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Colorectal Cancer: Risk Prevention and Diagnosis
Dr Cyril Evbuomwan
Colorectal Cancer
• It is cancer of the large bowel and rectum
• It is the third most common cancer in men
• It is the second most common cancer in women
• It is the fourth most common cause of death from cancer globally
• 1.4m new cases and 700,000 death annually
Colorectal Cancer: Occurrence and risk factors
• Incidence increases with age peak around 70yrs of age
• Male sex
• Red meat and process meat consumption
• Overweight
• Alcohol
• Smoking
• Family history
• Medical conditions: polyp, Diabetes, IBD( inflammation of bowel)
Colorectal Cancer: Presentation
• Abdominal Pain
• Change in bowel Habit: constipation, diarrhoea, increased frequency
• Bleeding per rectum
• Anaemia with evidence of iron deficiency(present in 10%)
• Weight loss
• Signs of bowel obstruction
• Abdominal mass
Colorectal Cancer: Investigations
• Colonoscopy and biopsies
• Scan: CT colonography
• X-ray: Barium Enema
• FOB
• Some blood test
Colorectal Cancer: Prevention
• Adequate diet: Increased fibres like cereal, grain,
• Milk and cheese, calcium
• Aspirin
• Increased exercise
Bowel Cancer: Screening Programme(FOBT)
• England and Wales
• Invited every 2yrs from 60-74
• SCOTLAND
• FROM 50-74YRS
Bowel Cancer: Screening Programme
• Benefits
• Lowers risk of bowel cancer
• Can pick cancer at very early stage and improves outcome of treatment
• Can identify conditions which can lead to cancer in future
Bowel cancer: Screening Programme
• Risks
• Cancer not bleeding can be missed
• Blood from non cancer cause can lead to false positive result
• Cancer can develop in the 2yrs between screenin
Bowel Cancer screening: High Risk Persons
• Usually by colonoscopy and start early
• Those with genetic conditions that increase risk of bowel Cancer
• Strong family History
• Certain bowel conditions: Crohns Ulcerative Colitis
• Certain conditions like Acromegaly