AB31. Feasibility and efficacy of preoperative chemoradiotherapy in patients with locally advanced gastric cancer

Objective: Investigate the feasibility and efficacy of neoadjuvant chemoradiotherapy for locally advanced gastric cancer.

Methods: Intensity-modulated radiotherapy (IMRT), with 50/45 Gy in 25 fractions. The concurrent chemotherapy regimens included oral TS-1 plus oxaliplatin 40 mg/m² intravenously weekly (10 patients) or TS-1 alone (120 mg/day, 25 patients). Surgical resection was performed within 6-8 weeks after the last day of radiotherapy.

Results: No grade 4 toxicity recorded. The incidence of grade 3 toxicity is 11.4%: thrombocytopenia (5.7%), neutropenia (2.9%) and radiation esophagitis (2.9%). Pathological complete response 8.6% (3/35). Surgery-related complications consisted of anastomotic leakage in 2 patients (7.1%), infection in 3 (10.7%) and hemorrhage in 2 (7.1%). No postoperative mortality was recorded. The 1- and 2-year overall survival (OS) rates were 88.3% and 59.6% respectively.

Conclusions: In this study, neoadjuvant chemoradiotherapy showed an acceptable toxicity and promising efficacy in patients with locally advanced gastric cancer.