Subcarinal lymph node in upper lobe non-small cell lung cancer patients: is selective lymph node dissection valid?

Area of Science:

• Thoracic Surgery
• Surgical Oncology
• Pulmonary Medicine

Background:

• Selective lymph node dissection is crucial in non-small cell lung cancer (NSCLC) management.
• The role of subcarinal lymph node dissection in upper lobe NSCLC remains unclear.
• Understanding subcarinal node involvement is key to optimizing surgical strategies.

Purpose of the Study:

• To determine the frequency and impact of subcarinal node involvement in upper lobe NSCLC.
• To evaluate the validity of omitting subcarinal lymph node dissection in these patients.
• To identify predictors of subcarinal node metastasis.

Main Methods:

• Retrospective review of 1099 patients with upper lobe NSCLC.
• Analysis of lymph node metastasis distribution by node region, tumor location, and histology.
• Assessment of patient outcomes and patterns of failure for those with subcarinal metastases.

Main Results:

• Subcarinal node metastases were identified in 20 patients (1.8%), being least frequent in squamous cell carcinoma (0.5%).
• Patients with subcarinal metastases had a significantly lower 5-year survival rate (9.0%) compared to those with only superior mediastinal metastases (32.0%).
• Clinical diagnosis of nodal metastasis was a significant predictor of subcarinal involvement.

Conclusions:

• Subcarinal node metastases in upper lobe NSCLC are rare but associated with a very poor prognosis.
• Omitting subcarinal lymph node dissection appears justifiable in upper lobe NSCLC, especially for clinical N0 squamous cell carcinoma.
• Further research may refine criteria for selective lymph node dissection in NSCLC.