors.initials: A
authors.lastname: Whelan
authors.forename: T
authors.initials: T
authors.lastname: Finn
authors.forename: S R
authors.initials: SR
authors.lastname: McCann
authors.forename: I J
authors.initials: IJ
authors.lastname: Temperley
mesh_terms: D000328:Adult; D000943:Antigens, Differentiation / Q000032:analysis*; D015214:Antigens, Differentiation, Myelomonocytic / Q000032:analysis*; D000951:Antigens, Neoplasm / Q000032:analysis*; D002471:Cell Transformation, Neoplastic / Q000032:analysis / Q000187:drug effects / Q000473:pathology; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D008875:Middle Aged; D015260:Neprilysin; D015452:Precursor B-Cell Lymphoblastic Leukemia-Lymphoma / Q000276:immunology* / Q000473:pathology; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000276:immunology / Q000473:pathology; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014407:Tumor Cells, Cultured / Q000032:analysis / Q000276:immunology* / Q000473:pathology
chemical_list: D000943:Antigens, Differentiation; D015214:Antigens, Differentiation, Myelomonocytic; D000951:Antigens, Neoplasm; D015260:Neprilysin; D013755:Tetradecanoylphorbol Acetate