Pancreatic cancer is tough and generally recurs quickly even after a successful Whipple in which margins and lymph nodes are clear. My Mom's cancer started from a different type of IPMN and despite a successful surgery with only a 1.1 cm of cancer in the IPMN, the cancer recurred in the peritoneum about 18 months later and she's been bravely fighting it ever since. I would encourage you to have the surgery and remove the IPMN now regardless of the biopsy results. It's not worth taking a chance. The Whipple is hard, but if you have a good surgeon at a top hospital, you will get through it fine. It's much worse dealing with chemo and a potential recurrence later on.