DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Radiotherapy for colon cancer. Laser beams identifying the exact location of a tumour for the delivery of radiation treatment. Radiotherapy is used to treat a range of cancers, often in combination with surgery or chemotherapy. Colon cancer is one of the most common cancers in the Western world. It is a disease of late and middle age. Risk factors include a diet high in animal fat and low in fibre and a sedentary lifestyle.
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