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INVITED COMMENTARY Dr Pennathur and colleagues [1] describe an experience with 100 patients who have undergone some degree of stereotactic body radiotherapy (SBRT) subsequent to the initial treatment for a primary lung cancer. Their results indicate that, after a median follow-up of 51 months, they observed a 5-year survival of 31%, lending validation to their conclusion that SBRT may play a role in controlling recurrent or persistent lung cancer after failure of initial therapy. The finding is important, as this treatment modality should serve as an option in our arsenal of therapy for patients with limited pulmonary reserve and complicated oncologic histories. As would be expected with complicated cancer patients, those in this report received a variety of therapies such as radiofrequency ablation, chemotherapy, and SBRT as follow-up therapy for having either failed initial therapy (surgery or combined medical therapy) or manifesting another lesion consistent with recurrent lung cancer. The doses of radiation were varied—31% received

Ó 2015 by The Society of Thoracic Surgeons Published by Elsevier

20 Gy or less—and this variable appears to be associated with a significantly increased hazard ratio for (decreased) survival compared with 60 Gy in the regression analysis. Although the location of recurrence was not reported to be a significant variable in the regression, it would be important to know whether location played a role in the variability of treatment dose, potentially leading to a surrogate outcome or statistical bias. The vast majority of the patients in this series (87) had bronchopulmonary disease, which we would interpret as parenchymal or stump-related recurrence. The median onset of SBRT was 25 months, from which it could be inferred that in many situations parenchymal lesions could be new, early-stage primary tumors. It would be very interesting to know how many of these were additional ground glass opacities. Indeed, characterization of recurrence is of significant interest to surgeons, because patients with sublobar resection followed by marginal staple line recurrence are very different from patients

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with a central stump recurrence that would have required a difficult sleeve or a completion pneumonectomy to resect. At our institution, this group of patients, if inoperable, have been considered for intensity-modulated proton therapy, given the restrictions of SBRT to the hilum [2]. Knowledge of response to SBRT in these specific types of cases in Dr Pennathur’s series would be very useful. Certainly, the expert opinion of the surgeon was critical in the initial decision making for therapeutic direction in all of these cases. The complexity of the patients in this series and the bias that was inherent in how each patient arrived at the final treatment modality once the recurrence was identified must be made apparent to the reader. Overall, we applaud this paper as it elucidates the concept of multimodality therapy with the inclusion of SBRT for patients with complex lung cancer courses. To fully appreciate the applicability of these results, however, more information or future reporting of a more homogeneous population will be required. Finally, an arsenal of local therapies that includes surgery, external beam, proton therapy, and SBRT is extremely useful. Perhaps in the future, tissue analysis for

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mutational analysis will obviate the need for local salvage strategies. For this reason, in cases where it is feasible, histologic confirmation of disease and tissue analysis should be pursued. Wayne Hofstetter, MD Ara Vaporciyan, MD Department of Thoracic and Cardiovascular Surgery University of Texas, MD Anderson Cancer Center 1400 Pressler Ave, Unit 1489 Houston, TX 77030 e-mail: [email protected]

References 1. Pennathur A, Luketich JD, Heron DE, et al. Stereotactic radiosurgery/stereotactic body radiotherapy for recurrent lung neoplasm: an analysis of outcomes in 100 patients. Ann Thorac Surg 2015;100:2019–25. 2. Timmerman R, McGarry R, Yiannoutsos C, et al. Excessive toxicity when treating central tumors in a phase II study of stereotactic body radiation therapy for medically inoperable early-stage lung cancer. J Clin Oncol 2006;24:4833–9.

GENERAL THORACIC

Ann Thorac Surg 2015;100:2019–25

Invited Commentary.

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