1-year risks of cancers associated with COVID-19 vaccination: a large population-based cohort study in South Korea, 2025, Kim et al.

Chandelier

Chandelier

Senior Member (Voting Rights)
biomarkerres.biomedcentral.com

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

The oncogenic potential of SARS-CoV-2 has been hypothetically proposed, but real-world data on COVID-19 infection and vaccination are insufficient. Therefore, this large-scale population-based retrospective study in Seoul, South Korea, aimed to estimate the cumulative incidences and subsequent...
biomarkerres.biomedcentral.com biomarkerres.biomedcentral.com

Authors:
Hong Jin Kim, Min-Ho Kim, Myeong Geun Choi & Eun Mi Chun


22 October 2025 Readers are alerted that concerns with this article have been raised with the Editors. Editorial action will be taken as appropriate once the concerns have been fully investigated.


Abstract​

The oncogenic potential of SARS-CoV-2 has been hypothetically proposed, but real-world data on COVID-19 infection and vaccination are insufficient.
Therefore, this large-scale population-based retrospective study in Seoul, South Korea, aimed to estimate the cumulative incidences and subsequent risks of overall cancers 1 year after COVID-19 vaccination.

Data from 8,407,849 individuals between 2021 and 2023 were obtained from the Korean National Health Insurance database.
The participants were categorized into two groups based on their COVID-19 vaccination status.
The risks for overall cancer were assessed using multivariable Cox proportional hazards models, and data were expressed as hazard ratios (HRs) and 95% confidence intervals (CIs).

The HRs of thyroid (HR, 1.351; 95% CI, 1.206–1.514), gastric (HR, 1.335; 95% CI, 1.130–1.576), colorectal (HR, 1.283; 95% CI, 1.122–1.468), lung (HR, 1.533; 95% CI, 1.254–1.874), breast (HR, 1.197; 95% CI, 1.069–1.340), and prostate (HR, 1.687; 95% CI, 1.348–2.111) cancers significantly increased at 1 year post-vaccination.

In terms of vaccine type, cDNA vaccines were associated with the increased risks of thyroid, gastric, colorectal, lung, and prostate cancers; mRNA vaccines were linked to the increased risks of thyroid, colorectal, lung, and breast cancers; and heterologous vaccination was related to the increased risks of thyroid and breast cancers.

Given the observed associations between COVID-19 vaccination and cancer incidence by age, sex, and vaccine type, further research is needed to determine whether specific vaccination strategies may be optimal for populations in need of COVID-19 vaccination.
 
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www.fpoe.at

Dramatische Zunahme von Krebserkrankungen nach COVID-19-Impfungen

Südkoreanische Studie mit mehr als acht Millionen Teilnehmern zeigt alarmierenden Anstieg von Krebsfällen nach COVID-19-Impfungen.
www.fpoe.at www.fpoe.at

This study seems to be instrumentalized for political reasons, so I thought I post it even if it is already marked as flawed.

AI translation:

Dramatic Increase in Cancer Cases After COVID-19 Vaccinations​

Freedom Party MEP Gerald Hauser. © Photo: FPÖ
South Korean study with more than eight million participants shows alarming rise in cancer cases following COVID-19 vaccinations.

03 November 2025

Categories: COVID-19 review, European Union, Health

“Rising cancer cases are repeatedly being discussed in the European Parliament. I recently spoke in the plenary session about the increasing number of breast cancer cases among women,” explained Freedom Party MEP Gerald Hauser. “I have repeatedly pointed out in my books, lectures, and speeches in Parliament the massive side effects of the vaccinations. For years, this was rejected, covered up, and denied. But now that is no longer possible,” emphasized the Freedom Party representative, adding: “It is now proven that the genetic mRNA COVID-19 vaccines can damage the immune system and cause cancer.”

Increasingly Affecting Young People​

“A recent study confirms the already known data and casts a shocking light on the COVID-19 vaccinations,” said Hauser. “More and more doctors in Europe are reporting a significant increase in cancer cases, with young people increasingly affected and the cancers becoming more aggressive. In South Korea, one of the largest cohort studies ever conducted was published. A total of 8,407,849 South Koreans were divided into two groups: vaccinated and unvaccinated. The significance of this study is therefore very high.”

Parliamentary Inquiry to the EU Commission​

The MEP summarized the results: “Within just one year, there was a statistically significant increase in cancer cases among the vaccinated—especially in thyroid cancer (+35 percent), stomach cancer (+33.5 percent), colon cancer (+28 percent), lung cancer (+53 percent), breast cancer (+20 percent), and prostate cancer (+69 percent). I will submit a parliamentary inquiry to the EU Commission and want to know how cancer rates in Europe have developed since the introduction of the COVID-19 vaccinations. And I want to know whether the EU Commission will now introduce special screening programs for the vaccinated—because they represent a high-risk group,” said Hauser.
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funny how the FPÖ has been at best silent or at worst straight up denialist and awful about long COVID and ME/CFS. Yet they make so much noise about this.

Shows that they don’t actually care about anyone. Sick people just pawns in their political games, where they’ll cherrypick evidence to support their narrative instead of basing their narrative on the evidence.

(Not that other political parties are innocent here either, just the FPÖ seems particularly egregious.)
 
It looks like they only adjusted for age and sex in addition to vaccine type. Assuming that data is valid, could this correlation not just be because people that are at a higher risk of cancer also have a higher chance of being in the groups that got vaccinated?
 
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weltwoche.ch

Studie: Dramatische Zunahme von Krebs nach Covid-19-Impfungen. Jetzt muss auch die EU-Kommission Stellung nehmen

Es ist eine der grössten je durchgeführten Kohortenstudien über die krebsauslösende Wirkung von Covid-19-Impfstoffen: In Südkorea wurden die Daten von über acht Millionen Teilnehmern untersucht. Die Autoren schreiben dazu, bisher sei das «onkogene Potenzial von SARS-CoV-2» hypothetisch...
weltwoche.ch weltwoche.ch

Swiss right-wing journal Die Weltwoche is reporting about it, too:
Study: Dramatic Increase in Cancer After COVID-19 Vaccinations — Now the EU Commission Must Also Respond

Philipp Gut

It is one of the largest cohort studies ever conducted on the cancer-causing potential of COVID-19 vaccines: in South Korea, data from more than eight million participants were analyzed.

The authors write that, until now, the “oncogenic potential of SARS-CoV-2” had only been suggested hypothetically, but that real-world data had been insufficient. This has now changed with this “large-scale population-based retrospective study,” which estimates “the cumulative incidences and subsequent risks of cancer overall one year after COVID-19 vaccination.”

The data from 8,407,849 individuals between 2021 and 2023 come from the Korean national health insurance system. Participants were divided into two groups based on their vaccination status. The vaccinated showed a “significantly increased” risk for various types of cancer.

The figures in detail: prostate cancer up 69 percent, lung cancer up 53 percent, thyroid cancer up 35 percent, stomach cancer up 33.5 percent, colon cancer up 28 percent, breast cancer up 20 percent. For DNA vaccines, the cancer risk was especially elevated for thyroid, stomach, colon, and prostate cancers. For mRNA vaccines, this applied to thyroid, colon, lung, and breast cancers. The COVID-19 vaccine thus appears to act as a veritable booster for cancer.

Now, the European Commission must also take a position on the matter. Austrian Member of Parliament Gerald Hauser wants to know what the corresponding figures look like in Europe, how the Commission explains these “alarming increases in such a short time,” and whether special cancer screening programs are planned or recommended for those vaccinated against COVID-19 as a “high-risk group for cancer.”
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