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Y. Okuma



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    MA 16 - Mediastinal, Tracheal and Esophageal Tumor: Multimodality Approaches (ID 675)

    • Event: WCLC 2017
    • Type: Mini Oral
    • Track: Thymic Malignancies/Esophageal Cancer/Other Thoracic Malignancies
    • Presentations: 1
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      MA 16.04 - Phase II Trial of S-1 Treatment as Palliative-Intent Chemotherapy for Previously Treated Advanced Thymic Carcinoma (ID 8627)

      16:00 - 16:05  |  Author(s): Y. Okuma

      • Abstract
      • Presentation
      • Slides

      Background:
      Thymic carcinoma (TC) is a rare cancer with minimal evidence of survival with palliative-intent chemotherapy. Sunitinib and everolimus monotherapies have been proposed as active molecular-targeted approaches based on phase II (Ph II) trials, and S-1, an oral fluoropyrimidine, has been described in the NCCN guideline as an active cytotoxic agent for refractory TC based on a case series. Therefore, we conducted a Ph II trial to study the result of S-1 treatment in patients with refractory TC.

      Method:
      In this Ph II study performed at three cancer centers in Tokyo, we aimed to enroll 26 TC patients previously treated with platinum-based chemotherapy. The patients received S-1 orally twice daily at a dose of 40–60 mg/m2 for 4 weeks, followed by 2 weeks off until progressive disease or unacceptable toxicities. S-1 was used off-label. The primary end-point was determining the objective response rate, and secondary endpoints were progression-free survival (PFS), overall survival (OS), and toxicities.

      Result:
      Twenty-six patients (10 males) were recruited between November 2013 and May 2016. The median age was 63 (27–74) years. Among the 26 patients, 23 had squamous cell carcinoma histology and 10 had an ECOG performance status of 0. Additionally, one patient showed complete response and seven patients showed partial responses, resulting in a 30.8% response rate (95% confidence interval [CI], 16.5–50.0) and a 65.4% disease control rate (95% CI, 46.2–80.6). After a median follow-up of 13.4 months, the median PFS was 4.3 months (95% CI, 2.3–7.6 months) and median OS was 23.4 months (95% CI, 12.8–not reached). Treatment-related adverse events (AEs) of grade ≥3 included neutropenia (12%), skin rash (8%), elevated ALT, decreased WBC count, and fatigue (4%). No treatment-related death was observed. However, treatment was discontinued in three patients (12%) because of AEs.

      Conclusion:
      S-1 for refractory TC confirmed clinical activity with good tolerability. Clinical trial identification: UMIN000010736

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    P1.17 - Thymic Malignancies/Esophageal Cancer/Other Thoracic Malignancies (ID 703)

    • Event: WCLC 2017
    • Type: Poster Session with Presenters Present
    • Track: Thymic Malignancies/Esophageal Cancer/Other Thoracic Malignancies
    • Presentations: 1
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      P1.17-006 - Radiographic Assessment for Tumor Responses of Thymic Carcinoma Using the ITMIG Modified Criteria (ID 8759)

      09:30 - 09:30  |  Author(s): Y. Okuma

      • Abstract
      • Slides

      Background:
      Pleural metastases of thymic carcinoma are relatively common, and their unique growth pattern makes accurate and consistent tumor measurement difficult. To minimize intra-observer variability, The ITMIG proposed modified criteria for measurement of tumor response to nonsurgical therapies for thymic carcinoma.

      Method:
      We conducted a retrospective review of the medical record of advanced or recurrent thymic carcinoma patients treated with chemotherapy between 1980 and 2016 in our institution. The best objective responses were assessed and concorded using the Response Evaluation Criteria in Solid Tumor version 1.1 (RECIST 1.1) and the ITMIG modified criteria.

      Result:
      27 patients ----. All of 6 patients showing PR assessed by the RECIST criteria remained PR using the ITMIG criteria. Of 19 patients showing SD assessed by RECIST, 18 remained SD and 1 reclassified as PR using the ITMIG criteria. Both of 2 patients showing PD assessed by the RECIST criteria remained PD using the ITMIG criteria. The overall response rate assessed by the two methods did not differ significantly, with kappa value of 0.996.

      Conclusion:
      ITMIG modified criteria showed a high concordance rate with RECIST 1.1 criteria in response assessment of thymic carcinoma.

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