Medical College of Wisconsin, Milwaukee, WI
Catherine Lee Kinchen, Trent N Taylor, Candice Aitken Johnstone, Jared R. Robbins
Background: Stereotactic body radiation therapy (SBRT) is an emerging modality of treatment designed to deliver high radiation doses in few fractions. We examine practice trends in the use of SBRT for managing bone metastases in patients with breast, kidney, non-small-cell lung, melanoma, or prostate cancer. Methods: We selected patients from the National Cancer Database (2004-2013) diagnosed with bone metastases from breast, kidney, non-small-cell lung, melanoma, or prostate cancer. SBRT fractionation regimens were defined as 12-45 Gy in 1 fraction, 14-50 Gy in 2 fractions, 21-50 Gy in 3 fractions, 28-50 Gy in 4 fractions, and 30-60 Gy in 5 fractions. Standard palliative radiation fractionation regimens were defined as all other cases with 2-40 Gy in 20 fractions or fewer. Results: Patients receiving SBRT regimens made up 1454 of 57,556 total palliative cases. Bone metastases treated with SBRT primarily at the spine (65.5%), hip/pelvis (12.3%), and shoulder/extremity (11.4%). SBRT palliation regimens were used for only 2.5% of patients. Though standard palliative radiation fractionation regimens comprised the majority of treatments (97.5%), SBRT utilization is increasing, with a majority (68.4%) of SBRT cases occurring from 2009-2013. Treatment at an academic center and lack of comorbidities were positively associated with receiving SBRT regimens. Mean survival outcomes were higher for patients receiving SBRT (24.3 months) than patients receiving standard regimens (16.9 months). Conclusions: Though the vast majority of bone metastases were treated with standard palliative radiation fractionation, SBRT utilization increased from 2004-2013, with the greatest portion of SBRT cases occurring at academic institutions. Patients receiving SBRT exhibit better survival outcomes, likely as a result of patient selection practices.
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