Related Experiment Videos
Epidemiology of colorectal polyps
A Giacosa1, F Frascio, F Munizzi
1Gastroenterology, Endoscopy and Nutrition Unit, National Cancer Research Institute, Genoa, Italy. attilio.giacosa@istge.it
Techniques in Coloproctology
|January 25, 2005
Summary
Colorectal adenoma prevalence varies globally, with higher rates detected by colonoscopy than sigmoidoscopy. Risk factors include alcohol consumption and potential gene-environment interactions, while new technologies may alter future prevalence data.
Area of Science:
- Gastroenterology
- Oncology
- Epidemiology
Background:
- Colorectal adenomatous polyps show significant international prevalence variation.
- Adenoma prevalence is higher in asymptomatic, average-risk individuals undergoing colonoscopy ( >25%) compared to sigmoidoscopy ( ~10%).
- Colorectal cancer prevalence remains low (<1%) in this demographic.
Purpose of the Study:
- To summarize current data on colorectal adenoma prevalence and risk factors.
- To highlight the impact of evolving endoscopic technologies on detection rates.
- To explore gene-environment interactions in colorectal tumorigenesis.
Main Methods:
- Review of existing epidemiological data on adenoma prevalence.
- Analysis of cumulative incidence rates for new adenomas post-endoscopy.
- Examination of identified risk factors, including diet, smoking, alcohol, and genetic polymorphisms.
Main Results:
- Colonoscopy detects significantly more adenomas than flexible sigmoidoscopy.
- Cumulative incidence of new adenomas within 3 years is higher after colonoscopy (27%) than sigmoidoscopy (7%).
- Alcohol consumption, ADH3 polymorphism, and folate's effect on K-ras mutations are implicated as risk factors.
Conclusions:
- Colorectal adenoma prevalence is influenced by detection methods and geographical location.
- Technological advancements like chromoendoscopy and magnifying endoscopy may impact future prevalence data.
- Understanding gene-environment interactions is crucial for colorectal cancer prevention strategies.