evidence: Various experts also told us that it is unlikely that residual DNA in the vaccines could integrate into DNA or cause cancer, even in theory. And as we have previously written, there isn’t evidence to date that the vaccines cause cancer or have led to an increase in cancer. [...] The FDA scientists went on to state that they consider the primary cancer-related concern with DNA in vaccines to be the introduction of an activated version of a cancer-causing gene to a cell — not just any DNA integrating into the genome at the wrong place. [...] As we’ve said, social media posts misleadingly refer to the presence of "SV40, a cancer causing sequence." This brings to mind past concerns, which were not borne out, that contamination of polio vaccines with the entire SV40 virus could cause cancer. Researchers discovered in 1960 that monkey kidney cells that had been used to produce some polio vaccines were contaminated with SV40, which was found to cause cancer in rodents. But the virus has not been shown to cause cancer in humans, and the contamination did not ultimately lead to more cancer in children who received the contaminated vaccines compared with those who didn’t.