The TEL-AML1 fusion transcript, which is associated with t(12;21) (p13;q22), is found in 25% of childhood B-cell precursor ALL, and represents an interesting alternative target.     ///    We compared two methods for quantitating TEL-AML1 fusion transcripts: competitive PCR and real-time PCR.     ///    "When comparison was possible, results obtained using TEL-AML1 quantification were in accordance with those obtained using T-cell receptor rearrangements analysis.. "    ///    "The constancy of TEL-AML1 expression was evaluated by measuring TEL-AML1 transcripts at different steps of the cell cycle, and in 21 cases of ALL at diagnosis. "    ///    "Giving highly correlated results, both techniques can be conveniently used for TEL-AML1 transcript quantification. "    ///    Quantification of TEL-AML1 transcript for minimal residual disease assessment in childhood acute lymphoblastic leukaemia..     ///    No major variation in TEL-AML1 expression was observed during the cell cycle or in 20/21 of the ALL patients. 