Tumour found in 255mn-yr-old fossil of sabre-toothed beast
Washington-based scientists have found one of the oldest known tumours, in the fossil of a sabre-toothed, mammal-like beast that lived 255 million years ago. Composed of tiny tooth-like structures, the benign tumour was found embedded beside the root of the creature's enlarged canine tooth. The animal belonged to an extinct group of carnivores that mixed mammal-like and reptile-like traits.