Impact of maintenance therapy with fluoropyrimidines in advanced esophageal-gastric adenocarcinoma: a retrospective study in Mexican population - Dip Borunda, Abdel Karim; Pimentel Rentería, Alberto; Medrano Guzmán, Rafael; Enríquez Román, Lizbeth; Martin Aguilar, Ana Elena; Grajales Álvarez, Rocío; Cervantes Diaz, María Teresa De Jesús (Journal of Gastrointestinal Oncology, 2025)