Given the very low cost, it could make sense as a sort of prophylactic in individuals who are genetically predisposed to certain cancers, that is if the health risks are minimal. I recall from having my Lab treated for cancer that practically all human protocols came to us through veterinary trials, that canine and human response to cancer treatments is very similar, medically speaking. What are the risks to dogs, of lengthy exposure to Panacur-C? Anybody got a package? Just curious.
Joe Tippens says he will be taking the panacur and supplements for the rest of his life. So long term use of this dewormer must be OK. At least for him and some others. Maybe some people cannot handle it.
Actually I am not that surprised that a modern dewormer can be powerful in other ways such as anti-cancer, at least for some people. They have to be strong to get rid of worms.
More on the active chem in panacur. It can be toxic. https://en.wikipedia.org/wiki/Fenbendazole