The frequency of patients with TEL/AML1 gene fusion was 19% (11 out of 58 cases).     ///    Prevalence of TEL/AML1 fusion gene in Brazilian pediatric patients with acute lymphoblastic leukemia..     ///    "The mean age of the patients with TEL/AML1 fusion was 4.8 years and the mean amount of peripheral leukocytes was 44,270 x 10(6)/L. "    ///    The prevalence of TEL/AML1 fusion in Brazilian children in our study is similar to that found in other populations..     ///    "Deletion of the wild-type TEL allele was observed in 27.3% of TEL/AML1 fusion-positive cases, but it was also identified in 4.2% of the negative cases. "