Is it just because we are living longer? If that were true, children would not have it. I am not a scientist but I am a cancer patient, and I have thought about this for a long time.
Two major causes - pollution, chemicals in our environment, hormones in our food - and radiation.
The last few decades have permeated our environment with radiation from all manner of gadgets. We are being radiated to death without ever seeing a Martian or a flying saucer.
From the time a child can sit in a chair, he is put in front of a computer and zapped. At school he is surrounded by computers. At work he is surrounded by computers. And cell phone towers shed radiation over our homes and streets and parks and schools.
We can't see or taste or hear radiation, so we pretend it isn't zapping through our bodies day and night But, be sure, those who know it is true will never admit it because money is valued above life itself.
And who would give up their computer to save their child's life?.