Background: In computed tomography lung cancer screening programs, up to 30% of all resections are futile. OBJECTIVE: To investigate whether a preoperative positron emission tomography (PET) after a conclusive or inconclusive nonsurgical workup will reduce the resection rate for benign disease in test-positive participants of a lung cancer screening program. Methods: (18)F-Fluorodeoxyglucose-PET scans were made in 220 test positives. Nodules were classified as positive, indeterminate, or negative based on visual comparison with background activity. Gold standard for a positive PET was the presence of cancer in the resection specimen or the detection of cancer during more than 2 years follow-up. Sensitivity, specificity, positive predictive value, and negative predictive value (NPV) were calculated at participant level and 95% confidence intervals (CIs) constructed. Results: The sensitivity of PET to detect cancer was 84.2% (95% CI: 77.6-90.7%), the specificity 75.2% (95% CI: 67.1-83.3), the positive predictive value 78.9% (95% CI: 71.8-86.0), and the NPV 81.2% (95% CI: 73.6-88.8). The resection rate for benign disease was 23%, but 26% of them had a diagnosis with clinical consequences. A preoperative PET after an inconclusive nonsurgical workup reduced the resection rate for benign lesions by 11 to 15%, at the expense of missing 12 to 18% lung cancer cases. A preoperative PET after a conclusive nonsurgical workup reduced the resection rate by 78% at the expense of missing 3% lung cancer cases. Conclusion: A preoperative PET scan in participants with an inconclusive nonsurgical workup is not recommended because of the very low NPV, but after a conclusive nonsurgical workup, the resection rate for benign disease can be decreased by 72%.

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Keywords Benign nodule, Lung cancer, PET scan, Positron emission tomography, Pulmonary nodule, Thoracic surgery
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Journal Journal of Thoracic Oncology
van 't Westeinde, S.C, de Koning, H.J, Thunnissen, F.B, Oudkerk, M, Groen, H.J.M, Lammers, J.W.J, … van Klaveren, R.J. (2011). The role of the (18)F-fluorodeoxyglucose-positron emission tomography scan in the Nederlands Leuvens Longkanker Screenings Onderzoek lung cancer screening trial. Journal of Thoracic Oncology, 6(10), 1704–1712. doi:10.1097/JTO.0b013e3182286d0b