Can the Keto diet prevent or treat cancer?

Positive media regarding keto is hitting the mainstream:
Quoted in this article are Dr Seyfreid and Poff who i  met at a conference in Tampa last year.

https://health.usnews.com/health-care/patient-advice/articles/2018-04-02/can-a-keto-diet-slow-the-growth-of-breast-cancer