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Background The association between compliance to an enhanced recovery protocol (ERAS) and outcome after surgery for gastric cancer has been poorly investigated, particularly in Western patients. The aim of the study was to evaluate whether the rate of adherence to the ERAS program was correlated with outcome and time of discharge. Methods A prospective, observational, multicenter study was designed to be performed at Italian referral centers for gastric surgery. The protocol was discussed and approved by the Italian Research Group on Gastric Cancer. Twentythree ERAS domains were applied. A multivariate logistic regression was used to assess the association between ERAS compliance and overall and major complication rates. The Poisson regression model (measured as mean ratios) was used to assess the association of ERAS compliance rate and length of stay (LOS). Results Eight centers participated and 290 subjects with a median age of 73 years were enrolled. The overall rates of adherence to pre-, intra-, and postoperative ERAS items were 69.8%, 60.3%, and 82.5%, respectively. At the multivariate model, there was an association between overall rate of morbidity and an overall ERAS compliance rate greater than 70% (OR 0.413; 95% CI 0.235-0.7240; P 0.002). A similar association was found for major complications (OR 0.328; 95% CI 0.151-0.709; P 0.005). The Poisson regression showed that in patients with ERAS compliance rate [70%, LOS was reduced of approximately 20% (mean ratio 0.812; 95% CI 0.694-0.950; P 0.009). Conclusions These results suggest a moderate compliance to an ERAS program and a significant association between adherence and outcomes.Luca Gianotti and Uberto Fumagalli Romario have equally contributed to first authorship.

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This study suggests that patients treated with the present protocol achieve good survival and high pCR rate. Further research is necessary to evaluate whether surgery on demand is feasible in selected patients, such as pCR patients with adenocarcinoma.