Cancer treatment has taken a new dimension, that is not just targeted, but also personalized to suit a particular patient. Personalized cancer vaccines, which is the most innovative method used to assist the immune system to identify and eliminate cancerous cells that tend to go undetected, is among the best innovations. In the case of patients who are fighting aggressive cancers with a high tendency of recurrence, these vaccines are giving them a new ray of hope and a formidable new defense mechanism.