Gastric carcinoma

摘要: Gastric cancer was the second commonest cancer in the world in 1990, with an estimated 800,000 new cases and 650,000 deaths per year; 60% of them occurred in developing countries {1469}. The areas with the highest incidence rates (> 40/100,000 in males) are in Eastern Asia, the Andean regions of South America and Eastern Europe. Low rates (< 15/100,000) are found in North America, Northern Europe, and most countries in Africa and in SoutheasternAsia {1471}. There is about a 20-fold difference in the incidence rates when comparing the rates in Japan with those of some white populations from the US and those of some African countries. A predominance of the intestinal type of adenocarcinoma occurs in high-risk areas, while the diffuse type is relatively more common in low-risk areas {1296}.