145P A nomogram for predicting the benefit of adjuvant chemotherapy after resection in patients with Borrmann type IV gastric cancer

Abstract

This study sought to explore prognostic factors for patients with Borrmann type IV gastric cancer and to establish a predictive model for survival benefit of postoperative adjuvant chemotherapy in such patients. This study reviewed the clinical data of patients who underwent curative surgery at Fujian Medical University Union Hospital from 2006 to 2014 for Borrmann type IV gastric cancer using a prospective database. Cox regression analyses were performed to identify prognostic factors that formed the basis for a nomogram and risk groups. Establishment of risk groups to identify patients with Borrmann type IV gastric cancer who would benefit from adjuvant chemotherapy. 265 patients who underwent R0 resection were included in this study.Multivariate analysis showed that BMI, tumour differentiation, pT stage, pN stage, and ASA score were independent prognostic factors. Patients in the ACT-group had longer OS than patients in the SA-group, although the p-value for this difference was marginally above the threshold for statistical significance (23.8% vs. 10.9%, p=0.057). Stratified analysis showed that there was no significant difference in OS between the ACT-group and the SA-group for each AJCC stage (stage II: 40.6% vs. 29.8%, p=0.44; stage III: 21.4% vs. 9.7%, p=0.056).A nomogram was established based on these independent risk factors, and nomogram scores were used to divide all patients into a high-risk group (score>16), an intermediate-risk group (8<score≤16) and a low-risk group (score≤8).Further stratified analysis based on AJCC stage showed that the 3-year survival rate was higher in the adjuvant chemotherapy group than in the surgery alone group for low- and intermediate-risk patients in each AJCC stage, while high-risk patients in stage III did not significantly differ. The nomogram that we established may effectively be used to identify patients with Borrmann type IV gastric cancer who would benefit from postoperative adjuvant chemotherapy. Postoperative adjuvant chemotherapy can improve survival in low- and intermediate-risk patients.