@Sheryl you are of course correct in the fact that we have no studies on humans with anti-parasitic drugs. However there are some very encouraging anecdotal cases worth checking out, more with Fenbendazole than with Ivermectin. And knowing that big, randomised, double blind, placebo controlled trials are very expensive and will never be funded by big pharma, when there is no potential to recover the investment. The drugs in question are out-of-patent, cheap and generic drugs, and safe for humans.
Would I try these drugs if I had cancer? You bet I would, why not? Would I turn down traditional treatment? That would depend on the specific case, type of cancer, progression, probability of cure, etc.
There is also now renewed interest in Otto Warburg's close to 100 year old theory of cancer as mainly a metabolic disease, where most cancers prefer sugar as fuel (apparently pancreatic cancer cells can also thrive on ketones). The damaged DNA theory has not yielded much in terms of inroads into beating cancer, and the drugs in this class are extremely expensive and not that effective. There is now some who thinks that the DNA damage is not the direct cause of cancer, but rather a result of damaged mitochondria. More research is obviously needed here, but it can seem promising.
So there is more to this complex problem than we might think, and if we do not try simple, safe and cheap alternatives we will have to wait a very long time for big pharma and the established medical science to help us. And we better be rich!