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  P2.02 - Biology/Pathology (ID 616)

  • Event: WCLC 2017
  • Type: Poster Session with Presenters Present
  • Track: Biology/Pathology
  • Presentations: 1
  • Moderators:
  • Coordinates: 10/17/2017, 09:30 - 16:00, Exhibit Hall (Hall B + C)

  • 23268

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    P2.02-070 - C-MET as a Biomarker in Patients with Surgically Resected Non-Small Cell Lung Cancer (ID 10323)

    09:30 - 09:30  |  Presenting Author(s): Georgios Tsakonas
    • Abstract
    • Slides

    Background:
    c-MET protein overexpression has been proposed as potential prognostic as well as predictive biomarker for targeted therapy in non-small cell lung cancer (NSCLC), albeit its role in the clinical setting has not been firmly established yet and no clear cut-off value exists for immunohistochemistry (IHC) score.
    
    Method:
    We designed a retrospective cohort study, consisting of 725 patients with surgically removed non-small cell lung cancer. IHC was conducted in tissue microarrays (TMA) from lung tumors and healthy tissue adjacent to the tumor, using a specific antibody against human c-MET (MET PharmDx). IHC staining was quantified using H-scores (range 0-300). Association between c-MET H-score and overall survival (OS) as well as progression-free survival (PFS) was explored.
    
    Result:
    c-MET H-score over 20 had a significant protective impact on OS in the multivariate analysis in the whole study population, both as continuous variable (p=0.014), as well as dichotomous variable with HR=0.79 (95%CI: 0.64-0.97, p-value = 0.022). The prognostic effect of c-MET H-score over 20 was stronger in patients who received adjuvant treatment with a HR=0.61 (95% CI: 0.40-0.93, p-value=0.022). In the subgroup of adenocarcinoma and squamous cell carcinoma patients with stage IIA-IIIB disease, the prognostic impact of c-MET was significant even in the univariate analysis (HR=0.60, 95% CI: 0.43-0.83, p-value=0.002).
    
    Conclusion:
    c-MET H score > 20 is a positive prognostic biomarker for OS in early stage NSCLC. This benefit seems to be strongly correlated to adjuvant chemotherapy, therefore rendering c-MET H-score > 20 a possible predictive biomarker for platinum-based adjuvant chemotherapy in early stage NSCLC.
    
    

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