evidence: To date, more than 270 million people in the U.S. have received at least one dose of COVID-19 vaccine. Incidental cases of illnesses, including cancer, occurred even before COVID-19 vaccines existed. Therefore, in order to determine if vaccination raises the risk of illness, it isn’t enough to simply point to cases occurring after vaccination as evidence. One must compare the incidence of the illness following vaccination with the baseline incidence. There’s no evidence indicating that COVID-19 vaccines raise the risk of developing cancer or that they worsen cancer.