I may have been a little vague in my previous, but the 23.5% relates to the general population. The only long term study of which I'm aware, that has looked at pilot mortality showed a ~24% cancer rate but a much increased risk of melanoma and a particular type of leukemia.
It was a fairly sizeable study investigation ~10,000 pilots. However, given that pilots are generally helathier than the average Joe, the cancer rate could be expected to be lower, particularly, with our regular medicals. Swings and roundabouts? Who knows?
(Edited because I can't type!)