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K. Ohshima



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    P1.08 - Poster Session/ Thymoma, Mesothelioma and Other Thoracic Malignancies (ID 224)

    • Event: WCLC 2015
    • Type: Poster
    • Track: Thymoma, Mesothelioma and Other Thoracic Malignancies
    • Presentations: 1
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      P1.08-007 - Programmed Cell Death 1 Ligand 1 (PD-L1) Expression in Thymoma (ID 46)

      09:30 - 09:30  |  Author(s): K. Ohshima

      • Abstract
      • Slides

      Background:
      Programmed cell death 1 ligand-1 (PD-L1) has been reported to be expressed in various malignancies, and is considered to be a prognostic factor and an immunotherapeutic target. The aim of this study was to characterize PD-L1 expression in thymoma and statistical associations between this expression and clinical features.

      Methods:
      We reviewed formalin-fixed paraffin-embedded tissue specimens from 82 thymoma cases at Kurume University. PD-L1 expression was evaluated by immunohistochemistry (IHC). Statistical associations between PD-L1 expression and clinicopathological features were evaluated by using chi-square test and Fisher’s exact test. Disease-free survival (DFS) analysis, the end event of which is recurrence, was performed by the Kaplan-Meier method.

      Results:
      A total of 44 thymoma cases (54%) revealed high PD-L1 expression by IHC. No significant differences were observed between high and low PD-L1 expression with respect to sex (P = 0.938), age (P = 1.000), symptomatic myasthenia gravis (P = 0.471), anti-acetylcholine receptor antibody titer (P = 0.513), primary tumor size (P = 0.527), or curability (P = 0.620). However, high PD-L1 expression was statistically associated with Masaoka’s stage III/IV disease (P = 0.043) and WHO type B2 or B3 thymoma (P = 0.044). DFS after complete resection in high PD-L1 expression cases was significantly worse than that in low PD-L1 expression cases (P = 0.021). Figure 1Figure 2





      Conclusion:
      Characterization of PD-L1 expression in thymoma should enable more effective clinical approaches, including prognostic stratification of patients and use of anti-PD-L1 antibody immunotherapy.

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