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Radiosurgery for metastatic brain tumors.
1Katsuta Hospital Mito GammaHouse, Hitachi-Naka, Japan.
Progress in Neurological Surgery
|February 24, 2007
Summary
Gamma Knife (GK) radiosurgery offers a safe and effective treatment for brain metastases, achieving high tumor control rates with few complications. This approach often maintains good brain function until death, outperforming whole brain radiotherapy (WBRT).
Area of Science:
- Neurosurgery
- Radiation Oncology
- Oncology
Background:
- Brain metastases represent a significant challenge in cancer care.
- Gamma Knife (GK) radiosurgery is an evolving treatment modality for these lesions.
- Understanding its efficacy and long-term implications is crucial.
Purpose of the Study:
- To review current concepts and author experience with Gamma Knife (GK) radiosurgery for brain metastases.
- To evaluate the safety, efficacy, and comparative advantages of GK over whole brain radiotherapy (WBRT).
- To identify factors influencing patient survival and treatment outcomes.
Main Methods:
- Review of clinical experience and relevant literature on Gamma Knife (GK) radiosurgery for brain metastases.
- Analysis of treatment parameters, including radiation dose (e.g., <=20 Gy) and lesion number (1-4).
- Comparison of outcomes between GK radiosurgery and whole brain radiotherapy (WBRT), considering survival, recurrence, and complications.
Main Results:
- Gamma Knife (GK) radiosurgery demonstrates a favorable safety profile with high tumor control rates, especially for 1-4 lesions treated with <=20 Gy.
- Radiosurgical complications and recurrence are rare; symptomatic complications like radionecrosis are more common in long-term survivors but rarely impact overall survival.
- Factors predicting longer survival include younger age, better performance status, and absence of active non-brain disease.
- Whole brain radiotherapy (WBRT) did not significantly improve survival or local recurrence rates in the author's experience, while GK offers advantages like fewer hospitalizations, better palliation, and lower dementia incidence.
Conclusions:
- Gamma Knife (GK) radiosurgery is a safe and effective treatment for brain metastases, offering high tumor control and preserving brain function.
- GK provides significant advantages over whole brain radiotherapy (WBRT), including broader treatment applicability and reduced long-term side effects.
- Meticulous MRI follow-up is recommended to monitor for recurrence and tumor necrosis, advocating for irradiation of all detectable tumors.
