Back to today’s briefing

Story perspectives

Study Links COVID Vaccination to Six Cancer Risks

9/28/2025

42 4

Summary

Story summary

In Seoul, South Korea, a 2021–2023 study of 8,407,849 people assessed cancer risk after COVID-19 vaccination.
Vaccinated men had higher gastric and lung cancer risks; women had higher thyroid and colorectal risks.
Under 65 saw thyroid and breast cancers; 75+ saw prostate cancers.
Six cancers linked to vaccination—thyroid, gastric, colorectal, lung, breast, prostate—with varying associations; more research needed.

1 of 1

Story summary

In Seoul, South Korea, a 2021–2023 study of 8,407,849 people assessed cancer risk after COVID-19 vaccination.
Vaccinated men had higher gastric and lung cancer risks; women had higher thyroid and colorectal risks.
Under 65 saw thyroid and breast cancers; 75+ saw prostate cancers.
Six cancers linked to vaccination—thyroid, gastric, colorectal, lung, breast, prostate—with varying associations; more research needed.