Cancer isnt one disease, its thousands of diseases with thousands of different variations, no two cancers is the same, this is why scientists, some of them, say we will never cure it.
Beyond that, often when cancer is detected its too late and it has spread to other organs, some cancers may be stuck to something vital like your brain or heart, complicating things, usually when you get sick from cancer its already too late, when cancer is detected in early stages its more manageable.
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