Postoperative Radiotherapy May Improve Survival in Certain Patients with pN2 Non-Small Cell Lung Cancer Who Do Not...

Area of Science:

• Oncology
• Thoracic Surgery
• Radiation Oncology

Background:

• Pathologic N2 (pN2) non-small cell lung cancer (NSCLC) presents a challenge for treatment selection.
• Identifying subgroups that benefit from postoperative radiotherapy (PORT) is crucial for optimizing patient outcomes.

Purpose of the Study:

• To determine if specific patient subgroups with pN2 NSCLC benefit from PORT.
• To evaluate the influence of extranodal extension (ENE) on PORT efficacy.

Main Methods:

• Retrospective analysis of 231 patients with pN2 NSCLC treated with surgery and chemotherapy.
• Propensity score matching to compare outcomes between patients who received PORT and those who did not.

Main Results:

• PORT significantly reduced locoregional recurrence (LRR) but did not improve overall survival (OS) or disease-free survival (DFS) in the overall cohort.
• Subgroup analysis indicated improved OS with PORT in patients with 1-3 positive N2 lymph nodes.
• PORT was associated with improved DFS in patients without ENE or lymphatic invasion.

Conclusions:

• While PORT did not improve OS or DFS overall, it effectively reduced LRR in pN2 NSCLC.
• Patients without ENE or lymphatic invasion, and those with limited nodal burden, may represent subgroups who benefit from PORT.
• Findings require cautious interpretation due to retrospective design and small subgroup sizes.