1. From the Instituto Universitario Fernández-Vega, University of Oviedo, Oviedo, Spain
2. Instituto de Investigación Sanitaria del Principado de Asturias, Oviedo, Spain
3. Department of Functional Biology, University of Oviedo, Oviedo, Spain
4. Department of Medical Oncology, Hospital Universitario Central de Asturias, Oviedo, Spain
5. Department of Biochemistry and Molecular Biology, University of Oviedo, Oviedo, Spain
6. Instituto Universitario de Oncología del Principado de Asturias, University of Oviedo, Oviedo, Spain
7. Department of Surgery and Medical-surgical Specialties, University of Oviedo, Oviedo, Spain
8. Department of Pathology, Hospital Universitario Central de Asturias, Oviedo, Spain