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Cancer and CV-19 Vaccines

By October 7, 2025Commentary4 min read

Another study has been seized upon by the vax safety nuts to support claims that CV-19 vax cause cancer.  The study comes from South Korea, and I will just say upfront that it is a methodologic embarrassment.  It was an “observational” study with a mere one-year follow-up post vaccination.  Let us all just acknowledge that it is extremely rare for anything to cause a cancer in a one-year lag.  Think about smoking, which typically takes many years to prompt lung cancers.  In any event, the researchers looked at thyroid, lung, breast, prostate, colorectal and gastric cancers.  They claimed that vaccination was associated with increases in some of these cancers.  They also made the unsupported claim that CV-19 is itself associated with cancers, so by that logic, the vaccines could be linked to cancer.

We have already discussed recently the danger of that word “associated”; there are literally millions of factors or variables that could be attached to any event.  If you don’t account for all of those that might have some plausible intervening effect that is the actual cause, you are making a big mistake.  These authors made a big, big mistake.  The width of the confidence intervals for the supposed association is the first tipoff that something is wrong, when they are as large as here, something weird is going on.  They compared people who got boosters with those who didn’t, apparently so few people were not vaxed in South Korea that there was no analysis of that group.

In fact the only factors considered were sex and age, they apparently didn’t even look at CV-19 infection history, which is bizarre considering their rationale that CV-19 was itself associated with cancer.  Clearly there are many differences between people who did and didn’t get a booster, including a likelihood that many, fi not most vaxed persons also got infected and those who were infected likely decided not to bother with a booster, especially once the research started showing that getting infected was more protective from a subsequent infection that being vaxed.

Health seeking behaviors likely differ between the two groups as well, meaning that those getting boosters were probably more likely to seek cancer screenings or have regular physician visits.  Most of the cancers studied have regular screening recommendations.  People who show up for vaccination may have had other health issues discussed at the same time.  Family history of cancer should be considered given the heavy genetic involvement in cancer risk.  None of that was explored in this analysis.  The article was a “letter” with no peer review.  The authors are not oncologists or epidemiologists, they are orthopedic and pulmonary doctors.  While the researchers claimed to find a cancer link, there was no overall increase in cancer incidence in South Korea.  How can you have this supposed huge new cause of cancer, but there is no increase in incidence?  In other words, this study is complete bullshit and I assume will shortly be retracted.    (BR Article)

And here is an article by a researcher who in a more thorough manner makes many of the points I have made.  So don’t take my word on what a piece of garbage this is.  (SBM Article)

But for those of you who don’t like CV-19 vaccines, here, consistent with my long-running commentary and data analysis, is yet another study showing just how ineffective those vaccines were.  The bivalent versions of the vaccine were found to be ineffective against the later epidemic period variants of CV-19.  Really, completely ineffective.  (SSRN Study)

Kevin Roche

Author Kevin Roche

The Healthy Skeptic is a website about the health care system, and is written by Kevin Roche, who has many years of experience working in the health industry through Roche Consulting, LLC. Mr. Roche is available to assist health care companies through consulting arrangements and may be reached at khroche@healthy-skeptic.com.

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Join the discussion 3 Comments

  • Larry says:

    I’m not a “vaccine safety nut”, but I am a “vaccine effectiveness nut.” I’m confused by your consistent defense of CV vaccine safety, including mRNA types, but also dismissive of their effectiveness. Even if we dismiss the connection of vaccines with autism, don’t we need regular review of vaccine safety and effectiveness? And, when and what types vaccines should be given to newborns and children? BTW: the link to the SSRN study didn’t work.

    • Kevin Roche says:

      a drug or vaccine can be safe but not effective. CV-19 vax effectiveness looks similar to that of flu and other respiratory virus vax. It is hard because those viruses mutate frequently and are just so prevalent in such huge numbers that designing a really effective vax, like we have for measles is very difficult. The FDA has ongoing monitoring of the safety of all approved drugs and vaccines; there are several programs in place to do this, the best are contracts with large health plans and EHR providers. thanks for the heads up on the study link.

    • Kevin Roche says:

      I checked and the link worked just fine for me, try again

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