# Stop watching stable low-risk pancreatic cysts after five years

Source: https://onco.cc/ideas/idea-prev-ipmn-surveillance-stop-rule/  
OnCo record `idea-prev-ipmn-surveillance-stop-rule` (Idea). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

Small pancreatic cysts turn up on abdominal scans and are then followed for life. Low-risk cysts under 2 cm that are unchanged at five years rarely turn to cancer in Japanese and US cohorts, so a randomised trial of stopping surveillance would test whether years of scans can be spared.

## Summary

Low-risk branch-duct IPMN under 2 cm that is stable at five years has low malignancy rates in Japanese and US cohorts, but guidelines diverge. Propose a randomised trial of surveillance cessation versus continued surveillance for stable low-risk cysts, with pancreatic cancer incidence and imaging burden as endpoints.

## Fields

- Kind: Idea
- Last checked: 2026-09-08
- Hypothesis: Cessation after five years of stability results in pancreatic cancer incidence under 1% over five further years, non-inferior to continued surveillance.
- Rationale: Lifelong surveillance carries cost and anxiety; event rates in stable cysts are low.
- Proposed test: 2,000-patient multicentre RCT.
- Maturity: speculative
- Actor: clinic

## Sources

- Bottleneck evidence (Overdiagnosis and false alarms): Welch & Black, Overdiagnosis in cancer (JNCI 2010): https://doi.org/10.1093/jnci/djq099

## Connected records

- cancers: [Intraductal papillary mucinous neoplasm and other pancreatic cystic precursors](https://onco.cc/cancers/ipmn-cystic-precursors/), [Pancreatic ductal adenocarcinoma](https://onco.cc/cancers/pancreatic/)
- fronts: [Early Detection & Screening](https://onco.cc/fronts/early-detection/), [Imaging](https://onco.cc/fronts/imaging/)
- technologies: [MRI](https://onco.cc/technologies/mri/)
- bottlenecks: [Overdiagnosis and false alarms](https://onco.cc/bottlenecks/b-overdiagnosis/)
- key papers: [Overdiagnosis in cancer](https://onco.cc/key-papers/paper-welch-j-natl-cancer-inst/)

---
JSON: https://onco.cc/api/v1/entities/idea-prev-ipmn-surveillance-stop-rule.json