If you live long enough you will eventually get some kind of cancer. This is inevitable as DNA damage accumulates. Chances are something else will kill you first, but detailed autopsies of older people frequently turn up small, slow-growing cancer tumors.
It's why at a certain age with Prostate cancer "watchful waiting" is often preferable to invasive procedures. In some cases it will be so slow growing you're likely to die of something else first.
