Can-cer-tainly Say I'm Glad I Didn't 💉💉

The Korean Study No One Wants You to Read Closely

A large, population-wide signal that cancer risk jumped in the first year after COVID-19 vaccination

On 26 September 2025, the journal Biomarker Research published a short correspondence that should have made front-page news everywhere. It didn’t.

Title:
“1-year risks of cancers associated with COVID-19 vaccination: a large population-based cohort study in South Korea”

Kim HJ, Kim M-H, Choi MG, Chun EM. Biomarker Research 2025;13:114

https://doi.org/10.1186/s40364-025-00831-w

What they did

The researchers took the entire adult population of Seoul (8,407,849 people) from the Korean National Health Insurance database, followed everyone from 2021–2023, and simply asked:

“How many new cancers were diagnosed in the 12 months after a person received a COVID-19 vaccine compared to those who remained unvaccinated?”

They used the standard statistical toolkit (propensity-score matching, multivariable Cox models) to balance the groups for age, sex, income, comorbidities, and prior healthcare use.

What they found (selected hazard ratios, all statistically significant):

Cancer site

Cancer site	Hazard Ratio (95% CI)	Approximate increased risk
Thyroid	1.351 (1.206–1.514)	+35%
Gastric	1.335 (1.130–1.576)	+34%
Colorectal	1.283 (1.122–1.468)	+28%
Lung	1.533 (1.254–1.874)	+53%
Breast	1.197 (1.069–1.340)	+20%
Prostate	1.687 (1.348–2.111)	+69%
All cancers combined	~1.27	+27%

When broken down by vaccine platform: mRNA vaccines (Pfizer/Moderna) were specifically linked to the increased risk of thyroid, colorectal, lung, and breast cancers.

Viral-vector vaccines were linked to thyroid, gastric, colorectal, lung, and prostate.

Mixed schedules carried risk for thyroid and breast.

These are not tiny signals hidden in the noise. These are large, clean, government-held insurance records covering virtually an entire modern city of 10 million people.

The authors are cautious in their wording (“association,” “further research needed”), but the way scientists must be. But the numbers speak plainly: in the first year after the shots were given, certain cancers appeared at rates far higher than in the unvaccinated.

Many of us have watched this play out in real life. A relative or friend in remission, doing great, gets the shots “to be safe,” and within months the cancer is back—aggressive, multi-focal, unstoppable. Doctors call it “unfortunate timing.” The Korean data suggest it was not unfortunate, and it was not rare.

The journal issued an “Expression of Concern” weeks later, the usual ritual when a finding is politically explosive. That does not invalidate the underlying database or the math. It simply reminds us whose interests are threatened by the result.

This study is not the only one heading in this direction (Japanese, Czech, and U.S. insurance datasets have started whispering the same pattern), but it is by far the largest and cleanest to date.

You will be told this is “just correlation” or “better screening in vaccinated people.” Those explanations fall apart when you notice the unvaccinated control group was also getting regular healthcare in the same system, and the excesses are largest for cancers (lung, colorectal, prostate) that are not heavily driven by screening changes in a single year.

Sometimes the simplest reading is the correct one: millions of people received a novel injection that forces their cells to produce a foreign spike protein for an uncertain length of time, and in the months that followed, serious cancers appeared at elevated rates.

The Korean data are now part of the permanent scientific record. They cannot be waved away. They demand answers, not deflections.

Link to the full paper (open access):

https://biomarkerres.biomedcentral.com/articles/10.1186/s40364-025-00831-w

Read it yourself. Share it. The people we lost deserve at least that much honesty.