Northern blotting revealed that FKBP2 is expressed in tissues that are predisposed to hyperplasia in multiple endocrine neoplasia type 1 (MEN1) patients; however, mutation analysis of MEN1 kindreds and sporadic tumors excluded FKBP2 as a candidate gene for MEN1 [26]. This evidence concerns the gene FKBP2 and multiple endocrine neoplasia type 1.