>>8015609 lb
There is a lot of research already out there, so I suggest you get searching for both fenbendazole and mebendazole (the latter is human-approved and available online from overseas, OTC in some countries, although it has gone from 33 cents a pill to $100 a pill in the U.S. due to Pharmabro type chicanery -- they know what it is worth).
These compounds work, but probably not on all types of cancer. It seems to work against tumor-type cancers quite effectively.
For a QRD, the toxicity is low and roughly comparable between humans and dogs. So pretend like you were a 75kg (or whatever) dog and consider dosing accordingly. Consider a "loading" dose at the outset and be on the lookout for significant or unmanageable side effects.
If it starts working, I would consider a lower maintenance dose indefinitely. There are some studies where people went into remission, told their doctor what they were doing, doctor freaked out and convinced them to stop, and then they quickly relapsed and died.
Diet is going to be important. Sugars are tumor food, so cut those out immediately and consider something along the lines of ketogenic diet.