PTC is a novel rearranged form of the ret proto-oncogene and is frequently detected in vivo in human thyroid papillary carcinomas. - Grieco,M.; Santoro,M.; Berlingieri,M.; Melillo,R.M.; Donghi,R.; Bongarzone,I.; Pierotti,M.A.; Della-Port,G.; Fusco,A.; Vecchio,G. (Cell, 1990)