Bevacizumab, Capecitabine, and Oxaliplatin in Treating Advanced Small Intestinal or Ampulla of Vater Adenocarcinoma

This phase II trial studies how well bevacizumab given with capecitabine and oxaliplatin work in treating participants with small bowel or ampulla of Vater adenocarcinoma that has spread to other places in the body. Monoclonal antibodies, such as bevacizumab, may interfere with the ability of tumor cells to grow and spread. Drugs using in chemotherapy, such as capecitabine and oxaliplatin, work in different ways to stop the growth of tumor cells, either by killing the cells, by stopping them from dividing, or by stopping them from spreading. Giving bevacizumab, capecitabine, and oxaliplatin may work better in treating participants with small intestinal or ampulla of Vater adenocarcinoma.