Colon polyps and cancer.

Area of Science:

• Gastroenterology and Oncology
• Preventive Medicine
• Cancer Screening

Background:

• Colorectal cancer (CRC) mortality is best reduced through screening for colorectal neoplasia.
• Current screening methods like fecal occult blood tests and endoscopy face compliance challenges.
• Emerging technologies like colonography and fecal DNA testing are not yet suitable for population screening.

Purpose of the Study:

• To review current strategies for colorectal cancer screening and diagnosis.
• To discuss advances in the prevention and management of colorectal adenomas and cancer.
• To evaluate the effectiveness and limitations of various diagnostic and surveillance methods.

Main Methods:

• Review of current literature on colorectal cancer screening, diagnosis, and prevention.
• Analysis of new findings regarding aspirin's role in adenoma recurrence.
• Evaluation of dietary factors, biomarkers, and endoscopic surveillance techniques.

Main Results:

• Long-term aspirin use shows preventive effects on adenoma recurrence, though optimal dosage and mechanism (involving cyclooxygenase-2) require further study.
• Low fiber intake, not low folate consumption, is associated with adenoma risk.
• Endoscopic surveillance remains suboptimal, prompting efforts to reduce endoscopy frequency and pathologist workload.

Conclusions:

• Fecal occult blood test programs combined with endoscopy are crucial for CRC mortality reduction.
• Selective diagnostic strategies aim to minimize unnecessary procedures for symptomatic patients.
• Advances in surgery, radiotherapy, and interventional endoscopy (argon plasma coagulation, metal stents) improve rectal and colonic cancer management.