I am convinced that cancer was invented by the devil.
I'm afraid, it is just the reverse. Cancer is the price modern civilization has had to pay, from eating of the Tree of Knowledge.
The more we seek to understand the world around us, and apply that knowledge, the more we suffer from those side affects. Whether it is from chemicals we use, GMO's, E.L.F.'s and E.M.F.'s, or heavy reliance on pharmaceuticals, and their unintended cross reaction with each other, and with other technologies we have come to rely on in manipulating our environment, these are all costs we have now come to bear, in the modern world.
Cancer rates are increasing, in an arithmetic progression, as new technologies get introduced, every year.
If you look at rare secluded tribal populations in the Amazon, or groups that shun most modern medicine and modern conveniences like the Amish? Their occurrences of cancer, are startlingly low compared to most other modern populations.