GC: gastric cancer; GEJC: gastroesophageal junction cancer; HER1: epidermal growth factor receptor type one; HER2: epidermal growth factor receptor type two; mFOLFOX6: modified folinic acid plus 5-fluorouracil plus oxaliplatin; NCT: national clinical trial; Ref: reference. Here, EGFR is linked to gastric cancer.