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S. Omura



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    P1.13 - Radiology/Staging/Screening (ID 699)

    • Event: WCLC 2017
    • Type: Poster Session with Presenters Present
    • Track: Radiology/Staging/Screening
    • Presentations: 1
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      P1.13-011b - Nodal Status Based on the Anatomical Location or the Number of Lymph Nodes Metastasis (ID 9012)

      09:30 - 09:30  |  Author(s): S. Omura

      • Abstract

      Background:
      The 8th edition of the TNM staging system for lung cancer has been published. In the new staging system, the N component remains the same as in the previous version. However, the number of involved nodal stations has been previously shown to be correlated with patient outcomes. In the present study, we retrospectively investigated the correlations between the anatomical location versus the total number of metastatic lymph nodes and the outcomes of patients with non-small cell lung cancer.

      Method:
      We retrospectively collected 237 samples (16.1%) from patients with pN1 and N2 primary lung cancer who underwent complete resection between 2004 and 2013. In those samples, we divided N1 samples into N1ss (single station N1) and N1ms (multiple station N1). We also divided samples into hilar N1 (#11, #10; N1h) and peripheral N1 (#14, ＃13, and #12; N1p) subgroups. pN2 lymph nodes were divided into “single station N2 with skip metastasis” (N2ss1), “single station N2 with N1 metastasis” (N2ss2), and N2ms. The clinicopathological factors and outcomes for each group were statistically analyzed.

      Result:
      In this study, per patient, a mean of 17.9 lymph nodes were dissected and the mean number of lymph node metastases was 3.9. The pN1 and pN2 groups consisted of 74 and 163 cases, and their 5-year survival rates were 74.7% and 54.8%, respectively (p = 0.021). The 5-year survival rates of the N1p and N1h groups were 74.7% and 63.6%, respectively. Although the N1h group showed a tendency towards poorer outcomes, no statistically significant difference between the groups was observed (p = 0.114). The 5-year survival rates of the N2ss1 and N2ss2 groups were 65.4% and 62.4%, respectively, and the N2ms group had poorer outcomes (45.0％, p = 0.010). In our cohort of patients with N1 and N2 lymph node metastasis, the number of metastatic lymph nodes was not correlated with patient outcomes.

      Conclusion:
      In the cases of pN1, patients with N1h had poorer outcomes than those with N1p. In the cases of pN2, patients with N2ms had poorer outcomes than those with other subsets of pN2. From a prognostic point of view, classification based on the anatomical location of metastatic lymph nodes may be important. Further accumulation and examination of cases will be necessary to confirm our findings.

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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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      P1.17-017 - Usefulness of FDG-PET for Differentiating Thymic Epithelial Tumors from Malignant Lymphomas (ID 10578)

      09:30 - 09:30  |  Author(s): S. Omura

      • Abstract

      Background:
      It is difficult to diagnose the tumor in the anterior mediastinum by computed tomography. Distinguishing between thymic epithelial tumors and malignant lymphoma is important, because therapeutic strategy is difficult in each disease. The objective of this study was to clarify the usefulness of positron emission tomography (PET) using 18F-fluorodeoxyglucose (FDG) for distinguishing thymic epithelial tumors and malignant lymphoma.

      Method:
      We retrospectively reviewed FDG PET-CT scans of 62 patients pathologically diagnosed by surgery or biopsy as thymic epithelial tumors or malignant lymphoma. FDG uptake was measured as the maximum standard uptake value (SUVmax). Student t tests were used to assess association between SUVmax and pathological diagnosis.

      Result:
      Among the 62 patients, 36 patients had a pathological diagnosis of thymoma: WHO classification type A in 3 patients (11%), type AB in 9 patients (19%), type B1 in 6 patients (19%), type B2 in 15 patients (42%), and type B3 in 3 patients (7%). Eleven patients had the thymic carcinoma. Fifteen patients had the malignant lymphoma. The SUVmax in malignant lymphoma (14.9 ± 6.4) was significantly higher than that in the thymic epithelial tumors (5.1 ± 2.5) (p＜0.001). The SUVmax in thymic carcinoma (7.8 ± 　3.2) was higher than that in the thymoma (4.0 ± 1.5) (p=0.002). The ROC curve of SUVmax for predicting malignant lymphoma indicated that the optimal cutoff value　was 7.3. This value had a sensitivity of 0.89 and a specificity of 0.87

      Conclusion:
      FDG PET-CT is helpful for distinguishing malignant lymphoma from thymic epithelial tumors with cut off value of 7.3.