Pancreatic cancer is a very aggressive disease. It is the 4th leading cause of cancer deaths in the USA. Only 6% of patients who can undergo surgery will survive past five years. Late diagnosis and lack of good treatment options are some of the reasons for this outcome. Recent progress in cancer immune therapy showed effect in cancers such as relapsed leukemia and metastatic melanoma. Unfortunately, immune therapy was not effective in patients with pancreatic cancer. One explanation for this result is that pancreatic cancer blocks immune responses against cancer. Thus, understanding how cancer promotes immune suppression is vital to our ability to treat this deadly disease. Our initial work has revealed that B cells promote growth of pancreatic cancer. However, it is not clear how B cells promote cancer growth, and how targeting these cells can benefit patients. We propose to understand how B cells function in pancreatic cancer. The goal of this research project is to find new targets that can block immune suppression in pancreatic cancer. Using both mouse models of pancreatic cancer and patient samples, we hope to identify B cell based targets in pancreatic cancer. We ultimately hope to translate our findings into effective therapies that may also work with existing immune therapy treatments.