More or Less No, a study has not shown that the covid jab causes cancer
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Jan 17, 2026 
In this discussion, Professor Justin Fendos, an expert in cancer and biophysics, debunks a controversial South Korean study that claims a 27% increase in cancer risk from COVID vaccinations. He explains the study's limitations, including inadequate peer review and the omission of key variables like genetics and lifestyle factors. Fendos emphasizes that the timeline of cancer diagnosis is too short to link it to the vaccine and notes that high vaccination rates in South Korea contradict the study's findings, ultimately concluding there's no evidence of a causal connection.
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Publication Format Matters
- The paper's classification as correspondence means it may not have had full peer review and should be treated cautiously.
- Justin Fendos says the study does not convincingly show COVID vaccination causes cancer.
Key Risk Factors Were Omitted
- The researchers limited their analysis to seven variable types despite the database containing much more information.
- Omitting key risk factors like genetics or smoking undermines causal claims about vaccination and cancer.
Screening Drives Apparent Increases
- Health-seeking behaviour likely confounds the association because proactive people both vaccinate and get screened more.
- Justin Fendos warns that increased screening can create apparent rises in diagnoses among the vaccinated.