SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY
Colon cancer. Coloured scanning electron micrograph (SEM) of cancer cells from the human colon (large intestine). Cancerous (malignant) cells divide rapidly and uncontrollably and are able to invade and destroy surrounding tissue. Cancer of the colon is also known as colorectal cancer. It is one of the most common cancers in developing countries, often beginning as an intestinal polyp (adenoma) which then becomes cancerous. Symptoms include blood in the faeces, constipation or diarrhoea, and abdominal pain. Treatment often involves surgery and the use of anti-cancer drugs.
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