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ASTRO issues clinical guideline on radiation therapy for brain metastases

Dr. Kamal Kant KohliWritten by Dr. Kamal Kant Kohli Published On 2022-06-02T20:00:38+05:30  |  Updated On 2022-06-02T20:00:44+05:30
ASTRO issues clinical guideline on radiation therapy for brain metastases
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A new clinical guideline from the American Society for Radiation Oncology (ASTRO) provides guidance on the use of radiation therapy to treat patients with brain metastases. Evidence-based recommendations guide the multidisciplinary planning and delivery of advanced radiation therapy techniques to manage intact and resected brain metastases from non-hematologic solid tumors. The guideline,...

A new clinical guideline from the American Society for Radiation Oncology (ASTRO) provides guidance on the use of radiation therapy to treat patients with brain metastases. Evidence-based recommendations guide the multidisciplinary planning and delivery of advanced radiation therapy techniques to manage intact and resected brain metastases from non-hematologic solid tumors. The guideline, which updates ASTRO's original 2012 guideline to reflect recent research developments, is published in Practical Radiation Oncology.

Brain metastases form when cancer cells spread to the brain from a primary tumor located elsewhere in the body, most commonly lung cancer, breast cancer or melanoma. Brain metastases are the most common type of brain tumors – roughly 10 times more common than primary brain tumors. They develop in 20-40% of people diagnosed with cancer, with approximately 200,000 new cases diagnosed in the U.S. each year.

Radiation therapy is commonly used to manage brain metastases, prolong survival and provide relief from headaches, dizziness and other neurological problems these tumors can cause. Whole-brain irradiation, however, is associated with cognitive deterioration. To reduce these adverse effects and preserve patients' quality of life, researchers developed advanced radiation therapy techniques including stereotactic radiosurgery (SRS) and hippocampal avoidance whole brain radiation therapy (HA-WBRT) that result in fewer side effects. These treatments deliver therapeutic doses of radiation to the tumors while limiting exposure to healthy brain tissue.

"In the decade since the previous ASTRO brain metastases guideline, there has been a tremendous evolution in the way we manage patients' disease. The development of stereotactic radiosurgery allowed treatment of limited brain metastases alone, often in a single fraction, while largely sparing the surrounding brain. Additionally, novel techniques such as hippocampal avoidance with whole-brain radiation can greatly improve our patients' quality of life," said Paul D. Brown, MD, chair of the guideline task force and a professor of radiation oncology at the Mayo Clinic in Rochester, Minnesota.

Recent developments to manage brain metastases also include advances in neurosurgical care as well as emerging systemic therapies that may serve as alternates or adjuncts to radiation therapy and surgery. Chemotherapy traditionally has not been a common treatment for brain metastases due to the impenetrability of the blood-brain barrier, but newer medicines such as targeted therapies and immunotherapy show potential to circumvent this hurdle.

"With the emergence of novel radiotherapy techniques and technologies, brain-penetrating drug therapies and neurosurgical interventions, modern management of brain metastases has become increasingly personalized, complex and multidisciplinary. We developed this guideline to help inform and guide clinicians in patient-centered, multidisciplinary care for their patients with brain metastases," said Vinai Gondi, MD, vice chair of the guideline task force and director of research and education at the Northwestern Medicine Cancer Center and Proton Center in Chicago.

Recommendations address patient selection, as well as planning and delivery techniques for radiation therapy to manage intact (i.e., unresected) and resected brain metastases. The guideline also includes treatment algorithms for limited brain metastases and extensive brain metastases. Key recommendations are as follows:

Intact/Unresected Brain Metastases

1. For patients with 1-4 brain metastases and reasonable performance status (ECOG performance status 0-2), stereotactic radiosurgery (SRS) is recommended. For patients with 5-10 brain metastases and reasonable performance status, SRS is conditionally recommended. For patients with tumors exerting mass effect and/or larger size, multidisciplinary discussion with neurosurgery to consider surgical resection is suggested.

2. For patients with symptomatic brain metastases, upfront local therapy (radiation and/or surgery) is strongly recommended. For patients with asymptomatic brain metastases who are eligible for CNS-directed systemic therapy, multidisciplinary and patient-centered decision-making to determine whether local therapy may be safely deferred is conditionally recommended.

3. For patients with favorable prognosis who have brain metastases that are ineligible for surgery and/or SRS, whole brain radiation therapy (WBRT) is recommended as a primary treatment. Hippocampal avoidance is recommended when appropriate to preserve memory function, as is the addition of memantine to delay neurocognitive decline. Routine adjuvant WBRT added to SRS is not recommended.

4. For patients with poor prognosis and brain metastases, WBRT may not improve outcomes compared to supportive care alone. Reasonable options for these patients include palliative care or hospice, or short-course WBRT for symptomatic brain metastases.

5. Recommendations also include guidance for SRS and WBRT dosing and the use of single-fraction versus hypofractionated SRS. Additionally, while the use of SRS is driven by the number of brain metastases, it is critical that other factors, such as the patient's total tumor volume, tumor location, age and extracranial disease status, should be taken into consideration during patient-centered decision making by the multidisciplinary team.

Resected Brain Metastases

a. Radiation therapy is recommended for all patients following resection of brain metastases to improve intracranial control. For patients with limited brain metastases after resection, post-operative SRS is recommended over WBRT to preserve the patient's neurocognitive function and quality of life.

b. SRS prior to brain metastasis resection is conditionally recommended as a potential alternative to post-operative SRS.

Read the full article at:

http://dx.doi.org/10.1016/j.prro.2022.02.003


Practical Radiation Oncology metastases brain radiation therapy metastases brain tumor brain tumor radiation cancer cancer patients cancer cells 
Source : Practical Radiation Oncology
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

    Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as an Editor-in-Chief for the Speciality Medical Dialogues section. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Before Joining Medical Dialogues, he has served at important positions in the medical industry in India including as the Hony. Secretary of the Delhi Medical Association as well as the chairman of Anti-Quackery Committee in Delhi and worked with other Medical Councils in India. Email: editorial@medicaldialogues.in. Contact no. 011-43720751

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