Gastric Cancer Risk Factors and Screening Guidelines

Introduction to Risk Factors

The American Gastroenterological Association recommends considering blood type alongside other established risk factors when assessing gastric cancer risk, as blood type A is associated with an approximately 20% increased risk of gastric cancer compared to other blood types 1, 2

Geographic origin, such as first-generation immigrants from high-incidence regions, is a significant risk factor for gastric cancer, according to the American Gastroenterological Association 1, 3
Family history, with a first-degree relative having gastric cancer, increases the risk 2-3 fold, and when combined with blood type A, yields an OR of 2.61 for dysplasia 3
Age, with peak incidence in the seventh decade, is a risk factor for gastric cancer 3
Male gender is associated with approximately a 2-fold increased risk of gastric cancer 3
Tobacco exposure is a significant risk factor for gastric cancer, as stated by the American Gastroenterological Association 1, 3
Persistent poverty is linked to 43% higher mortality rates from gastric cancer 3
Hereditary cancer syndromes, such as Lynch syndrome and familial adenomatous polyposis, increase the risk of gastric cancer, according to the American Medical Association 1, 4

The American Gastroenterological Association suggests that blood type A should lower the threshold for gastric cancer screening when combined with other risk factors, such as first-degree relative with gastric cancer or cagA-positive H. pylori infection 1, 5
Immigration from high-incidence regions, especially for first-generation immigrants, is a factor to consider for screening, as recommended by the American Gastroenterological Association 1, 3
The presence of multiple modifiable risk factors, including smoking, high salt diet, and persistent poverty, should be considered for screening, according to the American Gastroenterological Association 1, 3