Trends and costs of stereotactic body radiation therapy in metastatic non-small cell lung cancer.

BACKGROUND

The purpose of this study is to describe stereotactic body radiation therapy (SBRT) use, outcomes, hospitalizations and costs compared to patients receiving chemotherapy among patients with metastatic non-small cell lung cancer (NSCLC).

METHODS

Using the Surveillance, Epidemiology, and End Results (SEER)-Medicare database, we identified patients aged ≥66 with metastatic NSCLC treated with SBRT as first-line treatment between 2004 and 2014. Multivariable logistic regression identified covariates associated with SBRT. Overall survival (OS) between SBRT and chemotherapy was compared using the Kaplan-Meier estimator and Cox proportional hazards regression. To compare hospitalizations and associated costs, we matched patients treated with SBRT to those with comparable prognostic factors receiving chemotherapy.

RESULTS

We identified 215 patients with metastatic NSCLC who received SBRT and 12,486 patients who received chemotherapy as first-line treatment. SBRT use increased from 0.5% to 3% and was associated with older age, female sex, poor disability status, and lower T- and N-stage. OS increased with SBRT, female sex, higher income and decreased with higher Charlson Comorbidity Score ≥2, poor disability status, higher T-stage and higher N-stage. Among a matched sample, SBRT patients underwent fewer hospitalizations chemotherapy patients (73% 81%, P=0.02). Among those hospitalized, SBRT patients incurred higher hospitalization costs ($33,063 $23,865, P<0.001) but costs per month of survival were similar.

CONCLUSIONS

SBRT is increasing among Medicare patients with metastatic NSCLC. Our findings suggest that SBRT may play a role in management of select metastatic NSCLC patients in addition to standard-of-care chemotherapy.