Radiotherapeutic Care of Patients With Stage IV Lung Cancer with Thoracic Symptoms in the Veterans Health Administration
Background: Radiotherapy plays an important role in the palliation of lung cancer, which is the second most common cancer diagnosed in the Veterans Health Administration (VHA). The American Society for Radiation Oncology (ASTRO) developed evidenced-based treatment guidelines for the management of patients with metastatic lung cancer.
Methods: In May 2016, an electronic survey of 88 VHA radiation oncologists (ROs) was conducted to assess metastatic lung cancer management. Demographic information was obtained and 2 clinical scenarios were presented to glean opinions on dose/fractionation schemes preferred, preferences for/against concurrent chemotherapy, and use of endobronchial brachytherapy (EBB) and/or yttrium aluminum garnet (YAG) laser technology. Survey results were assessed for concordance with published ASTRO guidelines.
Results: The survey response rate was 61%, with 93% of the 40 VHA radiation departments represented. Among respondents, 96% were board certified, and 90% held academic appointments. 88% were familiar with ASTRO guidelines. Preferred fractionation schemes were 20 Gy in 5 fractions (69%) and 30 Gy in 10 fractions (22%). The vast majority (98%) did not recommend concurrent chemotherapy for palliation. In the setting of bronchial obstruction with lung collapse, about half (49%) recommended EBB or YAG lung reexpansion before external beam radiotherapy. A minority of respondents use stereotactic body radiotherapy or EBB for palliation.
Conclusion: Most respondents demonstrated up-to-date knowledge of current evidence-based treatment guidelines. We found no distinction in clinical decisions based on demographic profiles.
Role of Endobronchial Brachytherapy
EBB involves implantation of radioactive sources for treatment of endobronchial lesions causing obstructive symptoms.14 Given the lack of randomized data that demonstrate a benefit of EBB over EBRT, the ASTRO guidelines do not endorse routine use of EBB for initial palliative management.15,16 The ASTRO guidelines reference a Cochrane Review of 13 trials that concluded that EBRT alone is superior to EBB alone for initial palliation of symptoms from endobronchial NSCLC.17
Of respondents surveyed, only 1 facility offered onsite EBB. The majority of respondents (72%) preferred the use of conventional EBRT techniques, while 26% refer to non-VHA centers for EBB. Lack of incorporation of EBB into routine VHA practice likely is a reflection of the unclear role of this technology based on the available literature and ASTRO guidelines. In the setting of a right lower lung collapse, more respondents (49%) would consider use of EBB or YAG laser technology for lung reexpansion prior to EBRT.
The ASTRO guidelines recommend that initial EBB in conjunction with EBRT be considered based on randomized data demonstrating significant improvement in lung reexpansion and in patient reported dyspnea with addition of EBB to EBRT over EBRT alone.18 However, the guidelines do not mandate the use of EBB in this situation. It is possible that targeted education regarding the role of EBB would improve knowledge of the potential benefit in the setting of lung collapse and increase the percentage of VHA ROs who would recommend this procedure.
Limitations
The study is limited by lack of generalizability of these findings to all ROs in the country. It is also possible that physician responses do not represent practice patterns with complete accuracy. The use of EBB varied among practitioners. Further study of this technology is necessary to clarify its role in the management of endobronchial obstructive symptoms and to determine whether efforts should be made to increase access to EBB within the VHA.
Conclusions
Most of the ROs who responded to our survey were cognizant and compliant with current ASTRO guidelines on management of lung cancer. Furthermore, familiarity with ASTRO guidelines and management choices were not associated with the respondents’ years in practice, academic appointment, full-time vs part-time status, or familiarity with ASTRO guidelines. This study is a nationwide survey of ROs in the VHA system that reflects the radiation-related care received by veterans with metastatic lung cancer. Responses were obtained from 93% of the 40 radiation oncology centers, so it is likely that the survey accurately represents the decision-making process at the majority of centers. It is possible that those who did not respond to the survey do not treat thoracic cases.
