What is the role of stereotactic radiotherapy for cancer patients with brain metastases?
Stereotactic radiotherapy (SRT) is a key treatment for brain metastases because it delivers high doses of radiation to tumors with very little effect on surrounding healthy brain tissue. This precision allows for high rates of local control and better preservation of neurocognitive function compared to older whole-brain radiation methods 2. Doctors use SRT to relieve symptoms like headaches and neurological deficits caused by tumor growth 5.
What the research says
SRT is widely adopted for patients with one to four brain metastases because it offers superior preservation of brain function while effectively targeting tumors 27. For patients with five to 20 metastases, recent trials show that SRT targeting individual tumors can improve symptom severity and daily functioning compared to whole-brain radiation with hippocampal avoidance 4. This approach avoids radiating normal brain tissue, which helps prevent cognitive decline often seen with whole-brain treatments 5.
Technological advances have expanded SRT use to include fractionated regimens for larger tumors or those near critical structures 27. SRT can also be combined with surgery, either before or after removing a tumor, to improve outcomes 2. Furthermore, SRT is now being explored alongside systemic therapies like immunotherapy and targeted drugs, creating a multidisciplinary approach to manage complex cases 27.
Guidelines recommend SRT alone for patients with one to four unresected metastases when no other systemic options exist 6. For symptomatic metastases, local therapy like SRT is recommended regardless of the systemic treatment used 6. However, decisions to defer local therapy should be made carefully through multidisciplinary discussion to weigh benefits and harms 6.
What to ask your doctor
- Is stereotactic radiotherapy an appropriate option for my specific number and location of brain metastases?
- How does SRT compare to whole-brain radiation for preserving my cognitive function in my case?
- Can SRT be combined with my current systemic therapy or surgery to improve outcomes?
- What are the risks of fractionated SRT for larger tumors or those near critical brain areas?
- Should I consider SRT now or wait for my systemic therapy to work first?
This question is drawn from common patient questions about Neurology and answered using cited medical research. We do not provide individualized advice.