Lymph node ratio is a prognostic factor for non-small cell lung cancer

Area of Science:

• Oncology
• Medical Statistics
• Surgical Pathology

Background:

• The lymph node ratio (LNR), calculated as positive lymph nodes divided by examined lymph nodes, is a prognostic factor in cancer.
• Previous studies have yielded conflicting results regarding the association between LNR and non-small cell lung cancer (NSCLC) patient survival.
• A definitive understanding of LNR's prognostic value in NSCLC is crucial for treatment stratification.

Purpose of the Study:

• To conduct a meta-analysis evaluating the relationship between LNR and survival outcomes in NSCLC.
• To determine if LNR is an independent predictor of disease-specific survival (DSS) and overall survival (OS) in NSCLC.
• To analyze LNR's prognostic impact within specific NSCLC stages, such as N1.

Main Methods:

• A systematic literature search was performed across PubMed, Embase, and the Cochrane Register of Controlled Trials up to July 2015.
• Included studies focused on the association between LNR and survival (OS and DSS) in NSCLC patients.
• A meta-analysis was conducted on data from 12 studies comprising 25,138 NSCLC patients.

Main Results:

• Higher LNR was significantly associated with decreased OS (HR=1.93) and DSS (HR=1.82) in the overall NSCLC cohort.
• In subgroup analysis, N1 stage NSCLC patients with higher LNR also demonstrated significantly reduced OS (HR=1.60) and DSS (HR=1.82).
• Statistical significance was consistently observed across all primary and subgroup analyses (P < 0.0001).

Conclusions:

• The lymph node ratio (LNR) is a significant and independent predictor of survival in non-small cell lung cancer (NSCLC).
• Elevated LNR is strongly correlated with diminished overall survival and disease-specific survival.
• These findings support the utility of LNR in prognostic assessment and potentially in guiding treatment decisions for NSCLC patients.