RET and medullary thyroid gland carcinoma: However, the role of RET Y791F-only in MTC/MEN2-related pathogenesis and susceptibility is currently a matter of dispute (Vestergaard et al. 2007, Kloos et al. 2009, Eng 2010, Erlic et al. 2010, Rich et al. 2014 and Supplementary References, see section on supplementary data given at the end of this article).