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MINI 20 - Surgery (ID 137)
- Event: WCLC 2015
- Type: Mini Oral
- Track: Treatment of Locoregional Disease – NSCLC
- Presentations: 1
MINI20.10 - Prognostic Impact of Lymph Node Ratio in Patients with Pathologic Stage N1 Non-Small Cell Lung Cancer (ID 3194)
16:45 - 18:15 | Author(s): S. Shin
Current nodal staging for non-small cell lung cancer (NSCLC) only take into account the anatomic location of lymph node (LN). Although among patients with same pathologic N1 NSCLC, they are known to have heterogeneous prognosis and prognostic significance of extent of LN involvement is still uncertain. The objective of current study was to evaluate whether LN ratio (LNR) is a marker of prognostic factor for survival in patients with pathologic stage II/ N1 NSCLC after complete resection
A total of 4,089 consecutive patients underwent curative surgical resection for NSCLC between 2004 and 2012. Of these, 413 patients who found to have pathologic stage II/N1 NSCLC after complete resection were retrospectively analyzed. For LNR, the optimal cutoff value was determined using chi square score, which were calculated using the Cox proportional hazards regression model. The prognostic value of the LNR was calculated by Cox regression hazard model analysis.
The study included 337 males and 76 females with a mean age of 62 years. The mean numbers of metastatic and dissected LN were 1.84 and 26 respectively and the mean LNR was 0.082. The number of the metastatic LN was significantly correlated to the LNR (r=721; p<0.0001). Based on the maximum chi square score and minimum p value approach, the optimal cutoff value of LNR was 0.1 and patients were classified into two groups according to LNR. Both 5-year overall survival rate and the lung cancer-specific survival rate in the high LNR group (LNR ≥0.1) were significantly lower than those in the low-LNR group (overall survival: 55.4.% vs 69.8%, p=0.003; lung cancer specific survival rate: 58.4% vs. 77.0%, p<0.0001) Also, disease free survival (DFS) rates according to LNR were 56.8% in low-LNR group (LNR<0.1) and 35.0% in high-LNR group (LNR≥0.1). DFS rate in the low-LNR group was significantly higher than that in the high-LNR group (p<0.001). LNR is an independently related prognostic factor with overall survival (OR=2.288; 95% CI=1.513~3.459; p<0.0001), lung cancer-specific survival (OR=2.740; 95% CI=1.709~4.395; p<0.0001) and DFS (OR=2.191; 95% CI=1.543~3.110; p<0.0001) after adjustments of clinical variables including sex, age, stage, surgical extent, histology and adjuvant treatment.
LNR is an independent prognostic factor of survival in patients with pathologic N1 NSLC after complete surgical resection.
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