Gastric and colorectal cancer in the tropical part of Africa (a review).

Until recently the practitioners in Africa, and also those in the temperate climates, had to rely on literature written in an environment that is very different from the tropical circumstances. In the rapidly changing world the physician must be well-informed about the differences which exist between the medical practice of the tropical and of the temperate climates. In this article the characteristics of gastric and colorectal cancer in the tropical (sub-Saharan) part of Africa are briefly reviewed.