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Elbanna M, Shiue K, Edwards D, Cerra-Franco A, Agrawal N, Hinton J, Mereniuk T, Huang C, Ryan JL, Smith J, Aaron VD, Burney H, Zang Y, Holmes J, Langer M, Zellars R, Lautenschlaeger T. Impact of Lung Parenchymal-Only Failure on Overall Survival in Early-Stage Lung Cancer Patients Treated With Stereotactic Ablative Radiotherapy. Clin Lung Cancer 2020; 22:e342-e359. [PMID: 32736936 DOI: 10.1016/j.cllc.2020.05.024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Revised: 03/28/2020] [Accepted: 05/18/2020] [Indexed: 12/25/2022]
Abstract
INTRODUCTION The impact of lung parenchymal-only failure on patient survival after stereotactic ablative body radiotherapy (SABR) for early-stage non-small-cell lung cancer (NSCLC) remains unclear. PATIENTS AND METHODS The study population included 481 patients with early-stage NSCLC who were treated with 3- to 5-fraction SABR between 2000 and 2016. The primary study objective was to assess the impact of out-of-field lung parenchymal-only failure (OLPF) on overall survival (OS). RESULTS At a median follow-up of 5.9 years, the median OS was 2.7 years for all patients. Patients with OLPF did not have a significantly different OS compared to patients without failure (P = .0952, median OS 4.1 years with failure vs. 2.6 years never failure). Analysis in a 1:1 propensity score-matched cohort for Karnofsky performance status, comorbidity score, and smoking status showed no differences in OS between patients without failure and those with OLPF (P = .8). In subgroup analyses exploring the impact of time of failure on OS, patients with OLPF 6 months or more after diagnosis did not have significantly different OS compared to those without failure, when accounting for immortal time bias (P = .3, median OS 4.3 years vs. 3.5 years never failure). Only 7 patients in our data set experienced failure within 6 months of treatment, of which only 4 were confirmed to be true failures; therefore, limited data are available in our cohort on the impact of OLPF for ≤ 6 months on OS. CONCLUSION OLPF after SABR for early-stage NSCLC does not appear to adversely affect OS, especially if occurring at least 6 months after SABR. More studies are needed to understand if OLPF within 6 months of SABR is associated with adverse OS. These data are useful when discussing prognosis of lung parenchymal failures after initial SABR.
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Affiliation(s)
- May Elbanna
- Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, IN
| | - Kevin Shiue
- Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, IN
| | - Donna Edwards
- Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, IN
| | - Alberto Cerra-Franco
- Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, IN
| | - Namita Agrawal
- Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, IN
| | - Jason Hinton
- Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, IN
| | - Todd Mereniuk
- Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, IN
| | - Christina Huang
- Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, IN
| | - Joshua L Ryan
- Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, IN
| | - Jessica Smith
- Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, IN
| | - Vasantha D Aaron
- Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, IN
| | - Heather Burney
- Department of Biostatistics, Indiana University School of Medicine, Indianapolis, IN
| | - Yong Zang
- Department of Biostatistics, Indiana University School of Medicine, Indianapolis, IN
| | - Jordan Holmes
- Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, IN
| | - Mark Langer
- Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, IN
| | - Richard Zellars
- Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, IN
| | - Tim Lautenschlaeger
- Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, IN.
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