Once again, your body runs on sugar. More-complex carbs and proteins get broken down to glucose during the digestive process. If you somehow managed to stop your body from producing enough glucose to feed the cancer cells, your brain (among other organs) would fail as well

OTOH, since weight gain and diabetes are both common complications of hormone therapy, it is still a very good idea to go *extremely* easy on the refined sugar. Just don't expect it to stop your cancer. Best of luck, everyone!