At the 4th Congress of Neuroendoscopic Techniques in Paris, France, Chanson, a French endocrinologist, used the return of normal hormone levels after surgery as a criterion for the cure of pituitary tumors and evaluated the efficacy of microsurgical removal of pituitary tumors. adenomas or invasive giant adenomas, hormonal cure rates (equivalent to cure rates) after microsurgery: Prolactin adenomas 25-35% Growth hormone adenomas 25-55% Adenomas 25-55% It is evident that only about 1/3 to 1/2 of patients with pituitary tumors over 1 cm in diameter are cured after surgery using microsurgery transsphenoidal surgery, and the remaining patients require continued treatment, including drugs, radiation therapy, and surgery.