Contributions to the study of gastric carcinogenesis.

Investigations were carried out on duodeno- and jejunogastric reflux, gastric juice acidity, microbial population and the concentration of nitrites in 199 subjects. In gastric cancer patients or those with gastric ulcer, chronic atrophic gastritis, stomach resection or more seldom with removal of the gallbladder, a significant increase over normal values of the pH, duodenogastric reflux, microbial flora contamination (especially intestinal) and nitrite concentration was found. In smokers the salivary nitrite concentration was greater than in non-smokers and in direct relationship to gastric concentrations. The parallelism of these alterations suggests a causative relation between them and their presence in diseases or conditions of notorious increased incidence in gastric cancer highlights the direction to be followed in the primary prophylaxis of this disease.