Nationwide analysis of unplanned conversion during minimally invasive distal pancreatectomy for pancreatic adenocarcinoma.

Background: Utilization of minimally-invasive distal pancreatectomy (MIDP) for pancreatic adenocarcinoma has increased. While unplanned conversion to an open procedure during MIDP is associated with inferior short-term outcomes, the long-term consequences of conversion have not been adequately examined.

Methods: Patients with pancreatic adenocarcinoma undergoing MIDP were selected from the National Cancer Database (2010-2015) and subdivided based on the occurrence of unplanned conversion. Post-operative outcomes and overall survival (OS) were examined. Conversion was additionally compared to a matched group of planned open resections.

Results: Among 592 patients undergoing attempted MIDP, unplanned conversion occurred in 23.1%. Despite increased 90-day mortality among patients experiencing conversion, there was no difference in median OS between groups (25.0 vs 27.8 months, p = 0.095). For patients undergoing conversion, post-operative outcomes and long-term survival were similar when compared to a propensity-matched group of patients undergoing planned open resection. On multivariable analysis, treatment at an academic facility (OR 0.63) and a robotic approach (OR 0.50) were both significantly associated with completed MIDP.

Conclusion: Despite inferior post-operative outcomes compared to successful MIDP, unplanned conversion did not result in significantly reduced long term survival. MIDP can be attempted selectively but treatment at experienced centers via a robotic approach should be considered.