About the only thing the Daily Mail haven't claimed causes cancer is... reading the daily mail. 
I'm no doctor but I suspect a lot of it has to do with life expectancy. I doubt many ancient Egyptians lived far into their 40's. Very few people suffer from cancer below this age so should we necessarily be surprised that there is little evidence of mummies dying of cancer?
The longer you life the more cells reproduce and mutate and the higher the chances are of mutations causing uncontrolled cell growth.
Yes, a third of us will suffer from cancer, but I suspect in many of those people it will strike in old age around their natural end of life anyway. It's simply one of the limiting factors in how long the human body can survive. We have eliminated so many other causes of mortality that we are starting to see its' significance.
Yes, excesses of modern life have something to play in people contracting cancer relatively early in life, I'm sure, but I bet that doesn't account for that many of the third of us who will get it. Just my gut feeling.
Kevin
Fully agree with this too. I also think it is natures way of killing us off. What purpose would it serve to live on? Ones selfishness?
We need to die to allow the race to move on.
another alternative thinking would be why populate like rabbits..

seriously its not the natures way to kill us.. an enzyme stops cell reproduction.. lack of it ends with cancer even without external factors.. like all living organisms human dna also mutates .. and probably will correct itself after some thousand years or more ..
but probably we wont see ..
ps : I also think that living a very long bad life not something desirable.. however human kind looses a high knowledge power when we die with many knowledge after long years of hard work..