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Annals of Surgical Oncology

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Lymph Node Micrometastasis Prognosticates Survival for Patients with Stage 1 Bronchogenic Adenocarcinoma

Yijiu Ren MD, Liyan Zhang MD, Huikang Xie MD, Yunlang She MD, Hang Su MD, Dong Xie MD, PhD, Hui Zheng MD, PhD, Liping Zhang MD, Gening Jiang MD, Chunyan Wu MD, Chenyang Dai MD, PhD, Chang Chen MD, PhD
Thoracic Oncology
Volume 25, Issue 13 / December , 2018

Abstract

Background

This study aimed to investigate the significance of lymph node micrometastasis (LNMM) in the lung cancer nodal categories.

Methods

Between 1 January 2009 and 31 December 2013, 589 patients with suspected c-stage 1 and p-T1-2aN0-1M0 lung adenocarcinoma were enrolled in this study. The study evaluated LNMM with cytokeratin (AE1/AE3) and transcription factor-1 (TTF1) (8G7G3/1) expression by immunohistochemistry. Recurrence-free survival (RFS) and overall survival (OS) were compared among the T1-2aN0-1M0 patients stratified by the new N categories.

Results

From 589 patients, 7892 removed lymph nodes were examined, and LNMM was observed in 55 (9.3%) of the patients. The patients without LNMM or N1 had the best RFS (5-year rate: 80% vs 25%; P < 0.001) and OS (5-year rate: 87% vs 43%; P < 0.001), followed by the patients with LNMM, compared with those in the N1 category (RFS: 5-year rate, 25% vs 8%; P = 0.010; OS: 5-year rate, 43% vs 20%; P = 0.009). Similarly, this trend was observed when patients were subdivided into the T1 and T2a categories. Multivariate analysis showed that the new N categories with the addition of LNMM were an independent prognostic factor. This result also was noticed in all subgroups.

Conclusions

The findings showed LNMM to be clinically significant as a risk factor for lung cancer. Clinicians should consider LNMM when estimating N categories to determine prognosis and the best treatment strategy.

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