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T. Mikami



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    P3.15 - SCLC/Neuroendocrine Tumors (ID 731)

    • Event: WCLC 2017
    • Type: Poster Session with Presenters Present
    • Track: SCLC/Neuroendocrine Tumors
    • Presentations: 1
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      P3.15-016a - Prediction of Potential Biomarkers for Personalized Treatment in Pulmonary Large-Cell Neuroendocrine Carcinoma (ID 8869)

      09:30 - 09:30  |  Author(s): T. Mikami

      • Abstract
      • Slides

      Background:
      The prognosis for patients with large-cell neuroendocrine carcinoma (LCNEC) of the lung is extremely poor, and optimal treatment strategies have not yet been established. To improve prognoses in patients with LCNEC, we analyzed immunohistochemical expression and gene mutations of several known molecular targets in LCNECs and compared the expression levels of these targets with those in lung adenocarcinomas.

      Method:
      Twenty-six patients with primary LCNEC and 40 patients with adenocarcinoma were analyzed. Topoisomerase II, epidermal growth factor receptor (EGFR)-L858R, and somatostatin receptor expression were evaluated by immunohistochemistry, and EGFR mutations were evaluated using direct DNA sequencing and the Scorpion-amplified refractory mutation system.

      Result:
      There was no significant difference between patients with LCNEC and adenocarcinoma in relation to age, gender, smoking status, pathological stage (8[th]), performance status, and pulmonary function. In patients with LCNEC and adenocarcinoma, positive rates of topoisomerase II, EGFR-L858R, and somatostatin were 65.4% and 15.0% (p < 0.0001), 0.0% and 20.0% (p = 0.0182), and 50.0% and 5.0% (p < 0.0001), respectively. The frequencies of EGFR mutations were 0.0% and 37.5% in LCNEC and adenocarcinoma (p = 0.0002), respectively.

      Conclusion:
      LCNEC showed overexpression of topoisomerase II, somatostatin, suggesting it was possible to have good response to treatment with etoposide and octreotide compared with adenocarcinoma. EGFR mutations were not observed in LCNEC. These results may indicate a favorable response to adjuvant treatments that are not typically prescribed for non-small cell lung cancer.

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