title: Ph1 positive blast crisis of chronic myeloid leukaemia exhibiting features characteristic of early T blasts.
abstract: Leukaemic cells from a patient in the blast crisis of chronic myeloid leukaemia were subjected to a surface marker analysis using a panel of monoclonal antibodies recognizing differentiation antigens of myeloid (MY7, MY906, VIM D5, M phi P9), erythroid (VIE G4), megakaryocyte (AN51), T-lymphoid (WT1, 10.2, OKT3, OKT4, OKT6, OKT8, OKT11A) and B-lymphoid cells (B1, B2, Y29/55), common ALL-antigen (VILA1), non-lineage-restricted antigens (OKT9, OKT10), monomorphic HLA-DR determinants (7.2) as well as TdT. When the patient entered his first blast crisis, his blasts expressed a phenotype corresponding to an immature myeloid cell (7.2+, MY7+, My906+, VIM D5-). Ph1-chromosome-positive blasts from this patient's first relapse had completely changed their surface marker characteristics: they had become TdT-positive and exhibited surface features characteristic of early T blasts (WT1+, 10.2+, OKT9+, OKT10+, 7.2-, OKT6-). Together, these features provide evidence that myeloid cells may share a common precursor with T cells.
mesh_terms: D000328:Adult; D000911:Antibodies, Monoclonal; D002904:Chromosomes, Human, 21-22 and Y; D006801:Humans; D007951:Leukemia, Myeloid / Q000235:genetics / Q000276:immunology / Q000473:pathology*; D008297:Male; D013601:T-Lymphocytes / Q000276:immunology / Q000473:pathology*
chemical_list: D000911:Antibodies, Monoclonal