
WASHINGTON-There is insufficient evidence to prove or disprove whether polio vaccine doses contaminated with simian virus-40 (SV40) between 1955 and 1963 can trigger certain cancers in humans, according to a report by the Institute of Medicine (IOM), a part of the National Academy of Sciences. Although most population studies have not found an increase in the cancers among people inoculated with the vaccine between 1955 and 1963, a possible link cannot be completely ruled out because of substantial statistical and design limitations in the 13 studies, an IOM committee concluded.
