A comparison of clinical and radiologic outcomes between frame-based and frameless stereotactic radiosurgery for brain metastases
| Autor: | Kyle A. Denniston, Timothy D. Malouff, Chi Lin, Weining Zhen, Abhijeet R. Bhirud, Vivek Verma, Nathan R. Bennion, Andrew O. Wahl |
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| Rok vydání: | 2016 |
| Předmět: |
Adult
Male Frame based medicine.medical_specialty medicine.medical_treatment Planning target volume Radiosurgery Asymptomatic Patient Positioning 030218 nuclear medicine & medical imaging Immobilization Necrosis 03 medical and health sciences 0302 clinical medicine Patient age medicine Humans Radiology Nuclear Medicine and imaging Radiation Injuries Aged Aged 80 and over Brain Neoplasms business.industry Masks Brain Local failure Middle Aged Treatment characteristics Surgery Radiation necrosis Treatment Outcome Oncology 030220 oncology & carcinogenesis Female medicine.symptom Nuclear medicine business |
| Zdroj: | Practical Radiation Oncology. 6:e283-e290 |
| ISSN: | 1879-8500 |
| Popis: | Purpose Modern experiences in stereotactic radiosurgery (SRS) report noninvasive frameless techniques as an effective alternative to frame-based SRS. Frameless techniques potentially increase positional uncertainty and planning target volume margins are frequently used. Here, we compare rates of local control and radiation necrosis in frameless versus frame-based SRS. Methods and materials Ninety-eight patients (170 lesions) with radiologic and clinical follow-up were analyzed. Group 1 contained 34 patients (61 lesions) immobilized with an invasive stereotactic frame. Group 2 had 64 patients (109 lesions) immobilized with a frameless SRS mask. Patient, tumor, and treatment characteristics were recorded, as were intervals to local recurrence and radiation necrosis (asymptomatic and symptomatic). Results Median patient age was 59 years (range, 25-89), and Karnofsky performance scale was 80 (range, 50-100). Median radiologic and clinical follow-up was 6.5 months (range, 0.7-44.3) and 7 months (range, 0.7-45.7). A median of 2 tumors were treated per course (range, 1-5) with a median dose of 18 Gy (range, 13-24 Gy). The median time to local failure was not reached, and Kaplan-Meier estimates of local failure were not statistically significant between groups (P = .303). Actuarial 6-month local failure rates were 7.2% in group 1 and 12.6% in group 2 (P = .295), with 12-month local failure rates of 14.5% and 26.8% (P = .185), respectively. There was no statistically significant difference in symptomatic (P = .391) or asymptomatic (P = .149) radiation necrosis. Six-month radiation necrosis was 0% in group 1 and 1.6% in group 2 (P = .311) with 12-month rates of 20.2% and 3.8%, respectively (P = .059). Median time to necrosis was not reached in group 1, but was 44 months in group 2. Conclusions Frameless SRS demonstrates clinical outcomes comparable to frame-based techniques with respect to local failure and radiation necrosis. |
| Databáze: | OpenAIRE |
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