Preventing bowel cancer: an insight for clinicians

Area of Science:

• Oncology
• Gastroenterology

Background:

• Colorectal cancer (CRC) is a leading cause of cancer death globally and in the UK.
• Prognosis is heavily dependent on cancer stage at diagnosis, with localized disease having a 90% 5-year survival rate compared to 50% overall.
• Most CRCs develop from adenomatous polyps, highlighting the potential for prevention through early detection and removal.

Purpose of the Study:

• To review the natural history of colorectal cancer.
• To evaluate various colorectal cancer screening modalities.
• To discuss the UK National Health Service's fecal occult blood screening program and the influence of diet and aspirin on CRC etiology.

Main Methods:

• Literature review on colorectal cancer natural history and screening.
• Evaluation of current screening techniques including fecal occult blood tests and endoscopic procedures (flexible sigmoidoscopy, colonoscopy).
• Discussion of etiological factors such as diet and aspirin use.

Main Results:

• Colorectal cancer incidence and mortality rates are substantial worldwide and in the UK.
• Early-stage detection dramatically improves survival outcomes.
• Screening offers a viable strategy to reduce CRC incidence and mortality by interrupting the adenoma-adenocarcinoma sequence.

Conclusions:

• Early detection and screening are paramount in reducing colorectal cancer mortality.
• Current screening options include fecal occult blood testing and endoscopic assessments.
• Dietary factors and aspirin may play a role in colorectal cancer development and prevention.