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K. Nakagawa
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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): K. Nakagawa
- 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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P3.01 - Poster Session with Presenters Present (ID 469)
- Event: WCLC 2016
- Type: Poster Presenters Present
- Track: Biology/Pathology
- Presentations: 2
- Moderators:
- Coordinates: 12/07/2016, 14:30 - 15:45, Hall B (Poster Area)
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P3.01-006 - Prognostic Impact of Tumor Spread through Air Spaces in Limited Resection for pStage I Lung Cancer (ID 4377)
14:30 - 15:45 | Author(s): K. Nakagawa
- Abstract
Background:
Tumor spread through air space (STAS) is proposed as a new factor of lung cancer invasion, according to the new World Health Organization (WHO) classification. The aim of this study is to elucidate the prognostic impact and conduct a histopathological evaluation of STAS in primary lung cancer patients who underwent limited resection.
Methods:
We retrospectively collected 508 samples from p-Stage I primary lung cancer patients who underwent limited resection between 2004 and 2013. Hematoxylin and eosin stained tumor slides were reviewed to evaluate pathological features, including the presence or absence of STAS, and the morphological pattern in cases with STAS. We defined the pattern of STAS as single cell (SG), small cluster (SM), or large cluster (LG). Clinicopathological characteristics and patient outcome data were collected from medical records. SPSS statistical software (IBM Corporation, Somers, NY, USA) was used for statistical analysis.
Results:
Histological diagnoses were 440 adenocarcinomas (Ad) (including 107 Adenocarcinoma in situ and 144 Minimally invasive adenocarcinoma), 44 squamous cell carcinomas (Sq), and 24 other types of cancer. Seventy-six cases (15.0%: 60 Ad, 9 Sq, and 7 other types of cancer) were positive for STAS. The morphological STAS patterns were 12 SG, 45 SM, and 19 LG, respectively. There was no significant relationship between recurrence rate and morphological STAS pattern. The STAS-positive group was associated with the presence of micropapillary and/or solid components in Ad, and with lymphovascular and pleural invasion, compared to the STAS-negative group (p < 0.01). The median follow-up was 51 months. Eight local recurrences (1.6%), 16 locoregional (lung parenchyma, hilum, mediastinum) recurrences (3.1%), and 10 distant recurrences (2.0%) were recorded. In multivariate analysis, the risk of local (hazard ratio [HR]: 12.75; p < 0.01) and locoregional (HR: 4.12; p = 0.01) recurrence was significantly higher in the STAS-positive group than in the STAS-negative group. However, in a multivariate Cox model the presence of STAS was not associated with distant recurrence (p = 0.58).
Conclusion:
Our results indicated that the presence of STAS is a significant risk factor for local and locoregional recurrence, but not distant recurrence, in p-Stage I lung cancer following limited resection.
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P3.01-015 - Prognostic Impact of Histologic Invasion Factors in Pulmonary Adenocarcinoma, with Particular Focus on the Pattern of Architectural Remodeling (ID 4975)
14:30 - 15:45 | Author(s): K. Nakagawa
- Abstract
Background:
In the 2015 WHO classification, histologic factors that are associated with invasion in primary lung adenocarcinoma (AdCa) include the presence of non-lepidic histologic subtypes (invasive subtypes) and the presence of cancer-associated myofibroblasts (CAFs). The prognostic significance of CAFs in combination with each invasive subtype has not been well assessed. We conducted this study to clarify the prognostic impact of CAFs in the absence of architectural remodeling.
Methods:
We retrospectively collected data and re-evaluated samples from 1052 patients with pathological stage 0 or IA pulmonary AdCa who underwent complete resection at our hospital between 2007 and 2012. HE and elastica van Gieson stains were used for histological evaluation. We defined two invasive subtypes: those with (INV-1) and without (INV-2) architectural remodeling of lung parenchyma. The postoperative recurrence of tumor was analyzed in each group.
Results:
Our reviewed diagnoses were 172 Stage 0 and 880 Stage IA AdCa. Of the 880 stage IA cases, 706 (80.2%) and 174 (19.8%) were categorized as INV-1 and INV-2, respectively. CAFs were observed in all cases in the INV-2 group, but were not always present in the INV-1 group. In the INV-2 group, the median diameter of the invasive component was 6 mm (range: 1-16), the median postoperative follow-up period was 60 months (range: 2-105), and none of the cases developed recurrence. In the INV-1 group, the median postoperative follow-up period was 55 months (range: 1-104) and the estimated 5-year recurrence-free probability by the Kaplan-Meier method was 93.0%. All cases with postoperative recurrence were categorized in the INV-1 group.
Conclusion:
The INV-2 group AdCa had a low risk of recurrence. These findings suggest that certain subtypes of invasive AdCa, which are classifiable based on the architectural remodeling pattern and the presence of CAF, can be considered to have a good prognosis.
