Evaluating the necessity of lymph node sampling in lung adenocarcinoma with ground glass opacities

Haoyang Li ¹, Yuxuan Wu ¹, Shenhu Gao ¹

⁰Department of Thoracic Surgery, the First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang Province, China.

Surgery +

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June 15, 2024

View abstract on PubMed

Summary

For lung adenocarcinoma nodules under 15 mm, lymph node metastasis is rare and primarily occurs in pure solid tumors. Lymph node sampling may be essential for pure solid nodules but less critical for those with ground glass opacities.

Area Of Science

Thoracic oncology
Surgical pathology
Diagnostic imaging

Background

Ground glass opacity (GGO) is common in early lung adenocarcinoma, indicating a favorable prognosis.
GGO is associated with a low incidence of lymph node metastasis.
Current guidelines recommend lymph node sampling for these early-stage cancers, but its necessity is debated.

Purpose Of The Study

To evaluate the necessity of lymph node sampling in lung adenocarcinoma patients with small nodules (≤15 mm).
To determine the correlation between tumor characteristics, specifically consolidation-tumor ratio, and lymph node metastasis.
To refine current guidelines regarding lymph node sampling in early-stage lung adenocarcinoma.

Main Methods

Retrospective analysis of radiologic and clinical data from 2,298 lung cancer patients who underwent surgical resection for lesions ≤15 mm.
Categorization of tumors into four groups based on consolidation-tumor ratio: pure GGO, GGO-predominant, solid-predominant, and pure solid.
Examination of the incidence of lymph node metastasis (N stage) within each categorized group.

Main Results

The study included 2,298 patients with a median age of 54 years.
Pure GGO constituted the majority (62.1%) of tumors.
Lymph node metastasis was exclusively observed in the pure solid group (7 cases), with no metastasis in pure GGO or GGO-predominant groups.

Conclusions

Lymph node metastasis in lung adenocarcinoma nodules ≤15 mm is rare and confined to the pure solid subtype.
Lymph node sampling is crucial for pure solid nodules but may be less necessary for nodules with ground glass opacities.
Findings suggest a potential revision of lymph node sampling guidelines for early-stage lung adenocarcinoma based on tumor composition.