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Summary. The aim of this retrospective single institution study was to investigate the long-term outcome of sequential chemotherapy (CHT) and radiotherapy (RT) in patients ≥ 70 years old, considering the International Prognostic Index (IPI) for high-grade non-Hodgkin's lymphoma (NHL) and comorbidity. The study involved 106 patients aged 70 years and above, treated between 1986 and 1998, for diffuse large B-cell NHL (DLBCL); 57% had localized disease (stage I or II) and 43% had advanced disease (stage III or IV). All patients received four to six cycles of CHOP (cyclophosphamide, hydroxy-daunorubicin, oncovin, prednisone) CHT at 14–21 d intervals, followed in 69 cases by extended-field or involved-field RT. Complete response rate was 65%; overall survival probability at 5 years was 41% in all stages. Five-year survival was 62% in patients with localized and 12% in advanced disease. There were 3% treatment-related deaths. The 5-year survival rate was 70% in patients with IPI low risk, 46% with low-intermediate risk, 28% with high-intermediate risk and 0% with high risk. Patients with cardiac problems and advanced disease were more susceptible to treatment-related toxicity. Patients with hypertension showed a high rate of vinca alkaloid-associated polyneuropathy. Most patients with localized DLBCL achieved long-term remission after CHT and RT regimens despite advanced age and frequent comorbidities. Advanced disease increased the risk for treatment-related complications and efficacy of treatment seemed limited. [ABSTRACT FROM AUTHOR]