I was watching "The Magic Pill" documentary series on Netflix. And, a woman indicated that she completely cured a fairly aggressive breast cancer by eliminating just about all sugars and most carbohydrates. She followed a very strict keto diet. Having done a bit of research on the issue, I could not find any solid scientific evidence and/or replication of her experience.
I don't doubt this woman did cure herself in the fashion she did. I just suspect there may have been a ton of confounding factors that she did not take into account. And, instead attributed 100% of her cure to her diet alteration only.