Part of the problem with "cancer" is the loose defintions that are sometimes applied to it.
You need aberrant cell signaling and usually in human cells a 3 punch combination of problems to make a malignancy happen. Tumour suppressor proteins and genes are easier to mess with to help in induction of a cancer while mutating a proto-oncogene usually requires a much more specific mutation.
Furthermore, insofar as deciding what is going to cause cancer, they know very little to be absolutely true when it comes to cancer and what causes it. Eat healthy, try not to get fat, stay away from smoke and burned food, power lines, fuck you know even bananas can be carcinogenic.
Live and have fun. Try to stay healthy. If you get cancer, try to take care of it, that is about all you can do.
If anyone wants a great book about Cancer Biochem, PM me and I can let you on to a doozy. Really informative, although sometimes heavy. If you read it though, you will be miles ahead of other people in understanding this cellular condition they call cancer