[nonbel]

>"the observed relationship would be explained if a cancer cell was the end-result of seven successive mutations."

http://www.nature.com/bjc/journal/v91/n12/pdf/6602297a.pdf

That is clearly a process, not like the example of Muons and Kaons proposed to be similar (ie "A is correlated with B").

Of course, the next step is to figure out htf this process works.