Fig. 1: Cohort overview.

Cap capecitabine, FISH fluorescent in situ hybridization, GEA gastroesophageal adenocarcinoma, HER2 human epidermal growth factor receptor 2, IHC immunohistochemistry, QW every week, Q2W every 2 weeks, Q3W every 3 weeks, Pac paclitaxel, PD progressive disease. aHER2-positive defined as IHC 3+ or IHC 2+/FISH+. bResponse evaluable analysis set.