Colorectal Cancer

Colorectal cancer is the third most common malignancy in the United Kingdom, with around 34,000 new cases diagnosed annually, and exhibits a 5-year survival rate between 63% and 73%. It arises from abnormal cell growth in the colon or rectum, most commonly as adenocarcinoma, and often develops from precancerous polyps. The liver is the most frequent site of recurrence after curative surgery. Risk factors include age over 45, genetic predisposition, lifestyle factors, and inflammatory bowel disease. Early-stage disease may be asymptomatic, but symptoms such as altered bowel habits, blood in stool, abdominal pain, and unexplained weight loss may occur as it progresses. Screening methods like colonoscopy are vital for early detection and prevention. The disease is characterized by molecular alterations including chromosomal instability, and treatment strategies vary by stage, ranging from surgery for early cases to systemic therapies for advanced disease. Colorectal cancer remains one of the most prevalent cancers globally, underscoring the importance of awareness, screening, and timely intervention.
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