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Related Experiment Videos

The adenoma to carcinoma sequence.

R P Tierney1, G H Ballantyne, I M Modlin

  • 1Department of Surgery, Yale University School of Medicine, West Haven, Connecticut.

Surgery, Gynecology & Obstetrics
|July 1, 1990
PubMed
Summary

Colorectal adenomas are premalignant lesions that can transition to carcinoma. Factors like size, villous features, and dysplasia indicate increased malignancy risk in adenomas.

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Area of Science:

  • Gastroenterology
  • Oncology
  • Pathology

Background:

  • Adenomas frequently coexist with primary colon carcinoma, suggesting a premalignant role.
  • Histopathologic studies confirm the adenoma-to-carcinoma transition.
  • Risk factors for adenoma malignancy include size, villous architecture, and dysplasia.

Purpose of the Study:

  • To investigate the premalignant potential of colorectal adenomas.
  • To explore the histopathologic and molecular evidence supporting the adenoma-to-carcinoma sequence.

Main Methods:

  • Detailed histopathologic examination of adenomas and carcinomas.
  • Analysis of dysplasia in adenomas and its association with carcinoma.
  • Histochemical investigations of DNA content, enzyme activities, CEA expression, and mucin composition in adenomas and carcinomas.

Main Results:

  • Adenomas exhibit a transition to carcinoma, with risk escalating with size, villous features, and dysplasia.
  • Dysplasia in adenomas shares features with carcinoma, particularly in chronic ulcerative colitis.
  • Familial polyposis demonstrates the progression from adenomatous polyps to colorectal cancer.
  • Shared abnormalities in DNA content, enzyme activities, CEA expression, and mucin composition exist between adenomas and carcinomas.

Conclusions:

  • Colorectal adenomas are premalignant lesions that progress to carcinoma through a well-defined sequence.
  • Malignancy potential is indicated by histologic transition and disruptions in genetic and biochemical cellular control mechanisms.

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