Geographical distribution of lung and stomach cancers in South Africa, 1968-1972.

The geographical distribution of lung and stomach cancer among three races in South Africa (Whites, Coloureds and Asians) has been investigated for the years 1968-1972, and the patterns of the occurrence of cases of cancer have been tested stochastically and mapped both separately and together. Information was not available for the Black population. Distinct differences in the distribution of lung and stomach cancer were found. Possible explanations for these differences are discussed.