> Do you have any scientific backing to support those claims?

Not OP but this is a good summary: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3946160/

> Then I see the claim that it cures cancer and forgive me if all my alarm bells go off.

I think OP was implying that it may decrease your chances of getting cancer not cure it. Everyone will get cancer if they live long enough (based on the current state of medicine, that may change in the future).

edit: I should say that personally I don't really practice intermittent fasting (at least not consciously). But I don't eat after 8pm either, so I tend to do at least a 12 hour fast every day because of that. Sometimes I also skip breakfast which makes it a 16-18 hour fast. My biggest meal of the day is usually lunch not dinner.