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MA 13 - New Insights of Diagnosis and Update of Treatment (ID 674)
- Event: WCLC 2017
- Type: Mini Oral
- Track: Early Stage NSCLC
- Presentations: 1
MA 13.13 - Spread through Air Spaces Is a Prognostic Factor in Wedge Resection of Non-Small Cell Lung Cancer (ID 8439)
15:45 - 17:30 | Author(s): M. Endo
Spread through air spaces (STAS), defined as “micropapillary clusters, solid nests, or single cells beyond the edge of the tumor into air spaces in the surrounding lung parenchyma” (Travis WD, et al. WHO Classification of Tumours of the Lung, Pleura, Thymus and Heart, 2015), has been recognized as a pattern of tumor invasiveness. Because complete lymph node dissection and sufficient surgical margin lengths are difficult to obtain, wedge resection is associated with worse surgical outcomes than those of lobectomy. Because of the insufficient margin length associated with wedge resection, we speculated that STAS has a prognostic impact in wedge resection cases compared with segmentectomy cases. The aim of this study was to clarify the prognostic impact of STAS in patients with non-small cell lung cancer (NSCLC) who underwent wedge resection.
This was a retrospective study using our prospectively collected institutional database, established in May 2004. From May 2004 to May 2017, 1071 patients with NSCLC underwent complete resection. After excluding patients with pure ground glass opacity or multiple lung cancers and those who underwent lobectomy or preoperative therapy, we evaluated 196 patients with clinical stage IA cancer who underwent segmentectomy or wedge resection. TNM staging was performed according to the seventh edition. We assessed the prognostic impact of STAS on stage IA lung cancer cases who underwent wedge resection compared with segmentectomy.
Segmentectomy was performed in 110 patients and wedge resection in 86. The wedge resection cases were older (p<0.001) and had a higher CEA level (p=0.023). The frequencies of STAS were 14.5% and 18.6% in the segmentectomy and wedge resection cases, respectively (p=0.447). STAS was a significant prognostic factor for overall survival in the wedge resection cases on univariate (p=0.003) and multivariate (p=0.013) analyses, but it was not significant in the segmentectomy cases (p=0.597). STAS was a significant prognostic factor for disease-free survival in the wedge resection cases on univariate (p<0.001) and multivariate (p<0.001) analyses, but this was not the case in the segmentectomy cases (p=0.108). STAS was a significant prognostic factor for the recurrence-free rate in the wedge resection cases on univariate (p<0.001) and multivariate (p<0.001) analyses, but it was not significant in the segmentectomy cases (p=0.205).
STAS is a prognosticator of poor survival outcomes in NSCLC patients who underwent wedge resection, but not in those who underwent segmentectomy. We speculate that NSCLC with STAS tends to have invasive characteristics, and wedge resection is not sufficient to improve survival outcomes in such patients.
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