The risk of cancer increases with every cell division. As such, you would expect long-lived species like elephants to get cancer more often than short-lived species like mice. In 1975, however, Richard Peto discovered that this is not the case, and that there is very little variation in lifetime-cancer risk between animal species. This is known as Peto's paradox.
That was exactly my thought when I first saw the thread title. “I wonder if it has something to do with dots.”
And yup, I saw your reply and then checked out the images. Sure enough. Dots.