Decision Modeling to Guide Management of Pancreatic IPMNs: Immediate Surgery or Initial Surveillance?

Area of Science:

• Gastroenterology
• Surgical Oncology
• Decision Analysis

Background:

• Distinguishing indolent branch duct intraductal papillary mucinous neoplasms (BD-IPMNs) from those with high-grade dysplasia or cancer is challenging.
• Surgery for BD-IPMNs carries morbidity, while surveillance risks delayed cancer detection.
• Current guidelines use fixed thresholds that may not suit individual patient variations.

Purpose of the Study:

• To compare immediate surgery versus initial surveillance for patients with BD-IPMNs.
• To develop a decision-analytic model incorporating patient-specific risk factors for BD-IPMN management.

Main Methods:

• A Markov decision model was employed to compare immediate surgery and surveillance strategies.
• The model incorporated patient age, comorbidities, and cyst location.
• Quality-adjusted life-years (QALYs) were the primary outcome, with data from published studies and the ACS-NSQIP database.

Main Results:

• Immediate surgery yielded a modest gain of 0.5 QALYs for a representative 60-year-old patient with mild comorbidities.
• Surgery reduced lifetime cancer probability (24.5% vs. 33.5%) and cancer mortality (9.3% vs. 20.3%) but increased low-grade dysplasia resections (55.0% vs. 15.3%).
• Age, baseline cancer probability, and perioperative mortality significantly influenced the optimal management strategy.

Conclusions:

• Immediate resection provides a modest advantage for younger, healthier patients with BD-IPMNs under surgical consideration.
• Surveillance is a more appropriate strategy for older or comorbid patients.
• Management decisions for BD-IPMNs should be individualized and risk-based, moving beyond universal guideline thresholds.