• Dale Ding, Gautam U Mehta, Mohana Rao Patibandla, Cheng-Chia Lee, Roman Liscak, Hideyuki Kano, Fu-Yuan Pai, Mikulas Kosak, Nathaniel D Sisterson, Roberto Martinez-Alvarez, Nuria Martinez-Moreno, David Mathieu, Inga S Grills, Kevin Blas, Kuei Lee, Christopher P Cifarelli, Gennadiy A Katsevman, Lee John Y K JYK Department of Neurosurgery, University of Pennsylvania, Philadelphia, Pennsylvania, USA., Brendan McShane, Douglas Kondziolka, L Dade Lunsford, Mary Lee Vance, and Jason P Sheehan.
• Department of Neurosurgery, Barrow Neurological Institute, Phoenix, Arizona.
• Neurosurgery. 2019 Mar 1; 84 (3): 717-725.

BackgroundStereotactic radiosurgery (SRS) is a treatment option for persistent or recurrent acromegaly secondary to a growth hormone secreting pituitary adenoma, but its efficacy is inadequately defined.ObjectiveTo assess, in a multicenter, retrospective cohort study, the outcomes of SRS for acromegaly and determine predictors.MethodsWe pooled and analyzed data from 10 participating institutions of the International Gamma Knife Research Foundation for patients with acromegaly who underwent SRS with endocrine follow-up of ≥6 mo.ResultsThe study cohort comprised 371 patients with a mean endocrine follow-up of 79 mo. IGF-1 lowering medications were held in 56% of patients who were on pre-SRS medical therapy. The mean SRS treatment volume and margin dose were 3.0 cm3 and 24.2 Gy, respectively. The actuarial rates of initial and durable endocrine remission at 10 yr were 69% and 59%, respectively. The mean time to durable remission after SRS was 38 mo. Biochemical relapse after initial remission occurred in 9%, with a mean time to recurrence of 17 mo. Cessation of IGF-1 lowering medication prior to SRS was the only independent predictor of durable remission (P = .01). Adverse radiation effects included the development of ≥1 new endocrinopathy in 26% and ≥1 cranial neuropathy in 4%.ConclusionSRS is a definitive treatment option for patients with persistent or recurrent acromegaly after surgical resection. There appears to be a statistical association between the cessation of IGF-1 lowering medications prior to SRS and durable remission.Copyright © 2018 by the Congress of Neurological Surgeons.

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