South Korea: Steep Rise in Cancer Rates After C-19 Shots

Amber Baker
November 4, 2025

A new, peer-reviewed study by researchers in South Korea has found that people who received COVID-19 shots showed significantly higher rates of developing several cancers—including thyroid, stomach, colon, lung, breast, and prostate—compared to unvaccinated individuals. The research, published on Sept. 26, 2025 in the journal Biomarker Research, was authored by South Korean medics in orthopedic surgery and critical care and evaluated data from over eight million adults in the Korean National Health Insurance database to identify a potential link between COVID mRNA shots and cancer risk within one year after receipt of different types of vaccines.¹

The data indicate that vaccinated individuals had roughly a 35 percent greater increased risk of thyroid cancer and 34 percent greater risk of gastric cancer, with lung and prostate cancers showing even higher relative risks—53 percent and 68 percent respectively. Breast and colorectal cancers showed increases of 20 percent and 28 percent. The authors of the study noted that vaccinated men were more likely to develop gastric and lung cancers, while vaccinated women were more likely to develop thyroid and colorectal cancers.¹

The researchers also observed that cancer risk patterns differed by the platform used to produce the biological products: DNA-based (cDNA) vaccines were linked to thyroid, stomach, colon, lung, and prostate cancers; mRNA vaccines were linked to thyroid, colon, lung, and breast cancers; and mixed (heterologous) vaccines were linked to thyroid and breast cancers. However, the researchers cautioned that the findings represent a statistical association, not proof of causation, emphasizing the need for further research to determine whether the increases reflect a biological effect or are influenced by other factors such as healthcare access, screening frequency, or population demographics.¹

Global Cancer Trends Mirror Korean Study Findings

In South Korea and other countries, several of the same cancer types identified in the study have shown upward incidence trends in the years immediately following widespread vaccination campaigns seen during the pandemic. Notably, the cancers found to be statistically higher one year after vaccination in the South Korean study—such as thyroid, colorectal, lung, breast, prostate, and gastric cancers—align with those showing documented increases in national cancer registries since 2021.²

Some medical professionals caution, however, that these patterns may also reflect non-vaccine factors, including pandemic-related health care disruptions, delayed diagnoses, expanded screening programs, or an aging population—all of which can elevate reported incidence rates. Yale Medicine reports that rates of early-onset breast, colorectal, stomach, thyroid, and prostate cancers have been rising for years across multiple countries.³

Florida Surgeon General Warned of “Cancer-Causing” DNA Fragments in COVID Shots

The South Korean study follows warnings from Florida Surgeon General Joseph Ladapo, MD, PhD, who in 2023 urged the U.S. Food and Drug Administration (FDA) to investigate alleged DNA contamination in Pfizer/BioNTech’s Comirnaty and Moderna/NIAID’s Spikevax mRNA COVID shots. Dr. Ladapo expressed concern that residual DNA fragments encapsulated in lipid nanoparticles—used to deliver the synthetic spike protein—could potentially integrate into human cells, raising cancer risks.

Similar warnings were echoed by Phillip Buckhaults, PhD, professor of cancer molecular genetics at the University of South Carolina, and Jessica Rose, PhD, an immunologist who has studied post-vaccine adverse event patterns.⁴

Although the South Korean study was peer-reviewed and published in a Springer Nature journal, one of the world’s most reputable scientific publishers, some medical professionals have dismissed the findings as “overblown,” reigniting public debate over the idea that COVID-19 shots may be contributing to a growing number of aggressive (“turbo”) cancers in recent years, particularly in people under 50 years of age.⁵

Source: https://thevaccinereaction.org/2025/11/higher-cancer-rates-found-after-receipt-of-covid-19-shots/