By Nicolas Hulscher, MPH

South Korea study of 8.4 million adults finds higher risks of overall, lung, prostate, thyroid, gastric, colorectal, and breast cancers — across both mRNA and viral-vector platforms.

About a month ago, the first-ever population cohort study reported increased cancer risks following COVID-19 vaccination. In Italy, nearly 300,000 residents were tracked for 30 months, showing that mRNA shots significantly increased the risk of overall cancer, breast cancer, bladder cancer, and colorectal cancer.

BREAKING: First Population-Wide Study Finds COVID-19 “Vaccines” Increase Risk of Multiple Cancers Nicolas Hulscher, MPH · Aug 30 Read full story

Now, a second—and far larger—population-based cohort study by Kim et al from South Korea has corroborated and expanded upon those findings. Drawing on a massive sample of more than 8.4 million people, this is one of the most powerful cancer-safety datasets ever analyzed.

The results are striking. After accounting for age, sex, comorbidities, income level, and prior COVID-19 infection, COVID-19 vaccination was linked to significant increases in multiple major cancers, with the signal consistent across all vaccine platforms, both sexes, and age groups:

Study Design at a Glance

• Design & data: Population-based retrospective cohort using the Korean National Health Insurance database (2021–2023).
• Population: 8,407,849 adults.
• Exposure: COVID-19 vaccination (analyzed overall and by platform: mRNA, cDNA, and heterologous schedules).
• Matching: Large-scale propensity score matching (1:4 vaccinated:unvaccinated for the main analysis; 1:2 within vaccinated for booster vs non-booster).
• Modeling: Multivariable Cox proportional hazards models (adjusted for age, sex, comorbidity index, income level, and prior COVID-19 infection), estimating hazard ratios (HRs) with 95% confidence intervals (CIs); analyses stratified by sex and age.
• Outcome window: 1-year incidence of overall and site-specific cancers post-vaccination.

Key Results — Cancers with Significant Increases (1-year follow-up)

• Overall cancer: HR 1.27 (95% CI, 1.21–1.33) → 27% higher risk of all cancers combined in vaccinated vs. unvaccinated at 1 year.
• Lung cancer: HR 1.53 (95% CI, 1.25–1.87) → 53% higher risk
• Prostate cancer: HR 1.69 (1.35–2.11) → 69% higher risk
• Thyroid cancer: HR 1.35 (1.21–1.51) → 35% higher risk
• Gastric (stomach) cancer: HR 1.34 (1.13–1.58) → 34% higher risk
• Colorectal cancer: HR 1.28 (1.12–1.47) → 28% higher risk
• Breast cancer: HR 1.20 (1.07–1.34) → 20% higher risk

Interpretation: An HR of 1.53 for lung cancer means that vaccinated individuals developed lung cancer at a rate 53% higher than matched unvaccinated peers, over the same one-year follow-up period. Similar interpretations apply to each cancer type.

By Vaccine Platform

• cDNA vaccines (AstraZeneca type): linked to higher risks of thyroid, gastric, colorectal, lung, and prostate cancers.
  • Overall cancer HR 1.47 (95% CI 1.39–1.56) → 47% higher risk
• mRNA vaccines (Pfizer/Moderna): linked to higher risks of thyroid, colorectal, lung, and breast cancers.
  • Overall cancer HR 1.20 (95% CI 1.14–1.26) → 20% higher risk
• Heterologous (mixed schedules): linked to higher risks of thyroid and breast cancers.
  • Overall cancer HR 1.34 (95% CI 1.21–1.48) → 34% higher risk

Interpretation: The elevated cancer risks were not confined to one vaccine platform. Whether adenoviral-vector (cDNA), mRNA, or mixed schedules, each vaccine type was associated with a measurable increase in overall cancer — and each had specific cancer sites driving the signal. In other words, no vaccine technology was free of cancer risk in this dataset.

Booster-Dose Analysis

• Gastric cancer: HR 1.23 (p = 0.041) → 23% higher risk with boosters
• Pancreatic cancer: HR 2.25 (p < 0.001) → 125% higher risk with boosters

Interpretation: Booster doses were associated with notably higher risks of gastric and pancreatic cancers. For pancreatic cancer, the risk more than doubled in boosted individuals.

Overall Cancer Trends/Sex & Age Stratification

• Overall cancer: Incidence was higher in the vaccinated across every demographic group.
  • Women showed the highest relative burden, with 48.4 per 10,000 vaccinated vs. 38.2 per 10,000 unvaccinated at one year.
  • Elderly adults (≥75 years) carried the greatest absolute burden, at 119.9 per 10,000 vaccinated vs. 91.7 per 10,000 unvaccinated.
  • Younger adults (<65 years) also experienced a clear overall increase, despite lower baseline rates.
• Site-specific patterns:
  • Men: elevated risks for gastric and lung cancers
  • Women: elevated risks for thyroid and colorectal cancers
  • Under 65 years: stronger signals for thyroid and breast cancers
  • ≥75 years: markedly higher risk of prostate cancer

Interpretation: Both the overall and site-specific results show a consistent pattern — every demographic group experienced elevated cancer risks, though the type and absolute burden varied. Women and the elderly were hit hardest, but no population segment was spared.

Taken together, the evidence is now impossible to ignore. The only two population-level cohort studies ever conducted on COVID-19 vaccination and cancer — one in Italy and one in South Korea — have both found major increases in cancer risk. The Italian study (≈300,000 people, 30-month follow-up) identified significant elevations in overall cancer, breast, bladder, and colorectal cancers. The South Korean study (8.4 million people, 1-year follow-up) confirmed and expanded these findings, documenting increased risks of overall cancer plus six site-specific cancers (lung, prostate, thyroid, gastric, colorectal, and breast).

Critically, the signal was observed across all vaccine types — both mRNA and viral-vector (cDNA) shots — and in every demographic group analyzed. In plain terms: both major COVID-19 vaccine platforms appear to be carcinogenic

With two independent national datasets converging on the same conclusion, governments, regulators, clinicians, and researchers must confront a sobering reality: nearly 70% of the global population has been injected with a carcinogenic product. The evidence demands immediate market withdrawal of these products.

At the McCullough Foundation, we are deeply investigating both the molecular mechanisms and the population-level data linking COVID-19 vaccination to cancer. We are currently preparing several new studies to expand this critical line of evidence. This work requires substantial time, expertise, and resources, and we ask for your support in funding this urgent research: mcculloughfnd.org/products/donate-1

Nicolas Hulscher, MPH

Epidemiologist and Foundation Administrator, McCullough Foundation

Support our mission: mcculloughfnd.org

Please consider following both the McCullough Foundation and my personal account on X (formerly Twitter) for further content.

From LifeSiteNews

By Doug Mainwaring

“This extraordinary statement — essentially declaring the entire UN process illegitimate — represents a watershed moment in international relations. A U.S. Cabinet Secretary stood before the world body and rejected not just specific provisions but the fundamental premise that the UN has authority to impose health mandates on sovereign nations,”

Health and Human Services Secretary Robert F. Kennedy Jr. told the United Nations that the United States won’t support World Health Organization (WHO) policies that promote abortion and radical gender ideology.

Kennedy delivered a powerful message about the global chronic disease crisis, defended U.S. national sovereignty, and exposed the U.N.’s guileful attempt to manufacture consensus.

Speaking at a U.N. meeting on preventing and combating chronic illnesses, Kennedy said that the U.S. would reject a proposed U.N. declaration because it has overstepped its role.

RFK Jr. just walked into the UN and SHREDDED its “oppressive” declaration on non-communicable disease.

“The WHO cannot claim credibility or leadership until it undergoes radical reform.”

“The declaration is filled with controversy.”

Kennedy slammed “provisions about everything… pic.twitter.com/Dmbsj9GmLJ

— Holden Culotta (@Holden_Culotta) September 25, 2025

“I call on the international community to come together to combat this scourge. We cannot defeat the epidemic alone, but the U.N. approach is misdirected. It attempts both too little and too much,” said Kennedy.

The declaration “exceeds the UN’s proper role while ignoring the most pressing health issues,” said Kennedy. “That’s why the U.S. will reject it.”

“We cannot accept language that pushes destructive gender ideology,” explained the Trump administration’s top health official. “Neither can we accept claims of a constitutional or international right to abortion.”

“The WHO cannot claim credibility or leadership until it undergoes radical reform,” said RFK Jr., who described the U.N. declaration as “political” in nature.

“The declaration is filled with controversy, with provisions about everything from taxes to oppressive management by international bodies of communicable diseases,” said RFK Jr. “The US will walk away from the declaration, but we will never walk away from the world or our commitment to end chronic disease.”

“Member States decided earlier this year that this meeting should approve a declaration in advance by consensus to ensure this gathering would not be marred by controversy. But the declaration is filled with controversy,” he said. “The draft declaration for us today should not have been included in today’s agenda.”

“This extraordinary statement — essentially declaring the entire UN process illegitimate — represents a watershed moment in international relations. A U.S. Cabinet Secretary stood before the world body and rejected not just specific provisions but the fundamental premise that the UN has authority to impose health mandates on sovereign nations,” observed Douglas Sayer Ji in his Substack. 

“The implications extend far beyond health policy. Kennedy’s stand signals that America will no longer subordinate its Constitution, its democratic processes, or its citizens’ rights to unelected international bodies—regardless of the humanitarian language used to justify such subordination.”

In a separate video message released on social media, Kennedy was even more pointed in his remarks.

“A sound global policy must respect families, and cultures, and communities.  It must be practical, cost effective, and locally driven,” explained Kennedy.

“More specifically, we cannot accept language that pushes radical gender ideology. We believe in the biological reality of sex. Women deserve dignity, safety, and women-only spaces,” he argued.

“We cannot accept claims of a constitutional or international right to abortion. As President Trump has said, ‘global bureaucrats have absolutely no business attacking the sovereignty of nations that wish to protect innocent life,’” said Kennedy.

“We also can’t cede authority to the World Health Organization,” declared Kennedy. “The WHO’s failure during COVID cost the world valuable time and countless lives. Until the WHO undergoes meaningful reform, it cannot claim credibility or leadership.