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A. Bachi



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    O01 - Prognostic and Predictive Biomarkers I (ID 94)

    • Event: WCLC 2013
    • Type: Oral Abstract Session
    • Track: Medical Oncology
    • Presentations: 1
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      O01.07 - Randomized Proteomic Stratified Phase III Study of Second Line Erlotinib (E) versus Chemotherapy (CT) in Patients with Inoperable Non-Small Cell Lung Cancer (PROSE): Secondary Endpoint Analysis (ID 3276)

      10:30 - 12:00  |  Author(s): A. Bachi

      • Abstract
      • Presentation
      • Slides

      Background
      EGFR-TKis are more effective in NSCLC patients with EGFR activating mutations. However, about 90% of non-Asian patients are EGFR wild type, and a test for optimizing treatment in pts with wild-type or in patients with undetectable EGFR mutation status or squamous histology is of clinical value. VeriStrat (VS) is a serum protein test that assigns "good" (VSG) or "poor" (VSP) classification and has demonstrated prognostic and predictive utility in retrospective studies. PROSE is the first completed multicenter prospective randomized biomarker validation trial, designed to evaluate the ability of VS to predict survival in 2[nd]- line NSCLC pts treated with E or CT. As reported at 2013 ASCO[1], VSG pts derived similar overall survival (OS) benefit from both agents (hazard ratio (HR) for E=1.06; p=0.71) whereas CT was the superior option for VSP pts (HR for E=1.72; p=0.02). PROSE met its primary endpoint of demonstrating significant treatment*VS interaction with a p-value of 0.031. The present report discusses the results for the secondary endpoints, PFS.

      Methods
      285 pts, stratified by ECOG-PS, smoking, and blinded pre-treatment VS classification, were randomized 1:1 to receive E or CT at standard doses. Primary endpoint was overall survival (OS) and the primary hypothesis was a significant interaction between VS status and treatment. Sample size was calculated based on an estimated 65%/35% VSG:VSP ratio and hazard ratio (HR) for interaction of 2.35, with a 2-sided α=0.05 and 90% power.

      Results
      263 pts (129 CT, 134 E) were included in the per protocol primary analysis. 68% of pts in CT arm and 72% in E arm were classified as VSG, and analysis was performed at 226 survival events.VSP classification was significantly correlated with worse PFS as compared to VSG, in overall comparison (HR=1.75, 95%CI: 1.34-2.95, P <0.001) , in the CT (HR = 1.69, 95%CI: 1.15-2.48, P <0.007) and the E (HR = 1.91, 95%CI: 1.340-2.80, P<0.001) arms, demonstrating its prognostic value also in PFS. In VSG median PFS was 4.8 months (m) on CT, and 2.5 m on E (HR = 1.26, 95% CI: 0.94-1.69, P =0.129); in VSP median PFS was 2.8 m on CT and 1.7 m on E (HR=1.51, 95% CI: 0.96-2.38, P =0.078). No statistical significant interaction was detected (p=0.44)

      Conclusion
      The analysis of PFS and OS indicates that the differential treatment benefit in OS related to VS classification is determined by the combination of prognostic and predictive properties of the test.

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