External validity of clinical trials with diverse trastuzumab-based chemotherapy regimens in advanced gastroesophageal adenocarcinoma: data from the AGAMENON-SEOM registry oleh Paula Jimenez-Fonseca, Alberto Carmona-Bayonas, Alba Martinez-Torron, Maria Alsina, Ana Custodio, Olbia Serra, Diego Cacho Lavin, María Luisa Limón, Tamara Sauri, Flora López, Laura Visa, Mónica Granja, Nieves Martínez Lago, Virginia Arrazubi, Rosario Vidal Tocino, Raquel Hernandez, Gema Aguado, Juana María Cano, Alfonso Martín Carnicero, Monserrat Mangas, Paola Pimentel, Ana Fernández Montes, Ismael Macias Declara, Federico Longo, Avinash Ramchandani, Marta Martín Richard, Alicia Hurtado, Aitor Azkarate, Carolina Hernández Pérez, Raquel Serrano, Javier Gallego