evidence: In a December 6 letter, Ladapo said he believed the drug delivery system used by mRNA vaccines could be an "efficient vehicle for delivering contaminant DNA into human cells." He said that because DNA integration could theoretically affect oncogenes—the genes that have the ability to "transform a healthy cell into a cancerous cell"—that DNA contaminant could cause cancer in vaccine recipients. [...] "In general, with regard to the mRNA vaccines, while concerns have been raised previously as theoretical issues, available scientific evidence supports the conclusion that the minute amounts of residual DNA do not cause cancer or changes to a person's genetic code," the FDA said. Paul Offit, an internationally recognized infectious disease expert and the director of the Children's Hospital of Philadelphia's Vaccine Education Center, told Newsweek that although there can be trace levels of fragmented DNA from COVID vaccines, Ladapo's suggestion that it could cause cancer is "fanciful."