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takyon [soylentnews.org] writes:

Scientists have found evidence of a tumor [washington.edu] in a 255-million-year-old synapsid [wikipedia.org] fossil:

When paleontologists at the University of Washington cut into the fossilized jaw of a distant mammal relative, they got more than they bargained for — more teeth, to be specific. As they report in a letter [jamanetwork.com] [open, DOI: 10.1001/jamaoncol.2016.5417] [DX [doi.org]] published Dec. 8 in the Journal of the American Medical Association Oncology [jamanetwork.com], the team discovered evidence that the extinct species harbored a benign tumor made up of miniature, tooth-like structures. Known as a compound odontoma [wikipedia.org], this type of tumor is common to mammals today. But this animal lived 255 million years ago, before mammals even existed.

"We think this is by far the oldest known instance of a compound odontoma," said senior author Christian Sidor [washington.edu], a UW professor of biology and curator of vertebrate paleontology at the Burke Museum of Natural History and Culture [burkemuseum.org]. "It would indicate that this is an ancient type of tumor." Before this discovery, the earliest known evidence of odontomas came from Ice Age-era fossils.

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