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Table 3 Ability of a >10 ppb increase in FeNO[1]to predict respiratory symptoms (grade ≥2) and/or radiation-induced CT-scan images (score ≥2) after radiotherapy in 65 patients with lung cancer

From: Can exhaled NO fraction predict radiotherapy-induced lung toxicity in lung cancer patients?

>10 ppb increase in FeNO Sensitivity Specificity Positive predictive value Negative predictive value
Respiratory symptoms 18% 83% 18% 83%
CT-scan images 24% 86% 45% 70%
Respiratory symptoms and/or CT-scan images 22% 87% 55% 61%
  1. Eleven patients developed respiratory symptoms (17%). Thirteen (20%) showed at least one increase >10 ppb within 10 weeks.