J L Lopez Guerra1, E Rivin2, F Guedea3, M J Ortiz1. 1. Virgen del Rocío University Hospital, Department of Radiation Oncology, Seville, Spain. 2. Department of Radiation Oncology, Institut de cancérologie Gustave Roussy, Villejuif, Paris, France. 3. Department of Radiation Oncology, Institut Català d'Oncologia, L'Hospitalet de Llobregat, Barcelona, Spain.