Divina,
As far as I know, Carc hasn't been fully proven yet. Foubister did some initial observations of pregnant patients way way back, but that's as far as it got according to my sources.
Are you saying someone has carried out a full proving on it recently?
If so - when - whom (which cancer?)??!! I'd like to know.

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"The significance of a fact is measured by the capacity of the observer."
Carroll Dunham