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J. Yoshida
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MINI 19 - Surgical Topics in Localized NSCLC (ID 138)
- Event: WCLC 2015
- Type: Mini Oral
- Track: Treatment of Localized Disease - NSCLC
- Presentations: 1
- Moderators:D. Jablons, B. Stiles
- Coordinates: 9/08/2015, 16:45 - 18:15, 605+607
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MINI19.02 - Mediastinal Nodal Involvement in Patients with Clinical Stage I Non-Small-Cell Lung Cancer - Possibility of Rational Lymph Node Dissection - (ID 2320)
16:45 - 18:15 | Author(s): J. Yoshida
- Abstract
- Presentation
Background:
Recent developments of radiological examinations have been able to bring more accurate information about the biological malignancy of primary tumors in non-small cell lung cancer (NSCLC). The aim of this study is to elucidate the optimal candidate of lobe-specific selective lymph node dissection (LND) that reduces the extent of mediastinal LND according to clinical information including radiological evaluation of primary tumor on thin-section computed tomography (TSCT) and tumor location in clinical(c)-stage I NSCLC patients.
Methods:
Eight hundred and seventy-six patients with c-stage I NSCLC (adenocarcinoma and squamous cell carcinoma), who underwent complete surgical resection between January 2003 and December 2009 were included in this study. For all tumors, we obtained the maximum dimension of the tumor (tumor) and solid component (consolidation) using a lung window level setting from the TSCT scan images, and estimated the consolidation-to-tumor ratio (C/T ratio) for each tumor. We elucidated the lymph node metastatic incidence and distribution according to the primary tumor lobe location and extracted the associated clinicopathological factors with mediastinal lymph node involvement.
Results:
The patients included 490 men and 386 women, with a median age of 66 years old. The radiological findings were ground glass opacity (GGO)-predominant (C/T ratio ≤ 0.5) in 134 patients and solid-predominant (C/T ratio > 0.5) in 742 patients. There were 744 adenocarcinoma cases and 132 squamous cell carcinoma cases, and the incidences of mediastinal lymph node metastasis were 9.9% in adenocarcinoma cases and 4.5% in squamous cell carcinoma cases, respectively. There were no cases with hilar and mediastinal lymph node metastasis in GGO-predominant tumors. There was no significant association of clinical factors with subcarinal lymph node metastasis in right upper-lobe and left upper-division lung adenocarcinoma. In 257 bilateral lower-lobe lung adenocarcinomas, a total of 32 cases (12.5%) were positive for mediastinal lymph node metastasis, and seven cases (2.7%) were negative for subcarinal lymph node metastasis but positive for upper mediastinal lymph node metastasis (mediastinal skip metastasis). An elevated preoperative serum carcinoembryonic antigen (CEA) level (p < 0.001) showed only a significant association with upper mediastinal lymph node metastasis in the patients with bilateral lower-lobe primary lung adenocarcinoma.
Conclusion:
It would be acceptable to perform selective LND in patients with c-stage I NSCLC with GGO-predominant tumor. Elevated serum CEA was associated with upper mediastinal lymph node involvement in lower-lobe primary lung adenocarcinoma with radiologically solid-predominant tumor. We should be careful when applying selective LND to patients with solid-predominant tumor, especially located in the lower lobe.
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MINI 36 - Imaging and Diagnostic Workup (ID 163)
- Event: WCLC 2015
- Type: Mini Oral
- Track: Screening and Early Detection
- Presentations: 1
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MINI36.01 - Three-Dimensional Quantitative Computed Tomography Evaluation of Pulmonary Adenocarcinoma Using Image-Analysis Software (ID 772)
18:30 - 20:00 | Author(s): J. Yoshida
- Abstract
Background:
Several 2-dimensional computed tomography (CT)-based evaluation methods of small-sized lung adenocarcinomas have been reported as predictors of the disease invasiveness. They include the ratio of the maximum diameter of consolidation to the maximum entire tumor diameter (C/T ratio), tumor shadow disappearance rate on mediastinal window images (TDR), and visual estimation of the ratio of ground-glass opacity area (GGO-R). However, these measurements can be poorly reproducible due to possible inter-observer discrepancy, and can be unrepresentative because measuring is done only on one section of a lesion. We have developed a 3-dimensional quantitative entire-nodule evaluation method using novel image-analysis software. The aim of this study is to compare the new method to these 2-dimensional evaluation methods as a predictor of small-sized invasive lung adenocarcinomas.
Methods:
There were 101 consecutive patients with clinical stage IA adenocarcinoma of the lung who underwent complete resection between 2002 and 2005 at our institution, excluding patients undergoing preoperative treatment and those with multiple lung nodules or with a past history of other cancers. Of them, 75 had a nodule separated from the chest wall and mediastinum depicted on preoperative thin section CT scan without contrast enhancement, and they were the subject of this study. The reconstruction interval of the CT scans was 0.2mm and the reconstructed slice thickness was 0.5mm. The image analysis software recognizes a nodule as a collection of cubic voxels. Ground glass opacity (GGO) was defined as the area of increased attenuation in the lung with preservation of the bronchial and vascular margins. As the average CT value of pulmonary arteries on non-contrast-enhanced CT was 50 Hounsfield Unit (HU), we measured the percentage of the voxels over 50 HU in a nodule to identify voxels representing solid component, and the percentage was defined as R-50. Invasive cancer was defined as a nodule with pathological lymphatic permeation, vascular invasion or node involvement. The correlation between invasive lung cancer and clinicopathological factors, including the image findings (C/T ratio, TDR, GGO-R and R-50) was evaluated using multivariate analysis. The areas under the curve (AUC) of receiver operating characteristics curves were compared among the image evaluation methods.
Results:
There were 17 invasive cancers. C/T Ratio, TDR, GGO-R and R-50 were independent predictors of invasive lung cancers (p<0.01). R-50 was equivalent in AUC to the other evaluation methods (AUC: R-50, 0.807; C/T Ratio, 0.800; TDR, 0.809; GGO-R, 0.792, respectively).
Conclusion:
Our new 3-dimensional quantitative evaluation method using image-analysis software had invasive cancer predictability similar to the other 2-dimensional evaluation methods. As this method enables entire-tumor evaluation quantitatively and objectively, it should be more reproducible and reliable than the conventional methods.
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ORAL 35 - Surgical Approaches in Localized Lung Cancer (ID 155)
- Event: WCLC 2015
- Type: Oral Session
- Track: Treatment of Localized Disease - NSCLC
- Presentations: 1
- Moderators:M. de Perrot, J. Mitchell
- Coordinates: 9/09/2015, 16:45 - 18:15, 601+603
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ORAL35.06 - Limited Resection for Non-Small Cell Lung Cancer Referring to Pathology (ID 216)
16:45 - 18:15 | Author(s): J. Yoshida
- Abstract
- Presentation
Background:
Precise preoperative diagnosis of the in-situ or minimally invasive carcinomas may identify patients that can be treated by limited resection. Though some clinical trials of limited resection for lung cancer have started, it will take much time to get results. We have reported a large scale data of limited resection at the previous WCLC meeting. We report here the data of subclass analysis according to the differences of pathology.
Methods:
Data from multiple institutions was collected on 1,737 patients who had undergone limited resection (segmentectomy or wedge resection) for cT1N0M0 non-small cell carcinoma. As 11 patients without pathological diagnosis were excluded, 1726 patients were analyzed to determine the indication of limited resection in pathological differences. Disease free survival (DFS) and recurrence free proportion (RFP) were analyzed.
Results:
Median age was 63 years. Mean maximal diameter of the tumors was 1.4 ± 0.5 cm. DFS and RFP at 5 years were 91.0 % and 93.6 %, respectively. DFSs and RFPs at 5years in pathology were 92.2% and 94.7% in adenocarcinoma (n=1575), 76.3% and 82.4 % in squamous cell carcinoma (SqCC) (n=100), 100% and 100% in carcinoid (n=16), and 73.6% and 75.9 % in others (n=35). Adenocarcinomas were classified using 2 factors, the ratio of consolidation and tumor diameter (C/T) and tumor diameter into 4 groups, group A (C/T ≤ 0.25 and tumor diameter ≤ 2.0 cm), group B (C/T ≤ 0.25 and tumor diameter > 2.0 cm), group C (C/T > 0.25 and tumor diameter ≤ 2.0 cm), and group D (C/T > 0.25 and tumor diameter > 2.0 cm). DFSs and RFPs at 5 years were 96.7% and 98.8% in group A, 100% and 100% in group B, 89.2% and 92.3% in group C, and 76.7% and 77.8% in group D. In all groups of adenocarcinoma, the prognosis in patients who underwent segmentectomy was not superior to wedge resection.The prognosis in both groups A and B was good. These groups seemed to be good candidates of limited resection. The prognosis of group D were not good. Group D seemed not to be a good candidate of limited resection. Prognosis of group C was not bad, however, we could not conclude indication in group C because group C included both part solid tumors and solid tumors. In SqCC, tumor diameter was not prognostic factor and only segmentectomy was favorable prognostic factor (DFSs and RFPs in segmentectomy vs wedge resection: 78.2% and 85.5% vs 65.5% and 65.5%, respectively). In SqCC, there seemed to be indication of limited resection with segmentectomy. In carcinoid, all tumors except one were resected by segmentectomy. Segmentectomy for cT1 carcinoid seemed to be allowed. As prognosis in other pathologies was worse in limited resection, there seemed to be no indication of limited resection.
Conclusion:
Pathological diagnosis was important to determine the indication of limited resection. Measurement of tumor diameter and C/T was useful to determine the indication of limited resection for adenocarcinoma.
Only Members that have purchased this event or have registered via an access code will be able to view this content. To view this presentation, please login, select "Add to Cart" and proceed to checkout. If you would like to become a member of IASLC, please click here.
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P1.04 - Poster Session/ Biology, Pathology, and Molecular Testing (ID 233)
- Event: WCLC 2015
- Type: Poster
- Track: Biology, Pathology, and Molecular Testing
- Presentations: 1
- Moderators:
- Coordinates: 9/07/2015, 09:30 - 17:00, Exhibit Hall (Hall B+C)
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P1.04-009 - Max Collapse and Fibrosis below 5 cm Predict the Prognosis of pT1 Lepidic Predominant Adenocarcinoma (ID 2605)
09:30 - 17:00 | Author(s): J. Yoshida
- Abstract
Background:
According to the International Association for the Study of Lung Cancer , American Thoracic Society, and European Respiratory Society (IASLC/ATS/ERS) classification, lepidic predominant pattern in pT1 lung adenocarcinoma is divided into adenocarcinoma in situ (AIS), minimally invasive adenocarcinoma (MIA), and lepidic predominant invasive adenocarcinoma (LPIA) by using new diagnostic criteria. However the new criteria have many item to diagnose MIA. So we simply classified the pT1 lepidic predominant adenocarcinoma by using only collapse and fibrosis below 5cm as invasive component, and we evaluated prognosis of MIA.
Methods:
A total of 231 patients treated for pT1 lepidic predominant lung adenocarcinoma by complete resection at National cancer center hospital east, Chiba, Japan from January 2003 to December 2010 were assessed. We excluded multiple tumor and mucinous invasive adenocarcinoma from the analysis. We classified 187 patients into AIS, MIA, LPIA, according to the IASLC/ATS/ERS classification. The MIA was defined as group A. In the LPIA, we defined invasive component as collapse and fibrosis 5 cm below, and reclassified into MIA and LPIA. Reclassified MIA and LPIA were defined as Group B and C respectively. We analyzed the prognosis of these patients retrospectively.
Results:
AIS, Group A, Group B, Group C were 52 (22.5%), 29 (12.5%), 39 (16.9), 111 (48.1%) respectively. Positive lymphatic invasion and, or vascular invasion and, or pleural invasion in Group A, Group B, Group C were 0 (0%), 4 (1.2%), 24 (21.6%) respectively. There are significant difference in 5-year recurrence free survival (5y-RFS) between Group A and B (5y-RFS rate 100% versus 88.1%; p = 0.022), and Group A and C (5y-RFS rate 100% versus 88.1%: p = 0.046).
Conclusion:
Max collapse and fibrosis below 5 cm correlated with the prognosis of pT1 lepidic predominant adenocarcinoma. Max collapse and fibrosis below 5cm is more simpl and easy method to measure invasive component than the new IASLC/ATS/ERS classification. This method may have potential to diagnose MIA instead of the IASLC/ATS/ERS classification.
