Long-term survival from a randomized controlled trial of lobectomy by video-assisted thoracoscopic surgery versus thoracotomy for early-stage lung cancer.

Abstract

Objectives: We previously did a randomized clinical trial of lobectomy by VATS or thoracotomy for early-stage lung cancer and found that patients who underwent VATS had less postoperative pain and better quality of life compared with thoracotomy. VATS has since been regarded the preferred surgical method for early-stage lung cancer. It is assumed that long-term survival is not influenced by surgical approach, but this assumption primarily rests on non-randomized comparative studies. We decided to do a long-term follow-up of patients who entered our previous randomized trial.

Methods: Between 2008 and 2014 we randomly assigned 206 patients to VATS (n = 103) or anterolateral thoracotomy (n = 103) for proven or suspected early-stage NSCLC. Records from patients with NSCLC on final pathology were identified in the national electronic patient-record system and the Danish Lung Cancer Registry. Overall, disease-free, and cancer-specific survival were estimated using the Kaplan-Meier method and log-rank test was used to compare the two interventions.

Results: A total of 196 patients had NSCLC on final histopathology. Four patients were lost to follow-up and the remaining 192 were included in this follow-up study with 128 events used for overall survival analysis, 100 events for disease-free survival analysis and 79 events for cancer-specific survival analysis. VATS was used in 99 patients versus 93 by thoracotomy. Median age at time of surgery was 66 years (range 41-85 years). After a median follow-up time of 12.8 years (range 9.9-15.8 years), 33% of patients were alive. Overall, disease-free, and cancer-specific survival were not significantly different between VATS and thoracotomy: Overall survival (p = 0.29), disease-free survival (p = 0.17) and cancer-specific survival (p = 0.31).

Conclusions: We did not find any statistically significant differences in overall, disease-free, or cancer-specific survival between VATS and thoracotomy. However, larger trials with better power for survival analysis are needed to fully explore if there are differences. Alternatively, differences in survival between thoracotomy and VATS for early-stage NSCLC could be investigated by pooling survival data from two similar randomized trials that have since been published.