Why do doctors wait for cancer to progress to a further stage before prescribing certain treatments like immunotherapy?
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Cancer treatment is VERY dangerous. In many cases it might kill faster than illness itself. Meanwhile early stages of cancer are often quite responsive to lighter drugs.
As a rule of thumbs – you want to treat, not to kill. And thus you will not use potentially lethal treatment before you tried safer options and cancer development pattern gives you time for such trials.
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