Those dwarfs seem to get even less cancer than you would expect given the reduced number of cells.

Also, on a related note, there's Peto's Paradox about why cancer rates are similar across species despite vastly different sizes (mice, humans, whales).

http://blogs.discovermagazine.com/loom/2011/02/28/the-mere-e...

Paper behind paywall: http://www.sciencedirect.com/science/article/pii/S0169534711...