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ZHANG, S. S; YANG, H; HU, R. G; WEN, J; HU, Y; FU, J. H; LUO, K. J; HUANG, Q. Y; CHEN, J. Y; YANG, F; CAI, X. L; XIE, X; LIU, Q. W; BELLA, A. E
British journal of cancer, 11/2013, Volume: 109, Issue: 11Journal Article
Body mass index (BMI) has been associated with the risk of oesophageal cancer. But the influence of BMI on postoperative complication and prognosis has always been controversial. In total, 2031 consecutive patients who underwent oesophagectomy between 1998 and 2008 were classified according to Asian-specific BMI (kg m(-2)) cutoff values. The impact of BMI on overall survival (OS) was estimated using the Kaplan-Meier method and Cox proportional hazard models. We performed a meta-analysis to examine the association of BMI with OS and postoperative complication. Patients with higher BMI had more postoperative complication (P=0.002), such as anastomotic leakage (P=0.016) and cardiovascular diseases (P<0.001), but less incidence of chylous leakage (P=0.010). Logistic regression analysis showed that BMI (P=0.005) was a confounding factor associated with postoperative complication. Multivariate analysis showed that overweight and obese patients had a more favourable survival than normal weight patients (HR (hazard ratio) = 0.80, 95% CI (confidence interval): 0.70-0.92, P=0.001). Subgroup analysis showed that the association with higher BMI and increased OS was observed in patients with oesophageal squamous cell carcinoma (ESCC) (P<0.001), oesophageal adenocarcinoma (EA) (P=0.034), never-smoking (P=0.035), ever-smoking (P=0.035), never alcohol consumption (P=0.005), weight loss (P=0.003) and advanced pathological stage (P<0.001). The meta-analysis further corroborated that higher BMI was associated with increased complication of anastomotic leakage (RR (risk ratio)=1.04, 95% CI: 1.02-1.06, P=0.001), wound infection (RR=1.03, 95% CI: 1.00-1.05, P=0.031) and cardiovascular diseases (RR=1.02, 95% CI: 1.00-1.05, P=0.039), but decreased incidence of chylous leakage (RR=0.98, 95% CI: 0.96-0.99, P<0.001). In addition, high BMI could significantly improved OS (HR=0.78, 95% CI: 0.71-0.85, P<0.001). Preoperative BMI was an independent prognostic factor for survival, and strongly associated with postoperative complications in oesophageal cancer.
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