Premium
Dna distribution pattern of the so‐called severe dysplasias and small carcinomas of the colon and rectum and its possible significance in the tumor progression
Author(s) -
Hamada Shinshichi,
Itoh Ryoji,
Fujita Setsuya
Publication year - 1988
Publication title -
cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.052
H-Index - 304
eISSN - 1097-0142
pISSN - 0008-543X
DOI - 10.1002/1097-0142(19880415)61:8<1555::aid-cncr2820610812>3.0.co;2-w
Subject(s) - rectum , dysplasia , aneuploidy , pathology , ploidy , carcinoma , biology , medicine , chromosome , genetics , gene
The DNA distribution pattern was determined by cytofluorometry in 25 cases of colorectal small carcinoma and the so‐called severe dysplasia. The colorectal carcinoma and “severe dysplasia” consisted of four principal stemlines as to DNA ploidy: diploidy, aneuploidy, and their respective polyploidies. These patterns appeared in various combinations in individual neoplasms. DNA distribution of the severe dysplasia was diploid‐predominant (11 cases) or aneuploid‐predominant (three cases), usually showing mosaicism in various degrees with respective first order polyploidy. Similar DNA distribution patterns also were found in submucosally invasive small carcinomas. The neoplastic cell populations of a higher polyploidy (second or third order), however, occurred only in the submucosally invasive carcinomas (three cases) regardless of their basic ploidy. The mitotic index tended to be higher in the aneuploid‐predominant tumors than in the diploid‐predominant tumors. In the current observation, there was no significant correlation between the DNA distribution pattern and histologic type of the “dysplasia” or carcinoma. We found that most of the so‐called severe dysplasias of the colon and rectum already gained definitive characteristic of carcinoma in the DNA pattern, i.e. , ploidy heterogeneity. Therefore, they can be identified as intramucosal carcinomas, distinct from the normal epithelia and adenomas of the colon and rectum.