| Summary: | Wen-Cai Li,1,* Zhen Wang,2,* Jie Gao,2 Han Zhou,2 Jing Li,2 Xi-Xu Zhu3 1Department of Radiation Oncology, Jinling Hospital, The First School of Clinical Medicine, Southern Medical University, Guangzhou, People’s Republic of China; 2Department of Medical Radiation Oncology, Jinling Hospital, Nanjing, Jiangsu, 210002, People’s Republic of China; 3Department of Medical Radiation Oncology, Jinling Hospital, First School of Clinical Medicine, Southern Medical University, Nanjing, Jiangsu, 210002, People’s Republic of China*These authors contributed equally to this workCorrespondence: Xi-Xu ZhuDepartment of Medical Radiation Oncology, Jinling Hospital, First School of Clinical Medicine, Southern Medical University, Nanjing, Jiangsu, 210002, People’s Republic of ChinaTel/Fax +86-025-80860078Email zhuxixu@hotmail.comPurpose: The study aimed to assess the efficacy and safety of stereotactic body radiotherapy (SBRT) using CyberKnife (CK) in patients with postoperative thoracic oligo-recurrence/metastasis of non-small-cell lung cancer (NLCLC), and to analyze the prognostic factors affecting overall survival after SBRT.Patients and Methods: A total of 44 patients with postoperative thoracic oligo-recurrence/metastatic of NLCLC treated with SBRT were reviewed. Thoracic oligo-recurrence/was defined as 1– 3 loco-regional confined to lung lobe, hilar/mediastinal lymph nodes, bronchial stump, or chest wall. Primary endpoints included local control (LC), overall survival (OS), progression-free survival (PFS) and toxicity. Prognostic factors that affected these patients were analyzed by the univariate and multivariate analysis by Kaplan–Meier methods and Cox regression models, respectively.Results: The median follow-up time after salvage SBRT was 48.5 months. Measuring from the date of salvage SBRT, the median OS of the 44 patients was 52.60 (95% CI: 29.59– 75.60) months. 1-,3-and 5-year OS rates were 97.7%, 65.3% and 47.7%, respectively. The 1-,3-year and 5-year LC rates were 97.7%, 85.1% and 80.1%, respectively. At 1, 3 and 5 years, the PFS rates were 77.1%, 28.8% and 5.3%, respectively. Multivariate analysis demonstrated that pre-SBRT neutrophil-to-lymphocyte ratio (NLR) and Charlson comorbidity index (CCI) were independent prognostic factors (p < 0.05). The treatment-related side-effects were well tolerated. No patients developed grade 3 or greater pulmonary toxicity.Conclusion: SBRT is a promising salvage therapeutic option for postoperative thoracic oligo-recurrence/metastasis of non-small-cell lung cancer with acceptable toxicity. Low pre-SBRT neutrophil-to-lymphocyte ratio (NLR) and low Charlson comorbidity index (CCI) were associated with a better prognosis and longer survival and might be considered as reliable and independent prognostic factors in these patients treated with SBRT.Keywords: oligo-recurrence, NSCLC, post-surgical recurrence, CyberKnife
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