GH1 and pituitary gland adenoma: Eljamel et al. studied 30 patients with pituitary adenomas; non-functioning macroadenomas (n = 14), gonadotrophin macroadenomas (n = 5), GH-secreting macroadenoma (n = 1), prolactinomas (n = 2), ACTH secreting microadenomas (n = 3), GH-secreting microadenoma (n = 1), and pituitary cysts (n = 4).