• Michael A Cummings, Sung Jun Ma, Gregory Hermann, Lucas Serra, Yusef Syed, Harish K Malhotra, Yuhchyau Chen, Michael T Milano, Jorge A Gomez-Suescun, Deepinder P Singh, and Anurag K Singh.
• Department of Radiation Oncology, Wilmot Cancer Institute, Rochester, NY. Electronic address: michael_cummings@urmc.rochester.edu.
• Clin Lung Cancer. 2018 Nov 1; 19 (6): 511-517.

PurposeTo evaluate differences in local control (LC), disease-specific (DC), and overall survival (OS) of patients with early-stage non-small-cell lung cancer (NSCLC) treated with single- (SF) versus 5-fraction (FF) stereotactic body radiation therapy (SBRT) at 2 institutions.Patients And MethodsPeripheral early-stage NSCLC cases treated with a median dose of 30 Gy in SF or a median dose of 50 Gy in FF were included per institutional practice. Kaplan-Meier and Cox models were used to assess survival. A matched-pair analysis was performed to account for imbalances. Toxicities including Common Terminology Criteria for Adverse Events (CTCAE) grade 3 pneumonitis, chest wall pain requiring long-acting narcotics, and hospitalization for respiratory events 6 months posttreatment were recorded.ResultsA total of 163 lesions were treated between 2007 and 2015; 65 received SF SBRT and 98 received FF SBRT. Most tumors were T1 (n = 92) and T2 (n = 34) lesions and had adenocarcinoma (n = 77) and squamous cell carcinoma (n = 46) histologies, respectively. In the matched cohort, there were no differences in OS, LC, DC, or progression-free survival between the groups. LC and OS at 1 year in the matched cohort was 95% and 88%, and 87% and 84% in the SF and FF cohorts, respectively. There was 1 grade 3 pneumonitis in the FF group, and 9 total hospitalizations post-SBRT, 3 (5%) in the SF group and 6 (6%) in the FF group.ConclusionsNo statistically significant differences were seen in LC or DC following SF or FF SBRT in this matched cohort of peripheral lesions. No grade 4 or higher toxicities were reported.Copyright © 2018 Elsevier Inc. All rights reserved.

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