Exhibit 165 · Cohort study
1-year risks of cancers associated with COVID-19 vaccination: a large population-based cohort study in South Korea
Data from 8,407,849 individuals between 2021 and 2023 were obtained from the Korean National Health Insurance database.
Using Korean National Health Insurance data on 8,407,849 Seoul residents for 2021–2023, the study reported significantly higher hazard ratios one year after COVID-19 vaccination for thyroid, gastric, colorectal, lung, breast and prostate cancer. Critics noted that the incidence gap was already present one month after vaccination (2.91 against 1.63 per 100,000), a timing that points to detection or selection bias rather than causation, and that the two groups were assigned different index dates.
- Source
- Hong Jin Kim, Min-Ho Kim, Myeong Geun Choi, Eun Mi Chun; Biomarker Research 13:114
- Date
- 26 September 2025
- Quoted from
- Abstract
- Grade
- Peer-reviewed
- Document
- https://doi.org/10.1186/s40364-025-00831-w
- Accessed
- 2026-11-09
- Cited by
- Findings citing this exhibit
- Note
- The one-month figures and critiques come from Science Feedback and a Frontiers in Public Health commentary.