Not a vaccine but could help.
Soursop: The Vitamin C Superfruit that May Help Fight Cancer
https://draxe.com/soursop/
http://www.lifeextension.com/Vitamins-Supplements/item21530/Graviola?sourcecode=PPL602W&gclid=CjwKCAiA8P_TBRA9EiwAJrpHM4DkN9Hso8r7oNPWOoPnGxSqHD-KPJ8und06D_LBriigNbw_i9tKpBoCEJQQAvD_BwE
Many people have nausea with it but probably no worse than nausea from chemotherapy.