Age-related differences in the distribution, biology and treatment response of non-Hodgkin's lymphoma (NHL) in adolescents remain to be elucidated. The current analyses present clinical parameters and outcomes of adolescents treated in pediatric NHL-BFM trials. Patients were stratified by histological subtype: lymphoblastic lymphoma (LBL); mature B-NHL, including Burkitt's lymphoma/ leukemia (BL/B-AL), diffuse B-cell lymphoma (DLBCL-CB) and mediastinal B-cell lymphoma (PMLBL); and anaplastic large cell lymphoma (ALCL). Between October 1986 and December 2007, 2915 patients were registered, including 378 (13%) adolescents (15-18 years) with BL/B-AL (n ¼ 101), ALCL (n ¼ 74), DLBCL-CB (n ¼ 55), T-LBL (n ¼ 45), PMLBL (n ¼ 24), pB-LBL (n ¼ 13) and rare or not-specified NHL subtypes (n ¼ 66). The 5-year eventfree survival (EFS) was 79 ± 2% for adolescents compared with 85 ± 1% for patients aged o15 years (P ¼ 0.014). EFS was 83 ± 7% for adolescents with T-LBL, 82 ± 4% with BL/B-AL, 85 ± 5% with DLBCL-CB, 57 ± 10% with PMLBL and 70 ± 6% with ALCL. According to sex, the 5-year EFS in females versus males, respectively, was 70±5 versus 83±2% overall (P ¼ 0.004), 57±17 versus 92±6% (P ¼ 0.0036) for T-LBL patients and 71±9 versus 97 ± 3% (P ¼ 0.0067) for DLBCL-CB patients. Adolescents with NHL treated according to pediatric NHL-BFM protocols had an EFS of 79 ± 2%, which is marginally inferior to that of children. In adolescents with T-LBL and DLBCL-CB, female sex was associated with a worse prognosis.