[nonbel]

Just as one example of a commonality, aneuploidy is reported for nearly all cancers: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2917070/

That is clearly something that can be targeted in principle (and not the only thing). Whether the "causes" are different is irrelevant. Whether the treatments are different is a choice made by people, and also irrelevant.