My dad was a colon cancer survivor. When I was diagnosed he told me that the first people to leave treatment were those who were angry. They didn't view treatment as something being done to them, but instead something they were doing to cancer. Attack mode. Claws and fangs. My iPhone screen was the scene from Braveheart where William Wallace, bloodied from battle faces a mounted foe and yells at the top of his lungs.

It worked for me