RT Journal Article T1 Predictors of Tumour Growth and Autonomous Cortisol Secretion Development during Follow-Up in Non-Functioning Adrenal Incidentalomas A1 Araujo-Castro, Marta A1 Parra Ramirez, Paola A1 Robles Lazaro, Cristina A1 Garcia Centeno, Rogelio A1 Gracia Gimeno, Paola A1 Fernandez-Ladreda, Mariana Tome A1 Sampedro Nunez, Miguel Antonio A1 Marazuela, Monica A1 Escobar-Morreale, Hector F. A1 Valderrabano, Pablo K1 adrenal incidentalomas K1 autonomous cortisol secretion K1 non-functioning adrenal incidentalomas K1 dexamethasone suppression test K1 Cardiovascular outcomes K1 European-society K1 Endocrinology K1 Management K1 Risk K1 Association K1 Guidelines AB Purpose: To assess the risk of developing autonomous cortisol secretion (ACS) and tumour growth in non-functioning adrenal incidentalomas (NFAIs). Methods: Multicentre retrospective observational study of patients with NFAIs. ACS was defined as serum cortisol >1.8 mu g/dL after 1 mg-dexamethasone suppression test (DST) without specific data on Cushing's syndrome. Tumour growth was defined as an increase in maximum tumour diameter >20% from baseline; and of at least 5 mm. Results: Of 654 subjects with NFAIs included in the study, both tumour diameter and DST were re-evaluated during a follow-up longer than 12 months in 305 patients. After a median follow-up of 41.3 (IQR 24.7-63.1) months, 10.5% of NFAIs developed ACS. The risk for developing ACS was higher in patients with higher serum cortisol post-DST levels (HR 6.45 for each mu g/dL, p = 0.001) at diagnosis. Significant tumour growth was observed in 5.2% of cases. The risk of tumour growth was higher in females (HR 10.7, p = 0.004). Conclusions: The frequency of re-evaluation with DST in NFAIs during the initial 5 years from diagnosis can probably be tailored to the serum cortisol post-DST level at presentation. Re-evaluation of NFAIs with imaging studies, on the other hand, seems unnecessary in most cases, particularly if the initial imaging demonstrates features specific to typical adenoma, given the low rate of significant tumour growth. PB Mdpi YR 2021 FD 2021-12-01 LK https://hdl.handle.net/10668/25158 UL https://hdl.handle.net/10668/25158 LA en DS RISalud RD Apr 17, 2025