The results of combined treatment were analysed retrospectively in 85 children with nonlymphoblastic non-Hodgkin's lymphomas (NHL) of I-II-III stages (Ann Arbor). The importance of involved-field radiation therapy (IFRT) combined with ACOP, MEV, COP chemotherapy was assessed. All patients experienced high grade nonlymphoblastic subtypes of NHL as follows: follicular center cells, undifferentiated, immunoblastic (Lukes-Collins classification). Adjuvant IFRT resulted in significantly increased rate of 5-year overall and disease-free survival and diminished relapse frequency.