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T.R. Pollard



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    MINI 12 - Biomarkers and Lung Nodule Management (ID 109)

    • Event: WCLC 2015
    • Type: Mini Oral
    • Track: Screening and Early Detection
    • Presentations: 1
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      MINI12.12 - Validation of Blood-Based Biomarker for Classification of Patients with Indeterminate Pulmonary Nodules (ID 559)

      17:50 - 17:55  |  Author(s): T.R. Pollard

      • Abstract
      • Presentation
      • Slides

      Background:
      The United States Preventive Services Task Force recommends annual CT-screening for lung cancer in high risk adults but also acknowledges that one disadvantage of CT-screening is the large number of false positive results. Circulating biomarkers may provide a noninvasive, cost-effective means of addressing this disadvantage by assisting with classification of patients with indeterminate pulmonary nodules. Here, we describe the development and testing of a blood-based 5-analyte panel to classify these patients.

      Methods:
      A 5-analyte panel was developed in a training study comprising stage I NSCLC patients (n=95) and healthy smoker controls (n=186). The ability of the biomarker to resolve patients with benign nodules from those with malignant lesions was investigated in two validation studies: (1) Prostate, Lung, Colorectal, Ovarian (PLCO), a CXR-based screening trial, cases n=56, controls n=56; (2) Conversant Bio (CB), cases n=22, controls n=22.

      Results:
      In the training study, the 5-marker classifier (TFPI, OPN, CEA, CYFRA, SCC) resolved malignant cases with 72% sensitivity and 90% specificity (AUC=0.90). In the PLCO validation study, the biomarker distinguished pre-diagnostic cases with an AUC=0.65. In the CB study, a clinical model developed integrating nodule size, nodule location and gender, classified subjects with an AUC=0.79. When added to the clinical model, the biomarker significantly improved overall accuracy (P=0.016; AUC=0.86).

      Conclusion:
      A blood-based biomarker has been developed that accurately classifies patients with indeterminate nodules. Adding this biomarker to currently employed clinical and imaging-based evaluations of pulmonary nodules, may prove valuable in assessing malignant risk.

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