evidence: Claim linking Pfizer COVID-19 vaccine, cancer in mouse distorts study | Fact check [...] "SHOCKING: New Study proves Pfizer mRNA induced turbo cancer," the post reads. [...] There is no evidence that COVID-19 vaccines cause cancer. The post distorts a case report focused on a mouse that died of lymphoma after it was given a second dose of the Pfizer COVID-19 vaccine during a study. The report did not claim the two events were causally linked and its author called the Instagram post "a complete misinterpretation" of the researchers' work.