Cancer utilizes both glucose and Glutamine. Warburg missed the Glutamine connection. Check out Thomas Seyfried.

FenBen is a partial glutamine blocker, so to be effective it requires fasting and exercise to be effective at starving the cancer.

I think some cancers are caused by viruses, which is an obligate parasite and Ivermectin and Fenben both block viruses. Note cells that are infected with viruses also can only utilize glucose and glutamine so the same anti cancer strategy works with them too.

Bottom line is that becoming fat adapted on a zero carb diet (carnivore) where the body consistently survives on lipids and ketones prevents cancer from ever becoming an issue, as well as heart disease, diabetes, auto immune diseases, etc.