R. Hofstra a.o.: A mutation in the RET proto-oncogene associated with multiple endocrine neoplasia type 2B and sporadic medullary thyroid carcinoma. Nature 367 (1994), 375-... S. Jhiang/E. Mazzaferri: The ret/PCT oncogene in papillary thyroid carcinoma. J. Lab. Clin. Med. 123 (1994), 331-... 8844 ZZ. Schilddru''sen-ca. Internet, Univ. Freiburg i. Br. 1996, ca. 15p.