Fatih - no one person (especially a single politician) is going too solve this decades-old issue. It would be great if it could be the case - but let's get real.
If there was a 'cure' for cancer (and there are so many different kinds; reactive and so many proposed new curative ones that are 'the one') - the power and prevalence would lie with the pharmaceutical companies - and all the political complexities that they hold.
Medicine is only so powerful. They are nowhere as near as powerful as the systems that govern them.
It's something non-medical people say. There is no one cure because there are so many different types of cancer. If he eradicated cancer first though, then he would definitely become president lol. But there is always prayer don't forget :)