Cancer malignant tumours drugs used

Usually some 50% of malignant tumours in man initiate colonies in remote sites. Hence chemotherapy, which used to be reserved for terminal cases, is now introduced at the beginning of treatment, as soon as the mass of a solid tumour has been removed by surgery or radiation. This is done because drugs can reach out, far beyond the surgeon s knife and radiotherapist s rays, to destroy metastatic colonies of cancer cells anywhere in the body. Some 50 anti-cancer drugs have now been established as clinically useful (see Sections 5.0 and 6.3f). 

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