Task: Answer Verification
Input (English): Question: Is survival after pancreaticoduodenectomy improved by extending resections to achieve negative margins?
Answer: Survival after pancreaticoduodenectomy is not improved by extending pancreatic resections to achieve negative margins after initially positive intraoperative frozen sections. Tumor-specific factors beyond the presence of disease at a surgical margin are responsible for the abbreviated survival seen in patients undergoing R1 resections.
Output (English): no