Endoscopic Management of Suspected Biliopancreatic Disease Within the Lombardy Pancreas Units: a Prospective Observational Study

Despite advances in oncological therapies, pancreatic cancer remains one of the leading causes of cancer-related mortality worldwide, with an increasing burden projected over the coming decades. The diagnostic and therapeutic pathway of biliopancreatic malignancies is complex and requires a high level of multidisciplinary expertise, particularly in high-volume referral centers organized as Pancreas Units.

Endoscopic ultrasound (EUS) plays a central role in the diagnostic work-up of biliopancreatic and periampullary lesions, allowing high-resolution morphological assessment and, when indicated, tissue acquisition through fine-needle aspiration (FNA) or fine-needle biopsy (FNB). Accurate histological diagnosis is essential for therapeutic decision-making, including surgical planning, systemic therapy, and molecular profiling.

The Lombardy Region has adopted a Hub-and-Spoke organizational model for Pancreas Units, defining minimum procedural volumes, expertise requirements, and performance benchmarks for referral centers. However, a centralized prospective system for monitoring endoscopic activity, diagnostic performance, and procedural outcomes across these centers is currently lacking.

The GENTLENESS study has been designed to prospectively collect real-world data on EUS procedures performed in Lombardy Pancreas Unit Hub centers, with the primary objective of evaluating the diagnostic accuracy of EUS-guided biopsies. Secondary objectives include assessment of procedural volume, sampling techniques, need for repeat biopsies, complication rates, and time intervals from procedure to definitive diagnosis and initiation of treatment.

The study is observational, does not introduce changes to clinical practice, and reflects routine patient management pathways. Any future analyses beyond the scope of the present registry will require separate Ethics Committee approval.