In this experimental study, all patients will be given a strong combination of antitumor chemotherapy while receiving injections of an immunotherapy drug consisting of two types of pancreatic cancer cells that have been modified to make them more easily recognized and attacked by the immune system. The investigators propose to test this new treatment paradigm along with stereotactic body radiation in patients with borderline resectable pancreatic cancer to demonstrate that treatment with this combination of therapies increases the time until the tumor progresses as well as overall survival.