1 Surgery Department, University Hospital 12 de Octubre, Madrid, Spain.
2 Digestive Cancer Research Group, 12 de Octubre Research Institute, Madrid, Spain.
3 Molecular Biology Laboratory, University Hospital 12 de Octubre, Madrid, Spain.
4 Molecular Medicine Unit, Biomedical Research Institute of Salamanca (IBSAL), Institute of Molecular and Cellular Biology of Cancer (IBMCC), University of Salamanca-USAL-CSIC, Salamanca, Spain.
5 Pathology Department, University Hospital 12 de Octubre, Madrid, Spain.
6 Familial Cancer Clinical Unit, Spanish National Cancer Centre (CNIO), Madrid, Spain.
7 Center for Biomedical Network Research on Rare Diseases (CIBERER), Institute of Health Carlos III, Madrid, Spain.