107 Background: Perioperative chemotherapy has demonstrated better OS and DFS than surgery alone in resectable stomach or EGJ adenocarcinoma. Trastuzumab has improved OS when added to chemotherapy in pts with HER-2 + metastatic gastric cancer and is interesting to explore its role in the perioperative setting. Methods: A Spanish, multicenter, open-label phase II study evaluated the efficacy and toxicity profile of perioperative XELOX-T (Capecitabine 1000 mg/m2/12h po days 1-14, oxaliplatin 130 mg/m2 day 1, trastuzumab 8 mg/kgà6 mg/kg day 1, q3w ; 3 preoperative cycles and 3 postsurgery cycles followed by 12 cycles of trastuzumab monotherapy) in patients with T1-2N+M0 or T3-4NxM0 resectable stomach or EGJ adenocarcinoma, HER-2+ ( IHQ3+ or IHQ2+/FISH+). The primary endpoint was 18 months DFS, secondary endpoint included pCR, R0 resection rate, ORR, toxicity of preoperative treatment (NCI CTC v3.0 criteria) and biomarker analysis. Results: From June 2010 to March 2012, 36 pts were included: median age 65 (39-85); ECOG 0/1/2: 16/19/1 pts; localization: stomach 21 pts, EGJ 15 pts; histologic type: intestinal: 23 pts, diffuse: 4 pts, mixed: 1pt, not specified 8 pts; TNM: T 4: 7 pts; N+: 31 pts. Preoperative XELOX-T: Response: PR: 14 pts (39%), SD: 18 pts, PD: 0 pts, NE: 4 pts. Surgery was performed in 31 pts: R0: 28 pts (78%, 95% CI: 61-90%), R1: 1 pt, R2: 2 pts (1 had peritoneal carcinomatosis); pCR was observed in 3 pts (8.3 %; 95% CI: 2-22%). Two pts died due to surgical complications. After R0/R1 resection, postoperative XELOX-T was administered to 24 patients, 22 of whom underwent T monotherapy. G3-4 toxicity (>5% of pts): diarrhea 33%, nauseas and vomiting 8% and pneumonia, anemia, neutropenia, anorexia, asthenia and pleural effusion with pneumothorax: 5.5%. With a median follow up of 24.1 months, 18m DFS is 71% (95% CI: 53-83%), 24 m DFS is 60% and median DFS and OS has not been reached. Conclusions: These data suggest that perioperative XELOX+T in HER-2 positive resectable stomach or esophagogastric junction adenocarcinoma is feasible and has promising activity. Clinical trial information: NCT01130337.