Comparison of the 2021 EUGOGO guidelines and the 2022 ATA/ETA consensus statement for the management of Graves' orbitopathy

Background: In 2021 the European Group on Graves' Orbitopathy (EUGOGO) published clinical practice guidelines for the management of GO, and in 2022 the American and European Thyroid Associations published the ATA/ETA consensus statement on the same topic. Aims: i) to highlight similarities and differences between the two documents, ii) to suggest possible amendments for future revisions. Results & conclusions: The two documents show a high degree of concordance as to classification, assessment, and prevention, as well as to treatment of mild GO, moderate-to-severe and inactive GO, and sight-threatening GO. The major disagreement regards treatment of moderate-to-severe and active GO. The EUGOGO guidelines, written when teprotumumab was not available outside the USA, indicate intravenous glucocorticoids (IVGC) (with/without mycophenolate) as the first-line treatment, whereas the ATA/ETA consensus statement indicates teprotumumab as the first-line treatment for virtually all of the phenotypes of moderate-to-severe and active GO, particularly when exophthalmos is predominant. However, also in the ATA/ETA consensus statement IVGC are the preferred treatment when the goal is GO inactivation and resolution of inflammation, and among the preferred treatments (in combination with orbital radiotherapy) when the goals are inactivation and correction of eye dysmotility. Recent developments to be considered in future revisions of the guidelines/consensus statement include the possible use of biologicals (teprotumumab, tocilizumab) for dysthyroid optic neuropathy, treatment of longstanding, inactive GO with teprotumumab, reconsideration of the cautious use of radioactive iodine in patients with moderate-to-severe and active GO concomitantly treated with IVGC (with/without orbital radiotherapy), use of statins as an adjunct therapy.