Impact of hospital volume on long-term survival after resection for oesophageal cancer: A population-based study in Taiwan

Abstract

OBJECTIVES: Previous studies have shown that patients who undergo oesophageal cancer surgery in high-volume hospitals have lower postoperative mortality rates. However, the impact of hospital volume on long-term survival is controversial. METHODS: We identified 2151 patients who were diagnosed with oesophageal cancer between 2008 and 2011 from a national population- based cancer registry in Taiwan. High-volume hospitals were defined as those performing more than 86 oesophagectomies during that period (22 cases/year). Patients were stratified by whether they received preoperative chemoradiation. Cox regression analyses were used to determine the survival impact of hospital volume. RESULTS: The 3-year overall survival rates after oesophagectomies were 44.9% in high-volume hospitals, compared with 40.2% in lowvolume hospitals (P = 0.002). For patients who received preoperative chemoradiation (n = 850), the 1- and 3-year overall survival rates were 74.7 and 36.8%, respectively, in high-volume hospitals, compared with 73.5 and 42.6%, respectively, in low-volume hospitals (P = 0.333). For patients who did not receive preoperative chemoradiation (n = 1301), the 1- and 3-year overall survival rates were 78.1 and 50.0%, respectively, in high-volume hospitals, compared with 67.9 and 38.8%, respectively, in low-volume hospitals (P < 0.001). Multivariate analysis showed that hospital volume, resection margin, cT, pT and pN stages are significant independent prognostic factors. CONCLUSIONS: Overall survival rate of patients who undergo oesophagectomies without preoperative chemoradiation at high-volume hospitals is significantly higher than at low-volume hospitals. However, there was no significant correlation between hospital volume and long-term outcome in patients who received preoperative chemoradiation.