Review Role of Her-2 in Gastrointestinal Tumours beyond Gastric Cancer: A Tool for Precision Medicine Csongor G. Lengyel 1, Baker Habeeb 2 , Shah Z. Khan 3 , Khalid El Bairi 4 , Sara C. Altuna 5, Sadaqat Hussain 6, Syed Ayub Mazher 7, Dario Trapani 8 and Angelica Petrillo 9,10,* 1 Head and Neck Surgery, National Institute of Oncology, 1122 Budapest, Hungary;
[email protected] 2 Medical Oncology Department, Shaqlawa Teaching Hospital, Erbil 44001, Iraq;
[email protected] 3 Department of Clinical Oncology, BINOR Cancer Hospital, Bannu 28100, Pakistan;
[email protected] 4 Cancer Biomarkers Working Group, Oujda 60000, Morocco;
[email protected] 5 Oncomédica C.A., Caracas 1060, Venezuela;
[email protected] 6 Northwest Cancer Center, Western Health and Social Care Trust, Altnagelvin Hospital, Londonderry BT47 6SB, UK;
[email protected] 7 UT Southwestern Clements University Hospital, Dallas, TX 75390, USA;
[email protected] 8 European Institute of Oncology, IRCCS, 20141 Milan, Italy;
[email protected] 9 Medical Oncology Unit, Ospedale del Mare, 80147 Naples, Italy 10 Division of Medical Oncology, Department of Precision Medicine, School of Medicine, University of Study of Campania “L.Vanvitelli”, 81100 Caserta, Italy * Correspondence:
[email protected] Abstract: Gastrointestinal (GI) tumors account for a quarter of all the cancer burden and a third of the global cancer-related mortality. Among them, some cancers retain a dismal prognosis; therefore, newer and innovative therapies are urgently needed in priority disease areas of high-unmet medical need. In this context, HER2 could be a relevant prognostic and predictive biomarker acting as a target for specific drugs.