Background
The role of multi-modality therapy in stage IIIB NSCLC remains inadequately studied. Although chemoradiation is currently the mainstay of treatment, randomized trials evaluating surgery are lacking and resection is offered selectively.
Methods
Data of clinical stage IIIB NSCLC patients (T4N2 or any N3) undergoing definitive multimodality therapy were obtained from the National Cancer Database (NCDB). Multivariable Cox regression models were fitted to evaluate variables influencing overall survival (OS).
Results
From 1998-2010, 7,459 clinical stage IIIB NSCLC patients were treated with definitive chemoradiation (CR group), while 1,714 patients underwent chemotherapy, radiation, and surgery in any sequence (CRS group). CRS patients were more likely to be younger, Caucasian, and have slightly smaller tumors (all p < 0.01). There was no difference in Charlson Comorbidity Index (CCI) between the groups (p = 0.5).
In the CRS group, 79% of patients received neoadjuvant therapy. Thirty-day surgical mortality was 3%. Factors associated with improved OS in multivariate analysis included younger age, female gender, decreased CCI, smaller tumor size, and surgical resection (HR 0.57, 95% CI 0.52-0.63). Among patients treated with surgery, incomplete resection was associated with decreased OS (HR 1.52, 95% CI 1.20-1.92). Median OS was longer in CRS patients (25.9 months vs. 16.3 months, p<0.001). Propensity matched analysis on 631 patient-pairs treated with CRS vs. CR confirmed these findings (median OS = 28.9 vs. 17.2 months, p<0.001).
Conclusions
Surgical resection as a part of multimodality therapy may be associated with improved overall survival in highly selected patients with stage IIIB NSCLC. Multidisciplinary evaluation of these patients is critical.