SBRT Dose Recommendations by Cancer Type

Spinal Metastases

The American Association of Neurological Surgeons recommends using 16-24 Gy in 1 fraction, 24 Gy in 2 fractions, 24-27 Gy in 3 fractions, or 30-35 Gy in 5 fractions for spinal metastases, with the goal of achieving a biological equivalent dose (BED) of at least 50 Gy to optimize local control rates of approximately 90% at 1 year 1, 2, 3
For renal cell carcinoma spinal metastases, 24 Gy in a single fraction using simultaneous integrated boost technique is appropriate, achieving 90% 1-year local control rates and 85% crude local control rates 1, 2
The most common late toxicity is vertebral compression fracture, occurring in 9.4% of patients overall 1, 2

The American College of Radiology recommends using 50 Gy in 5 fractions for central lung tumors to optimize tumor control while minimizing toxicity to critical mediastinal structures 5
For central tumors, the optimal BED10 should be at least 100 Gy, with ranges of 106-146 Gy showing the best outcomes 5
Early studies using 60-66 Gy in 3 fractions for central tumors reported serious and lethal toxicity, making lower doses per fraction essential 5

The National Comprehensive Cancer Network recommends considering SBRT for Ewing sarcoma and osteosarcoma bone metastases, which achieved 85% estimated local control in one series, though significant toxicity occurred with concurrent chemotherapy and reirradiation 6
Conventional palliative radiation (8 Gy in 1 fraction) achieves less than 50% 1-year local control for bulky tumors and should be avoided in patients with longer expected survival 4

The American Society for Radiation Oncology recommends using SBRT to deliver substantially higher biological effective doses compared to conventional fractionation, typically using 6-18 Gy per fraction in 2-8 sessions 4, 7
Traditionally radioresistant tumors (melanoma, renal cell carcinoma, sarcoma) show excellent outcomes with SBRT, with 2-year local control rates of 90% for RCC 4
SBRT achieves direct tumor cell ablation through high BED delivery, with focused beams achieving high biological effectiveness while sparing surrounding tissues 4, 7

The American College of Radiology recommends avoiding conventional low-dose palliative radiation (8 Gy in 1 fraction) for patients expected to survive long enough to experience local progression, as suboptimal doses increase spinal adverse events including cord compression 4
Avoid SBRT for ultracentral lung tumors where the PTV overlaps trachea or main bronchi due to unacceptable toxicity risk 5
Ensure BED10 of at least 100 Gy for lung SBRT to optimize outcomes 5