Of what? Just interested in your reason. I have no opinion one way or the other but then Annie Bella does not have cancer. If she did, I might try anything.
Mostly wondering about the method in which it works and the safety of the procedure.
Vaccines work on viruses by inoculating your body with an inactivated (in most cases) strain of the virus which causes your immune system to safely manufacture antibodies against it. This way our bodies are prepared for the real thing when and if we get infected. Cancer isn't a virus at all. It happens when cell growth gets out of control and the body is tricked into thinking it's normal. How is a vaccine going to prevent against that, especially when the dog already has cancer?
If it works, that's fantastic! I'm not trying to be a nay-sayer, it's just that I'm always hesitant about new procedures because no one knows what the long-term consequences will be.