Tumour Biology in Relation to Chemotherapy
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Cancer is not a single disease, but a group of disease entities related by the manner in which they grow, spread and behave. Consequently, individual tumours, even those from the same organ, may vary in their biological activity. Cancer may also be defined as an abnormal accumulation of transformed cells which grow and spread and which do not respond in a normal way to the growth-regulating systems of the organism. Such a simple definition, however, hides many basic biological problems.
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