• Propósito: analizar los resultados del tratamiento radioterápico sin quimioterapia tras cirugía radical en cáncer rectal. • Results: With a median follow-up of 76.64 months, the actuarial cancer-specific and diseasefree survival rates were 60.5 % and 58.1 %, respectively. Local control at 5 years was 66.6 %, and distant control 80.1 %. Acute toxicity incidence was 73.7 %. No grade 3-4 toxicity was produced, and it was not necessary to interrupt radiation therapy or hospitalization because of toxicity. Late grade 3 toxicity appeared in 5.3 % of the patients. • Conclusions: Patients with B2-C stage rectal cancer in which chemotherapy is not possible, can receive postoperative radiotherapy alone considering its low toxicity and good results.