There is research indicating this. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3871217/

However, it would be foolish to just stop sugar without seeing a doctor and assume all is going to be well.

This. Read "Tripping over the truth" by Travis Christofferson and "cancer as a metabolic disease" by Seyfried.

I'd start with a 3 day water-only fast and then stay low calorie keto for a long time.