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Clinical outcome of dose-escalated image-guided radiotherapy for spinal metastases
Matthias Guckenberger1, Joachim Goebel, Juergen Wilbert
1Department of Radiation Oncology, University of Wuerzburg, Josef-Schneider-Strasse 11, Wuerzburg, Germany. guckenberger_m@klinik.uni-wuerzburg.de
Purpose:
To evaluate the outcomes after dose-escalated radiotherapy (RT) for spinal metastases and paraspinal tumors.
Methods And Materials:
A total of 14 patients, 12 with spinal metastases and a long life expectancy and 2 with paraspinal tumors, were treated for 16 lesions with intensity-modulated, image-guided RT. A median biologic effective dose of 74 Gy(10) (range, 55-86) in a median of 20 fractions (range, 3-34) was prescribed to the target volume. The spinal canal was treated to 40 Gy in 20 fractions using a second intensity-modulated RT dose level in the case of epidural involvement.
Results:
After median follow-up of 17 months, one local recurrence was observed, for an actuarial local control rate of 88% after 2 years. Local control was associated with rapid and long-term pain relief. Of 11 patients treated for a solitary spinal metastasis, 6 developed systemic disease progression. The actuarial overall survival rate for metastatic patients was 85% and 63% after 1 and 2 years, respectively. Acute Grade 2-3 skin toxicity was seen in 2 patients with no late toxicity greater than Grade 2. No radiation-induced myelopathy was observed.
Conclusion:
Dose-escalated irradiation of spinal metastases was safe and resulted in excellent local control. Oligometastatic patients with a long life expectancy and epidural involvement are considered to benefit the most from fractionated RT.