Oncologist testifies before Senate: COVID mRNA vaccines may trigger cancer relapses
Oncologist Dr. Angus Dalgleish observed six melanoma patients relapse within six weeks of receiving COVID-19 booster shots, prompting him to investigate a possible link between mRNA vaccines and cancer progression.
Dalgleish testified before a U.S. Senate subcommittee on June 3, 2026, urging removal of mRNA COVID vaccines from the market due to what he described as T-cell exhaustion and immune system changes.
The oncologist reported similar cancer progression patterns in colorectal, breast, prostate, blood cancers and gliomas, including younger patients with more aggressive disease and reduced treatment efficacy.
Critics including virologists and cancer experts told The BMJ there is no epidemiological evidence linking mRNA vaccines to increased cancer incidence, calling Dalgleish’s observations anecdotal.
Dalgleish wrote to The BMJ editor in 2022 calling for a halt to vaccine booster programs and open debate about cancer relapses, warning of what he called “active suppression” of scientific inquiry.
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