Minimal residual disease with TEL-AML1 fusion transcript in childhood acute lymphoblastic leukaemia with t(12;21)..     ///    We analysed the TEL-AML1 transcript using reverse transcription-polymerase chain reaction (RT-PCR) in order to detect minimal residual disease (MRD) in seven children with t(12;21)-associated B-lineage ALL.     ///    "Leukaemic cells with the TEL-AML1 transcript appear to be very sensitive to chemotherapy, and may be eradicated in most patients if adequate chemotherapy is given. "