1.   As for specific premalignant lesions, tubular adenoma in one patient harboured cancer in this study.

2.   Histological examinations at this time showed the papilla to have mild dysplasia and duodenal polyps to be tubular adenomas with mild dysplasia.

3.   Total colectomy was performed because of incomplete removal of a large tubular adenoma with intra-epithelial malignant change.

4.   Twelve colonic adenoma biopsy specimens were examined, of which six were tubular adenomas, three were villous adenomas, and three were tubulovillous adenomas.