Abstract
Physicians are often asked to integrate new oncologic agents with cranial radiation therapy in the treatment of brain metastases. These decisions are often made with incomplete information on safety. A pragmatic approach balances the needs to not delay systemic treatment with the theoretical risk of the agent based upon mechanism of action, distribution, and half-life in the context of treatment volume. This generally involves limited interruptions for radiosurgery for most classes of drugs including treatment during off weeks of cytotoxic chemotherapy and no interruption for immune checkpoint inhibitors. BRAF inhibitors and selected VEGF inhibitors may have higher rates of toxicity when combined with whole-brain radiation therapy. The potential overuse of corticosteroids during cranial radiation therapy may have detrimental impact on the efficacy of immunotherapy.
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Fiveash, J.B., Nikolaev, A., Conry, R.M. (2020). Integrating Systemic Therapy into the Management of Brain Metastases. In: Yamada, Y., Chang, E., Fiveash, J., Knisely, J. (eds) Radiotherapy in Managing Brain Metastases. Springer, Cham. https://doi.org/10.1007/978-3-030-43740-4_8
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