# Risk-targeted ultrasound screening in high-incidence regions, tested against usual care

Source: https://onco.cc/ideas/idea-gbc-risk-targeted-ultrasound-in-high-incidence-regions/  
OnCo record `idea-gbc-risk-targeted-ultrasound-in-high-incidence-regions` (Idea). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

In parts of Chile and northern India gallbladder cancer is common enough that a cheap ultrasound programme aimed at the highest-risk people might catch it while surgery can still cure it. Nobody has run the trial.

## Summary

Sixty percent of Tata Memorial's 1,950 gallbladder cancer patients arrived with metastases and only 16 percent could be treated for cure; median survival was 58.2 months for early-stage against 4.2 months for metastatic disease. Risk is concentrated by geography (the Gangetic belt; southern Chile), ancestry (Mapuche), sex, gallstones and typhoid carriage, which makes a targeted rather than population programme plausible. Ultrasound is cheap and available. The risks are overdiagnosis of polyps and over-treatment of stones, which the Kaiser Permanente cohort shows are real in low-incidence settings; a high-incidence setting changes the arithmetic and only a randomised or cluster trial can show whether deaths fall.

## Fields

- Kind: Idea
- Last checked: 2026-09-24
- Tags: gallbladder-evidence
- Hypothesis: In districts with age-standardised gallbladder cancer incidence above 10 per 100,000, a risk-scored ultrasound screening programme for women aged 40 to 65 with gallstones or other risk factors will shift stage at diagnosis and reduce gallbladder cancer mortality by 20 percent within ten years.
- Rationale: Stage at diagnosis is the dominant determinant of survival; incidence in the target populations is high enough for a positive predictive value that low-incidence settings cannot reach.
- Proposed test: Cluster-randomised trial by district in Bihar or Uttar Pradesh and southern Chile, with usual care control, primary endpoint gallbladder cancer mortality at ten years, secondary endpoints stage distribution, cholecystectomy rate and overdiagnosis.
- Maturity: speculative
- Actor: policy

## Sources

- Patkar et al.: Tata Memorial gallbladder cancer registry, 60 percent metastatic at presentation (Cancer Epidemiol 2025): https://europepmc.org/article/MED/41237686
- Dutta et al.: epidemiology of gallbladder cancer in India (Chin Clin Oncol 2019): https://europepmc.org/article/MED/31484488

## Connected records

- cancers: [Gallbladder cancer](https://onco.cc/cancers/gallbladder/)
- technologies: [Ultrasound](https://onco.cc/technologies/ultrasound/)
- institutions: [Tata Memorial Centre](https://onco.cc/institutions/tata-memorial/)
- terms: [Gallbladder polyp (polypoid lesion)](https://onco.cc/terms/gallbladder-polyp/), [Overdiagnosis](https://onco.cc/terms/overdiagnosis/), [Prophylactic (preventive) cholecystectomy](https://onco.cc/terms/prophylactic-cholecystectomy/), [Screening](https://onco.cc/terms/screening/)
- bottlenecks: [Most of the world has almost no cancer care](https://onco.cc/bottlenecks/b-global-access/), [Overdiagnosis and false alarms](https://onco.cc/bottlenecks/b-overdiagnosis/), [The hardest cancers are found late](https://onco.cc/bottlenecks/b-early-detection/)
- key papers: [Epidemiology of gallbladder cancer in India](https://onco.cc/key-papers/paper-dutta-gallbladder-cancer-epidemiology-india-chin-clin-oncol-2019/), [Gallbladder cancer](https://onco.cc/key-papers/paper-roa-gallbladder-cancer-primer-nat-rev-dis-primers-2022/), [Hospital-based gallbladder cancer registry from a high-volume referral cancer centre in India: Insights into epidemiology and roadmap for enhancing cancer care](https://onco.cc/key-papers/paper-patkar-tata-memorial-gallbladder-cancer-registry-cancer-epidemiol-2025/), [Outcomes of Gallbladder Polyps and Their Association With Gallbladder Cancer in a 20-Year Cohort](https://onco.cc/key-papers/paper-szpakowski-gallbladder-polyps-20-year-cohort-jama-netw-open-2020/)
- roadmaps: [Gallbladder cancer roadmap: from a chance finding at gallstone surgery to a disease with its own trials](https://onco.cc/roadmaps/gallbladder-cancer-roadmap/)

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