GPR101 and pituitary gland adenoma: Acromegaly can be a part of a syndromic disease appearing concomitantly with other endocrine tumors, such as in MEN1, MEN4, Carney complex, McCune-Albright and SDHx-related pituitary adenomas or being a part of familiar isolated pituitary adenoma (FIPA) in aryl hydrocarbon receptor interacting protein (AIP) or GPR101 (G-protein coupled receptor 101) mutation positive and negative cases (2, 3).