Published in:
Open Access
01-12-2012 | Research
Can exhaled NO fraction predict radiotherapy-induced lung toxicity in lung cancer patients?
Authors:
Irina Enache, Georges Noel, M-Young Jeung, Nicolas Meyer, Monique Oswald-Mammosser, Emile Urban-Kraemer, Catherine Schumacher, Bernard Geny, Elisabeth Quoix, Anne Charloux
Published in:
Radiation Oncology
|
Issue 1/2012
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Abstract
Background
A large increase in nitric oxide fraction (FeNO) after radiotherapy (RT) for lung cancer may predict RT-induced lung toxicity.
Methods
In this study, we assessed the relationships between FeNO variations and respiratory symptoms, CT scan changes or dose volume histogram (DVH) parameters after RT. We measured FeNO before RT, 4, 5, 6, 10 weeks, 4 and 7.5 months after RT in 65 lung cancer patients.
Results
Eleven lung cancer patients (17%) complained of significant respiratory symptoms and 21 (31%) had radiation pneumonitis images in >1/3 of the irradiated lung after RT. Thirteen patients (20%) showed increases in FeNO >10 ppb. The sensitivity and specificity of a >10 ppb FeNO increase for the diagnosis of RT-associated respiratory symptoms were 18% and 83%, respectively. There was no correlation between DVH parameters or CT scan changes after RT and FeNO variations. Three patients (5%) showed intriguingly strong (2 or 3-fold, up to 55 ppb) and sustained increases in FeNO at 4 and 5 weeks, followed by significant respiratory symptoms and/or radiation-pneumonitis images.
Conclusion
Serial FeNO measurements during RT had a low ability to identify lung cancer patients who developed symptoms or images of radiation pneumonitis. However, three patients presented with a particular pattern which deserves to be investigated.