Abstract:
BACKGROUND:The practice of treating a solitary pulmonary nodule (SPN) suspicious for stage I non-small cell lung cancer (NSCLC) with stereotactic ablative radiotherapy (SABR) in the absence of pathology is growing. In the absence of randomized evidence, the appropriate prior probability threshold of lung cancer of when such a strategy is warranted can be informed using decision analysis. METHODS:A decision tree and Markov model were constructed to evaluate the relative merits of surveillance, a PET scan-directed SABR strategy (without pathology), or a PET scan-biopsy-SABR strategy, when faced with an SPN at different prior probabilities for lung cancer. Diagnostic characteristics, as well as disease, treatment, and toxicity parameters, were extracted from the literature. Deterministic analysis and probabilistic sensitivity analyses were performed to inform the appropriate lung cancer prior probability threshold between treatment strategies. RESULTS:In the reference case analysis, the prior probability threshold between surveillance and PET scan-biopsy-SABR was 17.0%; between PET scan-directed SABR and PET scan-biopsy-SABR, the threshold was 85.0%. The latter finding was confirmed on probabilistic sensitivity analysis (85.2%; 95% CI, 80.0% to 87.2%). This predicted lung cancer prior probability threshold was most sensitive to the diagnostic sensitivity of transthoracic biopsy (range, 77.2% to 94.0%) and the detection rate of false negatives on CT scan surveillance (range, 82.4% to 92.3%). CONCLUSIONS:This model suggests that if there are concerns about morbidity related to biopsy for an SPN, a PET scan-directed SABR strategy is warranted when the prior probability of lung cancer exceeds a point estimate of 85%.
journal_name
Chestjournal_title
Chestauthors
Louie AV,Senan S,Patel P,Ferket BS,Lagerwaard FJ,Rodrigues GB,Salama JK,Kelsey C,Palma DA,Hunink MGdoi
10.1378/chest.13-2924subject
Has Abstractpub_date
2014-10-01 00:00:00pages
1021-1028issue
4eissn
0012-3692issn
1931-3543pii
S0012-3692(15)50069-Xjournal_volume
146pub_type
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