Cancer cant have a "cure" in the typical sense. It is not a virus, it is not bacteria, it is a genetically defective cell growth that spreads through out your body and destroys what it can. (very abridged)
There can be no single "cure" for cancer. It must be tailored to the individual. We are only starting to see breakthroughs in this. Cancer, is also genetically based in most cases. There are ways to slow cancer growth and even prevent it, or move it further down the road of life by living a better life style and avoiding certain substances.
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WHat do you think radiation treatment even is? It... its designed to sorta try to kill you, just to kill those specific cells