I don’t know if Ivermectin can be used to prevent cancer as well as treat it. But I’ve had cancer, and am taking the prophylactic dose anyhow, just in case.
One thing for sure. It cannot cause harm, so that’s a starting place. I wouldn’t take it and skip the doctor, but probably can’t hurt, and helps in other ways.
Early Ivermectin stopped covid in my wife and I. It was amazing how fast.