Population screening for colorectal cancer: faeces, endoscopes or X-rays?

Area of Science:

• Oncology
• Gastroenterology
• Preventive Medicine

Background:

• Colorectal carcinoma (CRC) is a leading cause of cancer death, with rising incidence and treatment costs.
• Precursor lesions offer opportunities for early detection and intervention in CRC.
• Effective screening strategies are crucial for reducing CRC mortality and healthcare burden.

Purpose of the Study:

• To evaluate current and emerging colorectal cancer screening modalities.
• To assess the cost-effectiveness and preventive impact of different screening methods.
• To identify the most suitable screening options for population-based implementation in Europe.

Main Methods:

• Review of existing literature on colorectal cancer screening methods.
• Analysis of mortality reduction data for fecal occult blood tests (FOBT).
• Comparison of participation rates and preventive effects of flexible sigmoidoscopy and colonoscopy.

Main Results:

• Biennial FOBT screening reduces CRC mortality by 14-18%.
• Five-year flexible sigmoidoscopy screening is cost-effective and offers higher prevention rates at similar participation.
• Screening colonoscopy provides complete visualization but has higher participant burden and resource demands.

Conclusions:

• Fecal occult blood testing and flexible sigmoidoscopy are currently the most suitable modalities for colorectal cancer screening in Europe.
• Emerging methods like fecal DNA testing and CT colonography show promise but require further development.
• Early detection through appropriate screening significantly impacts colorectal cancer outcomes.