Long-term results of initial gamma knife radiosurgery for acromegaly

Background and objectives

Acromegaly requires multimodal management. While surgery is first-line, many patients have persistent/recurrent disease. Gamma knife radiosurgery (GKRS) offers precise radiation, but data on its use as initial therapy remain limited. This study aimed to review the outcomes and report on our experience in treating patients with acromegaly using initial GKRS.

Methods

We retrospectively identified 33 patients with acromegaly who underwent GKRS from 1993 until 2016 at the Department of Radiotherapy, the Second Affiliated Hospital of Guangzhou Medical University. These patients had complete endocrine, radiological, and imaging data before and after GKRS. Furthermore, univariate and multivariate analysis was utilized to analyze the potential prognostic factors of endocrine remission and new-onset hypopituitarism.

Results

Thirty-three patients were enrolled in the study. Fifteen patients (45.5%) were males and 18 (54.5%) were females. The median age was 44.0 years (range, 24.9–66.2 years). During a median follow-up of 65.6 months (range, 12.9–297.6), the median margin dose for GKRS was 15.0 Gy (range, 10.8–20.3 Gy). Endocrine remission was achieved in nine of the 33 patients (27.3%) over a mean follow-up of 85.1 months (range, 12.9–161.3). No prognostic factors demonstrated a significant association with endocrine remission. New-onset hypopituitarism occurred in eight patients (24.2%) after GKRS. The tumor control rate was 100%. Only one patient developed worsening visual dysfunction. No new cranial neuropathy was noted.

Conclusions

Our study suggests that initial GKRS represents a viable treatment option for acromegaly patients who are not optimal candidates for surgical resection. It provides high rates of tumor control and a reasonable rate of endocrine remission, coupled with an acceptable safety profile, particularly regarding pituitary function. Nevertheless, longer follow-up and larger prospective studies using standardized modern remission criteria are needed to better define the role of GKRS in the multidisciplinary management of acromegaly.

Full text:

https://www.xiahepublishing.com/3067-6150/NSSS-2025-00034

The study was recently published in the Neurosurgical Subspecialties.

Neurosurgical Subspecialties (NSSS) is the official scientific journal of the Department of Neurosurgery at Union Hospital of Tongji Medical College, Huazhong University of Science and Technology. NSSS aims to provide a forum for clinicians and scientists in the field, dedicated to publishing high-quality and peer-reviewed original research, reviews, opinions, commentaries, case reports, and letters across all neurosurgical subspecialties. These include but are not limited to traumatic brain injury, spinal and spinal cord neurosurgery, cerebrovascular disease, stereotactic radiosurgery, neuro-oncology, neurocritical care, neurosurgical nursing, neuroendoscopy, pediatric neurosurgery, peripheral neuropathy, and functional neurosurgery.

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