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Recent research (Kozlov, 2025) indicates that while COVID-19 vaccination does not prevent cancer, the mRNA vaccines may enhance the effectiveness of specific cancer immunotherapies in patients who are already undergoing treatment.
Current Understanding
- No Preventative Effect: There is no evidence that COVID-19 vaccines prevent the development of cancer or cause it to recur.
- Enhanced Immunotherapy Response: Several studies, including retrospective analyses of patient data and preclinical animal studies, suggest that receiving an mRNA COVID-19 vaccine (Pfizer or Moderna) can significantly improve outcomes for patients with certain advanced cancers (specifically lung cancer and melanoma) who are also receiving immune checkpoint inhibitors (ICIs).
- Mechanism: The vaccines appear to act as an ‘alarm,’ triggering a robust, non-specific immune response that makes cancer cells more visible and susceptible to attack by the immune system and the ICI drugs. This effect was most pronounced in “immunologically cold” tumours, which typically do not respond well to standard immunotherapy.
Improved Survival Rates (Observed): In one large observational study, lung cancer patients receiving an mRNA vaccine around the time of starting immunotherapy saw their median survival time nearly double (from about 21 months to 37 months) compared to unvaccinated patients.
Important Considerations and Next Steps
Association vs. Causation: The findings described above are from observational studies, which can show an association but cannot definitively prove that the vaccine caused the improved survival. To confirm these findings, researchers are planning multi-centre, randomised Phase III clinical trials.
Safety for Cancer Patients: Public health experts and cancer specialists continue to recommend that people with cancer receive all recommended COVID-19 vaccinations and boosters. The benefits of protection against severe COVID-19 outcomes far outweigh any potential risks.
