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X. Cai



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    MA 17 - Locally Advanced NSCLC (ID 671)

    • Event: WCLC 2017
    • Type: Mini Oral
    • Track: Locally Advanced NSCLC
    • Presentations: 1
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      MA 17.02 - Clinical Impact of the Tumor Immune Microenvironment and Immunoscore in Completely Resected Stage IIIA(N2) Non-Small Cell Lung Cancer (ID 9401)

      15:50 - 15:55  |  Author(s): X. Cai

      • Abstract
      • Presentation
      • Slides

      Background:
      Completely resected stage IIIA(N2) non-small cell lung cancer (NSCLC) patients are considered to be a heterogeneous population. The heterogeneity applies to tumor cells but to the microenvironment as well. Mounting evidence suggests that tumor infiltrating lymphocytes (TILs) are of clinical importance. Hence, we aimed to evaluate the role of the immune microenvironment as an immunoscore in a uniform cohort of patients with completely resected stage IIIA(N2) NSCLC.

      Method:
      All patients with pathologic stage IIIA(N2) NSCLC who underwent complete resection in our hospital from 2005 to 2012 were retrospectively reviewed. Tissue microarrays were constructed by the surgical pathology specimens from primary lung tumors. For each specimen, we selected two cores from the tumor center (CT) and two cores from invasive margin (IM) region. Densities of immune cell subpopulations (CD3+, CD45RO+, and CD8+ TILs) were evaluated using immunohistochemistry with image analysis workstation (Vectra 3.0). Immunoscore is based on the numeration of two lymphocyte populations: CD45RO+ memory lymphocytes and CD8+ cytotoxic cells, quantified within the CT and IM. The immunoscore (I) provides a score ranging from I0 when low densities of both cell types are found in both regions, to I4 when high densities are found in both regions. The results were correlated with tumor recurrence and patient survival.

      Result:
      Of the eligible 357 patients, 288 patients with well-established lung tumor samples were obtained and included in the analysis. The median follow-up duration was 54.9 months (range, 23.9-132 months) for the living patients. The 5-year distant metastasis-free survival (DMFS) and overall survival (OS) rates were 26% and 34%, respectively. In univariate analyses, densities of CD3+ cells were associated with neither OS nor DMFS, whereas CD45RO+ cells in IM were prognostic for DMFS (P=0.02) and OS (P=0.05). Combining CD45RO and CD8+ TILs (CT plus IM), the immunoscore(I) significantly increased the prognostic impact. Of the 288 patients, there were 68 (24%) with I0, 64 (22%) I1, 58 (20%) I2, 48 (17%) I3, and 50 (17%) I4. Five-year DMFS and OS rates were 17% and 28% for the group with low immune score (N=190, I0-2), compared with 42% and 45% for the group with high immune score (N=98, I3-4), respectively (DMFS P<0.001; OS P=0.001). Multivariate analyses showed that the immunoscore had independent effects on DMFS (P<0.001) and OS (P<0.001).

      Conclusion:
      The immunoscore in NSCLC may provide powerful prognostic information, including the prediction of DMFS and OS, and thus facilitate clinical decision making regarding systemic therapy in patients with completely resected stage IIIA(N2) NSCLC.

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