(21-01-06) Body size and composition and the risk of gastric and oesophageal adenocarcinoma.
Macinnis RJ, English DR, Hopper JL, Giles GG.
Cancer Epidemiology Centre, The Cancer Council Victoria, Melbourne, Victoria, Australia.
Although evidence has been mounting that obesity may be related to the increased incidence of oesophageal and gastric cardia malignancies, these reports (mainly case-control studies) have relied on imperfect measures of obesity such as body mass index (BMI), and generally have not clearly distinguished between anatomical subsites within the oesophagus and stomach. In a prospective study of people aged 27-75 years, we directly measured fat mass and fat-free mass (using bioelectrical impedance analysis), height, weight and waist and hip circumferences. Among 41,295 people followed on average for 11.3 years, 30 cases with cancers in the gastric cardia or lower third of the oesophagus and 68 cases with noncardia gastric adenocarcinomas were ascertained via the population cancer registry. The risk of adenocarcinoma of the lower oesophagus and gastric cardia was positively associated with BMI with a hazards ratio (HR) and (95% confidence interval) for people with BMI >/= 30 kg/m(2) compared with those <25 kg/m(2), of 3.7 (1.1-12.4), an HR per 10 cm increase in waist circumference of 1.46 (1.05-2.04), and a HR per 10 kg increase on fat-free mass of 2.06 (1.15-3.69). Noncardia gastric adenocarcinoma showed little relationship with body size. We observed an increased risk of adenocarcinoma of the lower oesophagus and gastric cardia associated with increased BMI, central adiposity and the nonfat component of weight, but found no association with noncardia gastric adenocarcinoma. An increasing prevalence of obesity may be associated with the increasing incidence of gastro-oesophageal cancer observed in many populations. (c) 2005 Wiley-Liss, Inc.
PMID: 16353151 [PubMed - as supplied by publisher]
Int J Cancer. 2005 Dec 13; [Epub ahead of print]
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