# Ultrasound restraint and surveillance to reverse thyroid cancer overdiagnosis

Source: https://onco.cc/ideas/idea-thyroid-overdiagnosis-reversal/  
OnCo record `idea-thyroid-overdiagnosis-reversal` (Idea). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

Most thyroid cancers found today would never have hurt anyone. Screen less, watch small ones, and operate only when they grow.

## Summary

The idea is that health systems can reverse thyroid cancer overdiagnosis by screening less with ultrasound, adopting TI-RADS thresholds for biopsy, and placing papillary cancers of 1 cm or less under active surveillance, operating only when they grow. Incidence has tripled in many countries since the 1990s while deaths stayed flat, autopsies find occult papillary cancer in many adults, and the Kuma Hospital and MSK cohorts show surveillance is safe. The hypothesis is that these policies can halve thyroidectomy rates without increasing thyroid cancer deaths; South Korea's screening-driven epidemic reversed once screening was discouraged. The test is registry comparison before and after policy change; the idea addresses the overdiagnosis bottleneck.

## Fields

- Kind: Idea
- Last checked: 2026-09-07
- Hypothesis: Health systems adopting TI-RADS biopsy thresholds and active surveillance for ≤1 cm papillary cancers can halve thyroidectomy rates without increasing thyroid cancer mortality.
- Rationale: Autopsy studies find occult papillary cancer in up to a third of adults; Kuma Hospital and MSK cohorts show safety of surveillance.
- Proposed test: Regional registry comparisons before and after policy change (South Korea already provides a natural experiment); prospective surveillance cohorts outside Asia.
- Maturity: being-tested-at-scale

## Sources

- Ahn et al., Korea's thyroid cancer epidemic: screening and overdiagnosis (NEJM 2014): https://doi.org/10.1056/NEJMp1409841

## Connected records

- cancers: [Thyroid cancer](https://onco.cc/cancers/thyroid/)
- technologies: [Active surveillance of papillary microcarcinoma](https://onco.cc/technologies/active-surveillance-thyroid/), [Thyroid nodule FNA, Bethesda cytology & molecular classifiers](https://onco.cc/technologies/thyroid-fna-molecular/), [Ultrasound](https://onco.cc/technologies/ultrasound/)
- key papers: [Korea's thyroid-cancer "epidemic"--screening and overdiagnosis](https://onco.cc/key-papers/paper-ahn-n-engl-j-med/)
- bottlenecks: [Overdiagnosis and false alarms](https://onco.cc/bottlenecks/b-overdiagnosis/)

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