| A very rare form of multiple endocrine neoplasia, an inherited cancer syndrome, with parathyroid and anterior pituitary tumors, possibly associated with adrenal, renal, and reproductive organ tumors. Caused by heterozygous inactivating mutations in the CDKN1B gene (12p13.1-p12) encoding p27, a cyclin-dependent kinase inhibitor that acts as a negative regulator of cell cycle progression. Most cases are the result of autosomal dominant inheritance. Some cases of sporadic de novo occurrence are however reported. |
