1. Center of Experimental Oncology, Gastrointestinal and Neuroendrocrine Tumors Research Group, Research Institute Hospital 12 de Octubre (imas12) , 28041 Madrid , Spain
2. Oncology Department, Hospital Universitario 12 de Octubre , 28041 Madrid , Spain
3. National Center for Drug Research and Evaluation, National Institute of Health (ISS) , 00161 Rome , Italy
4. Spanish National Cancer Research Center (CNIO) , 28029 Madrid , Spain
5. Department of Chemistry and Biochemistry, Facultad de Farmacia, Centre for Metabolomics and Bioanalysis (CEMBIO), Universidad San Pablo-CEU, CEU Universities , Urbanización Montepríncipe, Boadilla del Monte , 28925 Madrid, Spain
6. Vall Hebron University Hospital and Vall Hebron Institute of Oncology (VHIO) , 08035 Barcelona , Spain
7. Medical Oncology Department, Hospital Virgen del Rocío, Instituto de Biomedicina de Sevilla (IBIS) , 41013 Seville , Spain
8. Medical Oncology Department, Hospital Universitario Central de Asturias, ISPA , 33011 Oviedo , Spain
9. Medical Oncology, Hospital Universitario Ramón y Cajal , 28034 Madrid , Spain
10. Institut Català d'Oncologia (ICO)-Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), 08908 L'Hospitalet del Llobregat , Barcelona , Spain
11. Department of Medical Oncology, Hospital Universitario La Paz, CIBERONC CB16/12/00398 , 28046 Madrid , Spain
12. Sarcomas and Rare Tumours Unit, Istituto Nazionale Tumori, IRCCS Fondazione G. Pascale , 80131 Naples , Italy
13. Department of Medical Oncology, Biodonostia Health Research Institute, Donostia University Hospital, University of the Basque Country (UPV/EHU) , 20014 San Sebastián , Spain
14. Division of Gastrointestinal Medical Oncology and Neuroendocrine Tumors, IEO, European Institute of Oncology, IRCCS , 20141 Milan , Italy
15. Medicine Department, Complutense University of Madrid (UCM) , 28040 Madrid , Spain
16. Genetics, Physiology and Microbiology Department, Complutense University of Madrid (UCM) , 28040 Madrid , Spain