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Radiotherapy and Chemotherapy for Colorectal Cancer [Abridged]

One of the central dogmas of cancer surgery has been the belief that cancers should be treated initially by radical resection of the primary tumour and the regional nodes. In recent years, however, in treating external cancers such as melanomas and cancers of the mouth, breast and lower rectum, some surgeons have had success with graded approaches, in which the primary tumour is removed or destroyed and the area of lymph drainage is left undisturbed unless evidence ofmetastasis appears.