🔥🤬🔥Most COVID-19 Vaccination & Elevated Cancer Risks Within One Year

New South Korean Cohort Study of 8.4 Million Reveals Potential Associations Between COVID-19 Vaccination and Elevated Cancer Risks Within One Year

A large-scale retrospective cohort study published on September 26, 2025, in Biomarker Research examined health records from over 8.4 million adults in Seoul, South Korea, between 2021 and 2023, finding that individuals vaccinated against COVID-19 showed a 27% higher overall hazard ratio (HR 1.27) for cancer diagnoses within the first year compared to unvaccinated controls, after propensity score matching.

Specific increases included prostate cancer (HR 1.69, 69%), lung cancer (HR 1.53, 53%), thyroid cancer (HR 1.35, 35%), gastric cancer (HR 1.34, 34%), colorectal cancer (HR 1.28, 28%), and breast cancer (HR 1.20, 20%), with variations by vaccine type (mRNA vs. cDNA-based) and demographics like age and sex.