GJB2 and ACTH-producing pituitary gland adenoma: The expression of Cx26 was found in 43 of the 60 (72%) pituitary adenomas samples: 20 of the 31 (65%) NF-PitNETs, 16 of the 20 (80%) somatotropinomas, and 7 of the 9 (78%) corticotropinomas.