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Chemotherapy is a drug treatment for cancer using substances that exert their effects in a targeted manner on certain disease-causing microorganisms or cells and kill them or inhibit their growth. In the treatment of malignant tumours most of these substances affect the rapid proliferative potential of tumour cells, as these respond more sensitively than normal cells to disturbance in cell division. However, on healthy cells with similar proliferative potential they have a comparable effect, resulting in side effects such as blood disorders or diarrhoea.