The CDC has quickly removed a page from their website, which WAS cached here (since removed by google so you can view an image of the cache here), admitting that more than 98 million Americans received one or more doses of polio vaccine within an 8-year span from 1955-1963 when a proportion of the vaccine was contaminated with a cancer causing polyomavirus called SV40. It has been estimated that 10-30 million Americans could have received an SV40 contaminated dose of the vaccine.

Here is a link to the cached CDC page

http://preventdisease.com/images13/CDC_Polio.png

Michele Carbone, Assistant Professor of Pathology at Loyola University in Chicago, has recently isolated fragments of the SV-40 virus in human bone cancers and in a lethal form of lung cancer called mesothelioma. He found SV-40 in 33% of the osteosarcoma bone cancers studied, in 40% of other bone cancers, and in 60% of the mesotheliomas lung cancers, writes Geraldo Fuentes.