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Breast cancer. Coloured 3-D computed tomography scan of a woman's chest showing breast cancer. The scan shows a horizontal slice through the chest. The large orange area is a tumour in the woman's left breast. The grey area to the left is the other breast, which is unaffected. The two yellow areas in the centre are the lungs. Breast cancer is the most common cancer in women, affecting about 1 in 20. Successful treatment depends on early detection, as once the cancer has spread it is much harder to cure. Surgical removal of the tumour cures around a third of patients. Radiotherapy and anticancer drugs are often also required.
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