OK. Strap yourselves in. This is a roller-coaster of confounding factors.
Michael D. Shaw on Junkscience.com writes on statins… over-prescribed and over-hyped.
In this case the substantial confounding factor is that high cholesterol is protective against cancer. Those most likely to be prescribed statins are, if the statins have little effect (as they often do/don't) then the patients are already more resistant to cancer.