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T. Terauchi
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OA18 - New Insights in the Treatment of Thymic Malignancies (ID 408)
- Event: WCLC 2016
- Type: Oral Session
- Track: Mesothelioma/Thymic Malignancies/Esophageal Cancer/Other Thoracic Malignancies
- Presentations: 1
- Moderators:N. Girard, S.B. Watzka
- Coordinates: 12/07/2016, 11:00 - 12:30, Schubert 2
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OA18.05 - FDG-PET in Thymic Epithelial Tumors: An Evaluation of Only Resected Tumors (ID 5635)
11:00 - 12:30 | Author(s): T. Terauchi
- Abstract
- Presentation
Background:
[18]F-Fluorodeoxy glucose positron emission tomography (FDG- PET) is thought to be useful for predicting the histologic grade in thymic epithelial tumors (TETs). Although there have been many reports on the use of FDG-PET for evaluating TETs, no previous studies have included only resected cases. Therefore, we investigated the relationship between the degree of FDG-uptake in the tumor and either the WHO histologic subtype or the tumor stage in patients with resected TETs.
Methods:
We retrospectively reviewed FDG-PET findings in 112 patients with TETs (92 with thymomas and 20 with thymic carcinomas) resected at 2 institutes in Japan. The Spearman rank correlation coefficient was used to assess the association between the maximum standardized uptake value (SUV max) in the tumor and both the histologic subtype and tumor stage. The cut-off value of SUV max for differentiating thymoma from thymic carcinoma was calculated using a receiver operating characteristic (ROC) curve analysis.
Results:
The Table shows the relationship between SUV max in the tumor and the WHO histologic subtype. SUV max according to each tumor stage was 3.9 ± 1.7 (mean ± SD) in stage I (n = 89), 4.7 ± 1.7 in stage II (n = 3), 7.4 ± 5.3 in stage III (n =11), and 7.6 ± 3.9 in stage IV (n = 9). SUV max was strongly related to both the WHO histologic subtype and tumor stage (Spearman rank correlation coefficient = 0.485 and 0.432; p = 0.000 and 0.000, respectively). The optimal cut-off value of SUV max for differentiating thymoma from thymic carcinoma was 4.6, with a sensitivity of 80% and a specificity of 70%.SUV max ~Histologic subtype~ No. of patients ~Mean ± SD~ Range A 12 ~3.5 ± 1.3~ ~1.3 – 6.3~ AB 45 ~3.5 ± 1.3~ [1.2 – 6.9] B1 19 ~4.1 ± 0.9~ [2.5 – 6.5] B2 10 [4.2 ± 1.0] [2.7 – 5.9] B3 6 [4.8 ± 2.6] [2.4 – 8.6] Thymic carcinoma 20 [8.0 ± 4.7] [3.0 – 21.8] Total 112 [4.5 ± 2.8] [1.2 – 21.8]
Conclusion:
Our results suggest that FDG-PET is useful for differentiating thymoma from thymic carcinoma. Further studies will be needed to assess other potential clinical applications of FDG-PET for the evaluation of TETs.
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