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OA07 - Lymph Node Metastases and Other Prognostic Factors for Local Spread (ID 376)
- Event: WCLC 2016
- Type: Oral Session
- Track: Surgery
- Presentations: 1
OA07.05 - Prognostic Impact of Pleural Lavage Cytology (PLC): Significance of PLC after Lung Resection (ID 5801)
14:20 - 15:50 | Author(s): S. Katsumata
We previously reported the prognostic significance of pleural lavage cytology (PLC) in patients undergoing surgery for non-small-cell lung cancer (NSCLC). Based on a larger cohort of more than 3500 NSCLC patients, which is the largest ever reported from a single institution in the literature, we evaluated the prognostic impact of PLC on survival and recurrence.
From January 1993 to July 2015, 3671 patients underwent R0 surgical resection for NSCLC at our institution and PLC results before (pre-) and after (post-) lung resection were both available. The cytological evaluation was classified into 3 categories: negative (-), suggestive (±), positive (+). We excluded 77 patients whose PLC results were suggestive, and 3594 patients were analyzed. The impact of PLC results on survival and recurrence was evaluated with conventional clinicopathological factors.
The overall survival (OS) of pre-PLC (+) patients was significantly inferior to that of pre-PLC (-) patients. However, the 5-year OS rate of pre-PLC (+) patients was 43%, which was significantly better than that of patients with pleural dissemination (11%). In the following analyses, we divided the patients into 3 groups according to pre/post- PLC results as follows: Pre (-)/ post (-), Group A (n=3461); pre (+)/ post (-), Group B (n=43); and post (+), Group C (n=87). Statistically significant difference was not observed between Groups A and B in OS or in recurrence-free survival (RFS) (p=1.00, 0.28, respectively). However, there were significant differences in OS and RFS between Groups B and C (p=0.01 and p=0.02), and between Groups A and C (p<0.01 and p<0.01), respectively. In univariate and multivariate analyses of clinicopathological factors including post-PLC results to identify prognosticators for OS, post-PLC(+) (hazard ratio (HR) =2.20, p<0.01), older age (≥65 years; HR=1.95, p<0.01), smoking history (+) (HR=1.48, p<0.01), elevated serum CEA level (>5.0 mg/dL; HR=1.28, p<0.01), pathological(p)T≥2 (HR=1.28, p<0.01), pN≥1 (HR=1.48, p<0.01), pStage≥II (HR=1.51, p<0.01), pl(+) (HR=1.43, p<0.01), ly(+) (HR=1.32, p<0.01), and v(+) (HR=1.53, p<0.01) were found to be significant independent unfavorable prognosticators.
The prognostic impact of pre-PLC was moderate and not prohibiting lung resection. Post-PLC was shown to be a strong independent prognostic factor. Its impact on survival of NSCLC patients was very strong, and therefore should be incorporated in the future TNM classification.
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