Schiffman and Lynch’s teams have now independently revealed their findings — Schiffman's in the Journal of the American Medical Association1, and Lynch's in a paper2 posted to the bioRxiv.org preprint site, but which is in review at the journal eLife.
Using zoo autopsy records for 36 mammals — from striped grass mice to elephants — Schiffman’s team recorded no relationship between body size and cancer rate. (Around 3% of elephants get cancer, according to the team’s analysis of hundreds of captive-elephant deaths).