 The presence of TEL/AML1 fusion gene in childhood acute lymphoblastic leukaemia (ALL) defines a subgroup of patients with better than average outcome.     ///    "Moreover, we demonstrate different patterns of bone marrow clean-up in TEL/AML1-positive patients.. "    ///    TEL/AML1 positivity in childhood ALL: average or better prognosis? Czech Paediatric Haematology Working Group..     ///    Interim analysis of the minimal residual disease (MRD) detection shows heterogeneity within the group of newly diagnosed TEL/AML1-positive leukaemias--10 out of 24 patients tested at the end of induction therapy had detectable levels of MRD.     ///    "From March 1995 to June 1998, 41 out of 190 (21.6%) newly diagnosed children with ALL were TEL/AML1-positive. "    ///    "In conclusion, we corroborate low frequency of TEL/AML1 positivity among relapsed patients with ALL among Czech children who are treated by the BFM protocols. "    ///    There is a statistically significant difference between the incidence of TEL/AML1 fusion at diagnosis and at relapse within our group (P = 0.035). 