Indeed.
However, to be serious and philosophical, cancer has also been with us for ever, and it's probable that environmental factors - such as what we eat, drink. touch and breathe (or are otherwise exposed to, like sunlight) have got an awful lot to do with it. However, I wonder if 'they' have considered what would happen if (as is not impossible) we managed, 'overnight', to find ways to either prevent or cure all cancer (and, even worse, also prevent/cure all heart disease and strokes) - it would presumably cause a sociological and economic catastrophe of unimaginable proportions!
Kind Regards, John