The ‘first in man’ series of vaccine injections given directly into a pancreatic cancer tumor is not only well tolerated, but also suggests an “encouraging” period of stable disease, a study shows. Vaccine therapies are designed to strengthen the body’s immune defenses. In a previous study, investigators showed that using a vaccine treatment for bladder and breast cancer tumors in laboratory models resulted in a reversal of the traditional immune blockade, as well as the development of tumor specific immunity throughout the body.