Mutations in the RET proto-oncogene are associated with MEN2a and FMTC. - Donis-Keller,H.; Dou,S.; Chi,D.; Carlson,K.M.; Toshima,K.; Lairymore,T.C.; Howe,J.R.; Moley,J.F.; Goodfellow,P.J.; Wells,S.A. (Hum Mol Genet, 1993)