Abstract:Objective To analyze the risk factors of recurrence of functional pituitary adenomas (FPAs) after transsphenoidal microsurgery, and to establish a functional model for judging the risk of recurrence of FPAs. Methods Retrospective analysis of 112 cases of FPAs undergoing transsphenoidal microsurgery admitted to the First Affiliated Hospital of Xian Jiaotong University and the Second Affiliated Hospital of Xi’an Jiaotong University from October 2010 to October 2017, and hospital outpatient medical record system and telephone call back were used to collect postoperative follow-up. The outcomes of patients were divided into recurrent group (18 cases) and non-recurrence group (94 cases). Univariate analysis and Cox regression analysis were used to determine the risk factors associated with postoperative recurrence of FPAs. Results There was no significant difference in gender, age and whether the first operation between two groups (P > 0.05). Non-recurrence group were significantly different with the postoperative recurrence group in the tumor type, Knosp classification, tumor diameter, postoperative residual tumor, Ki-67 expression and adjuvant treatment (P < 0.05). After multivariate Cox regression analysis, tumor diameter [Rl ^ R=3.120 (95% CI: 1.248, 7.798), P = 0.015], postoperative tumor residual [Rl ^ R=3.246 (95% CI: 1.289, 8.178), P = 0.012], and Ki-67 expression [Rl ^ R=1.151 (95% CI: 0.826, 4.871), P = 0.034] were found to be independent risk factors for postoperative recurrence of FPAs. Conclusions Large tumor diameter, postoperative tumor residual, and Ki-67 ≥3% are high risk factors for postoperative recurrence of FPAs. Early identification of patients with high-risk recurrence and early implementation of response measures can improve patient outcomes.