I'm lucky enough that I am still relatively young (33) and that my family has almost know history of cancer. My one grandfather had it twice, beat it twice and live until 93.
However working in the medical field and now that my parents are in their 60s its something I worry about much more than I used to.
I've taken enough ECMC or BGH transfers to Roswell when they go in for "Flu Like Symptoms" and have a white blood cell count that is through the roof.