Background
Although surgery is the standard treatment for early stage non-small cell lung cancer (NSCLC), stereotactic body radiotherapy (SBRT) has disseminated as an alternative therapy. The comparative mortality and toxicity of these treatments for patients of different life expectancies (LE) are unknown.
Methods
Using the Surveillance, Epidemiology, and End Results–Medicare linked database, we identified patients age ≥67 who underwent SBRT or surgery for stage I NSCLC from 2007–2009. Matched patients were stratified into short (<5 years) and long (≥5 years) LE. Mortality and complication rates were compared using Poisson regression.
Findings
Overall, 367 SBRT and 711 surgery patients were matched. Acute toxicity (0–1-month) from SBRT was lower than surgery (7.9% vs. 54.9%, p<.001). At 24-months post-treatment, there was no difference (69.7% vs. 73.9%, p=.31). The incidence rate ratio (IRR) for toxicity for SBRT vs. surgery was 0.74 [95%CI 0.64–0.87].
Overall mortality was lower for SBRT than surgery at 3-months (2.2% vs. 6.1%; p=.005), but by 24-months, overall mortality was higher for SBRT (40.1% vs. 22.3% p<.001).
For patients with short LE there was no difference in lung cancer mortality (IRR 1.01 [95% CI 0.40–2.56]). However for patients with long LE, there was greater overall mortality (IRR 1.49 [95% CI 1.11–2.01]) and a trend towards greater lung cancer mortality (IRR 1.63 [95% CI 0.95–2.79]) for SBRT vs. surgery.
Conclusions
SBRT was associated with lower immediate mortality and toxicity compared to surgery. However, for patients with long LE, there appears to be a relative benefit for surgery compared to SBRT.