POSITIVE ASSOCIATION BETWEEN DIETARY-FAT INTAKE AND RISK OF GASTRIC STUMP CARCINOMA IN RATS

Effect of high- and low-fat diets on gastric stump carcinogenesis was experimentally investigated, A total of 130 Wistar male rats weighing 250-300 g received either sham operation or Billroth II partial gastre ctomy, the resection of the distal two-thirds glandular stomach and re construction of gastro-jejunostomy. After surgery, each group of rats was switched from a standard diet (CRF-1) to a special diet containing either 15% soybean oil (high-fat) or 0.5% soybean (low-fat), fed ad l ibitum and tap water, and were killed 50 weeks after surgery, Gastric tumours were observed only in the animals that underwent gastrectomy, while no tumours were detected in the animals following the sham opera tion. Tumours located invariably at the gastrojejunostoma, were carcin omas or adenomas in histology, Carcinomas developed in 12 of 29 gastre ctomy animals (41%) fed the high-fat diet and 4 of 27 gastrectomy anim als (15%) fed the low-fat diet, The difference was significant (P < 0. 05), The incidence of adenoma was also significantly higher in the gas trectomy animals fed the high-fat diet (38%) than that in those fed th e low-fat diet (15%) (P < 0.05), A daily faecal output of bile acids w as significantly greater in the gastrectomy animals fed the high-fat d iet (19.0 +/- 16.4 mu mol/day) than that in those fed the low-fat diet (11.2 +/- 6.2 mu mol/day; P < 0.05). This study suggests that increas ed fat intake is associated with a high risk of gastric stump carcinom a.