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Metastatic pathways to the lower zone by segment in patients with clinical T1 lower lobe non-small cell lung cancer

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Abstract

Objective

Segmentectomy and mediastinal lymph node dissection (LND) may increasingly be used for non-small cell lung cancer (NSCLC). Lymph node metastasis (LNM) distribution varies by lower lobe segments; however, its segment-specific spread to the lower zone (#8, 9) (LZ) in lower lobe NSCLC is seldom reported.

Methods

In total, 352 patients with clinical T1 lower lobe NSCLC who underwent lobectomy with systematic or lobe-specific LND were included for analysis between January 2006 and December 2018.

Results

Fifty-eight (16.2%) patients had LNM (pN1: 24, pN2: 34), and nine (2.6%) had LZ metastasis. LZ metastasis was significantly more frequent in tumors with diameter > 2 cm, tumors without ground-glass opacity on radiological findings, left lung cancer, and basal segment lung cancer (respectively, p = 0.039, 0.006, 0.0177, 0.0024). None of the S6 NSCLC patients had LZ metastasis. Two patients with right basal segment NSCLC had LZ metastases (tumor on S10) as well as N1 lymph node and subcarinal zone metastasis. Seven (8.4%) patients with left basal segment NSCLC had LZ metastasis (tumor on S8: 3, tumor on S10: 4). Of them, three patients with left basal NSCLC had isolated LZ metastasis.

Conclusions

The LND of the LZ can be omitted for clinical T1 patients with S6 NSCLC. In addition, the LND of the LZ may be omitted in right basal NSCLC if intraoperative confirmation of negative N1 and subcarinal zone lymph nodes is obtained; however, it is necessary for left basal segment NSCLC.

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Data availability

The data that support the findings of this study are available from the corresponding author, TM, upon reasonable request.

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Acknowledgements

The authors would like to thank Editage (www.editage.com) for English language editing.

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Correspondence to Tomohiro Maniwa.

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Maniwa, T., Ohue, M., Kanzaki, R. et al. Metastatic pathways to the lower zone by segment in patients with clinical T1 lower lobe non-small cell lung cancer. Gen Thorac Cardiovasc Surg (2024). https://doi.org/10.1007/s11748-024-02021-1

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