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OA07 - Lymph Node Metastases and Other Prognostic Factors for Local Spread (ID 376)
- Event: WCLC 2016
- Type: Oral Session
- Track: Surgery
- Presentations: 1
OA07.03 - Prognostic Significance of Micrometastases in Mediastinal Lymph Nodes of Patients With Radically Resected Non-Small Cell Lung Cancer (ID 5060)
14:20 - 15:50 | Author(s): M. Pasieka-Lis
Recurrence occurs in 30-50 % of patients operated for early stage non-small cell lung cancer (NSCLC), what suggests the existence of occult metastases at the time of surgery. Preoperative detection of occult micrometastases in mediastinal lymph nodes could contribute to better selection of patients apropriate for surgery. This retrospective study was undertaken to determine the prognostic significance of preoperatively detected mediastinal lymph node (LN) micrometastases in patients treated with radical surgical resection for stage I and II NSCLC.
From January 2007 to December 2010, 82 patients with stage I and 67 patients with stage II NSCLC underwent transcervical extended mediastinal lymphadenectomy (TEMLA) and subsequent radical pulmonary resection. A total of 4841 mediastinal lymph nodes resected during TEMLA procedure and determined as metastases-free by hematoxylin and eosin staining were labelled to detect occult micrometastases (dual immunohistochemical staining with AE1/AE3 and BerEP4 antibodies).
Micrometastases were detected in mediastinal LN of 16 patients (9,7%). 11 patients had only one LN station affected (68,8%). Subcarinal LN were most frequently affected station (11 patients, 68,8%). There was significant correlation between the presence of micrometastases and tumor size. 5-year total survival was significantly better for stage I (64,1%, p=0.0001) and stage II (44,4%, p<0.05) patients without micrometastases comparing to those with micrometastases (18,8%). By multivariate analysis, only the presence of micrometastases was demonstrated to be a significant prognostic factor for 5-year total survival.
Presence of micrometastases in mediastinal LN of patients with radically resected stage I and II NSCL is associated with significantly reduced 5-year total survival. Preoprative detection of micrometastases with immunohistochemical staining of mediastinal LN resected during TEMLA procedure improves staging and may contribute to better patient selection for curative surgery.
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