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J. Maeda
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P1.02 - Poster Session with Presenters Present (ID 454)
- Event: WCLC 2016
- Type: Poster Presenters Present
- Track: Biology/Pathology
- Presentations: 1
- Moderators:
- Coordinates: 12/05/2016, 14:30 - 15:45, Hall B (Poster Area)
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P1.02-082 - The Feasibility of Cell-Free DNA Sequencing for Mutation Detection in Non–Small Cell Lung Cancer Was Detemined by Tumor Volume (ID 6001)
14:30 - 14:30 | Author(s): J. Maeda
- Abstract
Background:
Targeted therapeutics such as tyrosine kinase inhibitors of the epidermal growth factor receptor (EGFR) or anaplastic lymphoma kinase (ALK) have recently been introduced into clinical practice for individuals with NSCLC positive for actionable mutations of EGFR or ALK fusions, respectively. Molecular profiling that is able to predict the response to such drugs has thus become an important therapeutic strategy, allowing selection of the most appropriate treatment for individual patients.
Methods:
Matched lung cancer tissue and serum specimens were collected from 150 patients who underwent surgery at Tokyo Medical University Hospital from January 2013 to July 2014. All tissue samples were stored at –80°C until analysis. Tumor DNA and cfDNA samples were subjected to analysis with next-generation sequencing (NGS) panels for mutation detection.
Results:
All tumor DNA samples were successfully sequenced with the Ion Proton platform. The median read number per amplicon was 15,632. We identified TP53 mutations in 58 cases (38.7%); EGFR mutations in 56 (37.3%); KRAS mutations in 15 (10.0%); CTNNB1 mutations in 7 (4.7%); ERBB2, PIK3CA, BRAF, and PTEN mutations in 3 each (2.0%); and ERBB4, MET, ALK, FGFR2, NRAS, AKT1, and FBXW7 mutations in 1 each (0.7%). No mutation was detected in 22.0% (33/150) of the samples. Serum cfDNA was extracted for all 150 patients, with a median yield (copy number) of 4936 (range, 572 to 373,658). A total of 149 of the 150 (99.3%) cfDNA samples were successfully sequenced with the Ion Proton platform, with sequencing failure being due to an insufficient read number per amplicon in the one unsuccessful case. The median read number per amplicon for the 149 successfully sequenced cfDNA samples was 33,982.
Conclusion:
These results suggested that detection of mutations in cfDNA of patients with disease at stage IA or IB or at T2a or lower is difficult, and that the feasibility of mutation detection with cfDNA may depend on the T factor rather than the N factor. Tumor volume in the cfDNA mutation–positive group was significantly greater than that in the cfDNA mutation–negative group (159.1 ± 58.0 versus 52.5 ± 9.9 cm[3], p = 0.014). The maximum tumor diameter calculated at diagnosis was also larger in the cfDNA mutation–positive group than in the cfDNA mutation–negative group (5.3 ± 0.7 versus 4.1 ± 0.3 cm, p = 0.050). These results suggested that tumor volume is a determining factor for the feasibility of mutation detection with cfDNA.
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P1.04 - Poster Session with Presenters Present (ID 456)
- Event: WCLC 2016
- Type: Poster Presenters Present
- Track: Pulmonology
- Presentations: 1
- Moderators:
- Coordinates: 12/05/2016, 14:30 - 15:45, Hall B (Poster Area)
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P1.04-015 - Clinical Application of Virtual Navigated Bronchial Intervention (ID 4996)
14:30 - 14:30 | Author(s): J. Maeda
- Abstract
Background:
Removal of endobronchial tumor is considered the first treatment of choice to improve respiratory status to dilate and maintain the airway. In patients with inoperable tumors we frequently regard endoscopic treatment as the first treatment of choice, but the indications and decisions regarding the method require careful consideration. We reported the indications and efficacy of virtual navigated bronchial intervention for the treatment of bronchial tumors. To select safer and precisely approach for patients with bronchial tumors, we evaluate virtual navigated bronchial intervention using a high-speed 3-dimensional (3D) image analysis system, Synapse Vincent (Fuji Photo Film Co., Ltd., Tokyo, Japan).
Methods:
We set out to clarify, based on retrospective evaluation of routine work-up data in our charts and patient treatment data, the efficacy of virtual navigated bronchial intervention for the treatment of different types of bronchial tumors, yet representative of the spectrum of conditions we encounter, in order to provide a guide to techniques available in interventional bronchology for obstructive lesions. All computed tomography (CT) must satisfy several conditions necessary to analyze images by Synapse Vincent. Synapse Vincent provides more information not only concerning tumor size and shape, but also whether the tumor invades surrounding tissue and the extent of airway and vessel involvement. Constructed images are displayed on a monitor, which can be utilized for deciding the simulation and interventional strategy and for navigation during interventional manipulation.
Results:
In these cases, Synapse Vincent was used to determine the best planning of virtual navigated bronchial intervention. The feasibility and safety of Synapse Vincent in performing useful preoperative simulation and navigation of interventional procedures lead to the safer, more precise, and less invasive for the patient, and easy to construct an image, depending on the purpose, in 5-10 minutes using Synapse Vincent. Moreover, if the lesion is in the parenchyma or sub-bronchial lumen, it helps to perform simulation with virtual skeletal subtraction to estimate potential lesion movement. By using virtual navigated system for simulation, bronchial intervention was performed with no complications safely and precisely.
Conclusion:
Preoperative simulation using virtual navigated bronchial intervention reduces the surgeon’s stress levels, particularly when highly skilled techniques are needed to operate on lesions. This task, including interventional simulation and navigation both pre- and during manipulation, could lead to greater safety and precision. These technological instruments should be helpful for bronchial intervention procedures, and are also excellent devices for educational training.
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P2.02 - Poster Session with Presenters Present (ID 462)
- Event: WCLC 2016
- Type: Poster Presenters Present
- Track: Locally Advanced NSCLC
- Presentations: 1
- Moderators:
- Coordinates: 12/06/2016, 14:30 - 15:45, Hall B (Poster Area)
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P2.02-017 - A Clinical Outcome of Resected Small-Sized Non-Small Cell Lung Cancer 1 cm or Less in Diameter with N2 Lymph Node Metastasis (ID 5573)
14:30 - 14:30 | Author(s): J. Maeda
- Abstract
Background:
The detection of small-sized (≤ 1cm) non-small cell lung cancer (NSCLC) has increased with the development of high-resolution computed tomography. The reported 5-year survival rate of T1a (≤ 2cm) N0M0 patients is more than 80%, and that of p-T1a (≤ 2cm) N2M0 patients has also steadily improved.
Methods:
Between 1991 and 2011, a total of 917 patients with small-sized (≤ 2cm) NSCLC underwent curative pulmonary resection with systematic lymph node dissection at Tokyo Medical University Hospital and Tokyo Medical University Ibaraki Medical Center. We retrospectively evaluated their postoperative clinical outcomes and survival rates. Survival was analyzed using the Kaplan-Meier method and log-rank test.
Results:
There were 46 (5.0%) patients with mediastinal lymph node metastasis in pT1a (≤ 2cm). And there were 6 (0.6%) patients with pT1a (≤ 1cm) N2M0. The histological types were 3 cases of adenocarcinoma, 2 case of squamous cell carcinoma, and one large cell carcinoma. The respectively status of lymph node metastasis was single station in 2 cases and multiple station in 4 cases. Skip lymph node metastasis was observed in 2 cases. There were 26 cases (56.5%) that were upstaged from clinical diagnosis in pT1a (≤ 2 cm) N2M0 patients. There was one upstaging case from cT1a (≤ 1 cm) N0M0 to pT1a (≤ 2 cm) N2M0. The median overall survival period and 5-year survival of patients in pT1 (≤ 2 cm) N2M0 was 52.1 months and 45%. And patients with pT1a (≤ 1 cm) N2M0 has 29.8 months and 0% (3 year overall survival rate was 33.3%). The recurrence rate was 71.7% (5/6) and disease free survival was 13.2 months.
Conclusion:
This study showed that 5.0% of small-sized (≤ 2 cm) NSCLC had N2 disease and 0.6% of T1a (≤ 1 cm) NSCLC has pN2. Moreover, 56.5% of small-sized (≤ 2 cm) NSCLC was upstaged from clinical diagnosis to pathological diagnosis. The patients with pT1a (≤ 1 cm) N2M0 had worse survival data than the patients with pT1a (≤ 2 cm) N2M0. We recommend systematic lymph node dissection for local treatment as well as accurate diagnosis. As multiple mediastinal node metastases showed an unfavorable prognosis, surgery combined with systematic treatment is recommended.
