Gastrointestinal Unit;
Service of Medical Oncology;
Portuguese Oncology Institute;
4200-072 Porto;
Portugal;
Gastrointestinal Unit;
Experimental Pathology and Therapeutics Group;
Research Center-Portuguese Oncology Institute;
4200-072 Porto;
Portugal;
Department of Pharmacology and Therapeutics;
Faculty of Medicine;
University of Porto;
4200-319 Porto;
Portugal;
Institute of Cellular and Molecular Biology;
4150-180 Porto;
Portugal;
Gastrointestinal Unit;
Section of Surgical Oncology;
Portuguese Oncology Institute;
4200-072 Porto;
Portugal;
Department of Medicine;
Faculty of Medicine;
University of Porto;
4200-319 Porto;
Portugal;
Gastric; cancer; Human; epidermal; growth; factor; receptor; 2; Biomarkers; Target; therapies; Trastuzumab; Lapatinib; Pertuzumab; Trastuzumab-DM1; Afatinib;