An international comparative study was made of gastric carcinoma in order to determine whether or not the tumor showed any different morphological features In different countries. The series were from Japan, Korea, U.S.A., New Zealand, and Chile. Further comparison was made at different time periods in U.S.A., New Zealand, and Japan. It was found that there was no significant difference in histological appearance of gastric carcinoma both in different countries and at different times. Some statistical data indicate that the same and common factor may be operating throughout the world as a gastric carcinogen.
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Toshio Kubo (1974) studied this question.
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