It may not always exist, but what it would take to drive it out of our species would be no less than either incredibly sophisticated (not to mention ongoing) ge

It may not always exist, but what it would take to drive it out of our species would be no less than either incredibly sophisticated (not to mention ongoing) genetic engineering, very good nanotech that can intelligently monitor and control the process of division, or I suppose something like the "AutoDoc" from Larry Niven's 'Known Space' works. It's all very much science fiction now, but "always" is a long time. Still, I would place bets on our civilization taking it on the chin before we beat cancer entirely.