- Histologically confirmed adenocarcinoma of the pancreas or ampulla of Vater; at least the majority of the histopathologic specimen must be identified as adenocarcinoma as opposed to another histologic subtype. In patients with a diagnosis of recurrent disease (based on radiographic progression and/or rising CA19-9 levels) and a history of a biopsy-proven adenocarcinoma of the pancreas or the ampulla of Vater, repeat biopsy of the recurrence site is not required for participation of the trial.