[wissler]

If it has the capacity to produce one kind of cancer then it has the capacity to produce a kind of cancer that was not part of the study.

What is absurd and contemptible is an attitude that "if such and such medical intervention was not proven to cause harm, then we should act as if it does cause no harm", ignoring the fact that the law of unintended consequences trumps what medical science has not yet proven.

http://en.wikipedia.org/wiki/Thalidomide