Some researchers have found prostate cancer in a 2,200 year old mummy.
We have evidence of human cancer before that.
But the more important point is in regards to "industrial factors" as mentioned in the former article.
Cancer happens because genes are disrupted....it isn't just "industrial factors" which cause that....natural radiation does that, certain foods do that, etc. The same things which cause mutation which have given us speciation have given us cancer. They aren't necessarily "industrial factors".
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