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Background  CyberKnife ( CK ) is a novel stereotactic radiosurgery system for treating tumors in any part of the body. It is a non-invasive or minimally invasive tumor treatment modality that can deliver high doses of spatially precise radiation and minimize exposure to neighboring healthy tissues or vital organs. The purpose of this study was to investigate the safety and efficacy of  CK  in the treatment of adrenal tumors.Methods and Results  We performed a retrospective analysis of 26 patients with adrenal tumors who had been treated with  CK  in the radiotherapy center of our hospital between March 2009 and March 2012. Eight patients had primary adrenal tumors and 18 patients had metastatic adrenal tumors. In addition to  CK , 4 patients received chemotherapy and 2 patients received immunotherapy. The average tumor volume was 72.1 cm 3  and the prescribed radiation dosage ranged from 30 to 50 Gy and was fractionated 3 to 5 times with a 58% to 80% isodose line. Abdominal  CT  was performed between 1 to 3 months after the  CK  treatment to evaluate the short-term efficacy with follow-up examinations once every 3 months. Three patients had complete remission, 12 patients had partial remission, 5 patients had stable disease, and 6 patients had progressive illness. The effective rate of pain relief was 93.8% and the disease control rate was 77% with a median overall survival of 17 months and a median progression-free survival of 14 months. Treatment Related toxicity was well-tolerated, but preventative measure need to be taken for radiation enteritis.    Conclusions    CK  is safe and effective for treating adrenal tumors with few adverse reactions. Nonetheless, its long-term effects requires further follow-up.

Treating Adrenal Tumors in 26 Patients with CyberKnife: A Mono-Institutional Experience