title: Body mass index and risk of gastric cancer: a meta-analysis of a population with more than ten million from 24 prospective studies.
abstract: BACKGROUND
  To provide a quantitative assessment of the association between body mass index (BMI) and the risk of gastric cancer, we summarized the evidence from prospective studies.
  
  
  METHODS
  Eligible studies published up to November 30, 2012, were retrieved via computer searches of MEDLINE and EMBASE as well as manual review of references. Summary relative risks (SRR) with their corresponding 95% confidence intervals (CI) were calculated using a random-effects model.
  
  
  RESULTS
  A total of 24 prospective studies of BMI and gastric cancer risk with 41,791 cases were included in our analysis. Overall, both overweight (BMI, 25-30 kg/m(2)) and obesity (BMI, ≥30 kg/m(2)) were not associated with risk of total gastric cancer (overweight: SRR, 1.01; 95% CI, 0.96-1.07; obesity: SRR, 1.06; 95% CI, 0.99-1.12). Furthermore, we found increased BMI was positively associated with the risk of gastric cardia cancer (GCC; SRR = 1.21 for overweight and 1.82 for obesity), but not with gastric non-cardia cancer (GNCC; SRR = 0.93 for overweight and SRR = 1.00 for obesity). Similar results were observed in a linear dose-response analysis.
  
  
  CONCLUSIONS
  On the basis of meta-analysis of prospective studies, we find high BMI is positively associated with the risk of GCCs but not with GNCCs.
  
  
  CONCLUSIONS
  (i) On the basis of more definite and quantitative evidence than previously available, we found that increasing BMI was not a clear risk factor for total gastric cancer. (ii) Increased BMI was positively associated with risk of GCC but not with GNCCs.
authors.affiliation: Department of Interventional Radiology, Zhongshan Hospital, Fudan University, Shanghai, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Chen
authors.forename: Lingxiao
authors.initials: L
authors.lastname: Liu
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Wang
authors.forename: Jianhua
authors.initials: J
authors.lastname: Wang
authors.forename: Zhiping
authors.initials: Z
authors.lastname: Yan
authors.forename: Jieming
authors.initials: J
authors.lastname: Cheng
authors.forename: Gaoquan
authors.initials: G
authors.lastname: Gong
authors.forename: Guoping
authors.initials: G
authors.lastname: Li
mesh_terms: D015992:Body Mass Index; D005260:Female; D006801:Humans; D008297:Male; D009765:Obesity / Q000150:complications / Q000453:epidemiology; D011446:Prospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D013274:Stomach Neoplasms / Q000453:epidemiology* / Q000209:etiology