Abstract
The results of surgical treatment for ordinary carcinoma of the pancreas, even now considered the only means for cure, have been dismal. In order to define early pancreatic cancer, aiming amelioration of surgical results, early pancreatic cancer has been seeked. It may be readily conceivable that the smaller the tumor size, the earlier the lesion. The relationship between tumor size and surgical results was reviewed from the literature, some of which included articles written in Japanese. Tumor size ≤2 cm in diameter is not always an early cancer. Tumor <1 cm could be an early cancer but does not definitely reveal long-term survival. An increase of pancreatic cancer in Japan may be strongly related with the increased elderly population. Small cystic lesions which develop in elderly persons seem to indicate carcinogenesis of ordinary ductal cancer of the pancreas. Carcinoma in situ may be an early pancreatic cancer. Early pancreatic cancer is defined as an intraductal adenocarcinoma without any invasion or with minimal invasion to the stroma, regardless of size or extent of the lesion.
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