 The recently recognized translocation t(12;21)(p13;q22), which results in the ETV6-AML1 fusion product, is the most common genetic rearrangement found in childhood pre-B acute lymphoblastic leukaemia (ALL).     ///    Reverse transcription polymerase chain reaction for the ETV6-AML1 fusion transcript was positive in 14 patients.     ///    "In the case of ETV6-AML1 pre-B ALL, this characteristic immunophenotype may have implications for the immunogenicity of the leukaemic cells.. "    ///    ETV6 (TEL)-AML1 pre-B acute lymphoblastic leukaemia cells are associated with a distinct antigen-presenting phenotype..     ///    "Using flow cytometry, we investigated whether the unique ETV6-AML1 phenotype extended to molecules associated with antigen presentation by analysing 50 diagnostic bone marrow samples from paediatric pre-B ALL patients. "