Brain injury after cranial radiotherapy combined with immunotherapy for brain metastases in lung cancer: a retrospective study
Abstract
Aim: To explore whether immune checkpoint inhibitors (ICIs) increase the incidence of radiation-induced brain injury in lung cancer patients with brain metastases. Methods: According to whether they received ICIs within 6 months before and after cranial radiotherapy (CRT), all patients were divided into two groups: ICIs + CRT group and CRT + non-ICIs group. Results: The incidence of radiation necrosis (RN) in the CRT + ICIs group was 14.3%, while that in the CRT + non-ICIs group was 5.8% (p = 0.090). If ICIs were used within 3 months of CRT, there was statistical significance. A maximum diameter of brain metastasis >3.3 cm and cumulative radiation dose of metastatic lesions >75.7 Gy were risk factors for RN. Conclusion: ICIs could increase the risk of RN, especially when used within 3 months of CRT.
Papers of special note have been highlighted as: • of interest; •• of considerable interest
References
- 1. . Brain metastases: epidemiology and pathophysiology. J. Neurooncol. 75(1), 5–14 (2005).
- 2. . Systemic therapy of brain metastases. Curr. Neurol. Neurosci. Rep. 15(2), 518 (2015).
- 3. Abscopal effect in radioimmunotherapy. Int. Immunopharmacol. 85, 106663 (2020).
- 4. The immune contexture in human tumours: impact on clinical outcome. Nat. Rev. Cancer 12(4), 298–306 (2012).
- 5. Tumor-expressed IDO recruits and activates MDSCs in a Treg-dependent manner. Cell Rep. 13(2), 412–424 (2015).
- 6. Previous radiotherapy and the clinical activity and toxicity of pembrolizumab in the treatment of non-small-cell lung cancer: a secondary analysis of the KEYNOTE-001 phase 1 trial. Lancet Oncol. 18(7), 895–903 (2017).
- 7. Combination of radiotherapy and immunotherapy for brain metastases: a systematic review and meta-analysis. Crit. Rev. Oncol. Hematol. 144, 102830 (2019).
- 8. Cerebral radiation necrosis: incidence, pathogenesis, diagnostic challenges, and future opportunities. Curr. Oncol. Rep. 21(8), 66 (2019).
- 9. Immunotherapy and symptomatic radiation necrosis in patients with brain metastases treated with stereotactic radiation. JAMA Oncol. 4(8), 1123–1124 (2018). •• Retrospective study showing that immunotherapy was associated with symptomatic radiation necrosis (RN) in melanoma, which provided us with ideas for our research.
- 10. Combination ipilimumab and radiosurgery for brain metastases: tumor, edema, and adverse radiation effects. J. Neurosurg. 129(6), 1397–1406 (2018).
- 11. . Comparison of the extent of hippocampal sparing according to the tilt of a patient's head during WBRT using linear accelerator-based IMRT and VMAT. Phys Med. 32(5), 657–663 (2016).
- 12. Evolution of radiation-induced brain injury: MR imaging-based study. Radiology 254(1), 210–218 (2010). • Helped us evaluate and diagnose brain RN.
- 13. . Animal cognition. Integr. Zool. 14(2), 128–131 (2019).
- 14. MR signal abnormalities at 1.5 T in Alzheimer’s dementia and normal aging. AJR Am. J. Roentgenol. 149(2), 351–356 (1987).
- 15. Animal models of cough. Respir. Physiol. Neurobiol. 290, 103656 (2021).
- 16. Immune checkpoint inhibitor therapy may increase the incidence of treatment-related necrosis after stereotactic radiosurgery for brain metastases: a systematic review and meta-analysis. Eur. Radiol. 31(6), 4114–4129 (2021). • Study showing that in patients with brain metastases from melanoma, the incidence of RN was higher in those treated with stereotactic radiosurgery + immune checkpoint inhibitors than those receiving stereotactic radiosurgery alone.
- 17. Stereotactic radiosurgery with and without checkpoint inhibition for patients with metastatic non-small cell lung cancer to the brain: a matched cohort study. J. Neurosurg. 133(3), 655–663 (2019).
- 18. . The diagnosis and treatment of pseudoprogression, radiation necrosis and brain tumor recurrence. Int. J. Mol. Sci. 15(7), 11832–11846 (2014).
- 19. Updated response assessment criteria for high-grade gliomas: response assessment in neuro-oncology working group. J. Clin. Oncol. 28(11), 1963–1972 (2010).
- 20. . Management of vestibular schwannomas that enlarge after stereotactic radiosurgery: treatment recommendations based on a 15 year experience. Neurosurgery 58(2), 241–248; discussion 241–248 (2006).
- 21. Recent advances and applications of radiation therapy for brain metastases. Curr. Oncol. Rep. 24(3), 335–342 (2022).
- 22. . Tumor relapse or radionecrosis after radiosurgery: single-photon emission computed tomography for differential diagnosis. In regard to Blonigen et al. Irradiated volume as a predictor of brain radionecrosis after linear accelerator stereotactic radiosurgery. (Int. J. Radiat. Oncol. Biol. Phys. 2010;77:996–1001). Int. J. Radiat. Oncol. Biol. Phys. 78(4), 1279 (2010).
- 23. Frameless linac-based stereotactic radiosurgery (SRS) for brain metastases: analysis of patient repositioning using a mask fixation system and clinical outcomes. Radiat. Oncol. 6, 158 (2011).
- 24. 12 Gy gamma knife radiosurgical volume is a predictor for radiation necrosis in non-AVM intracranial tumors. Int. J. Radiat. Oncol. Biol. Phys. 64(2), 419–424 (2006).
- 25. Reirradiation of primary CNS tumors. Int. J. Radiat. Oncol. Biol. Phys. 36(2), 433–441 (1996). • Study showing that the incidence of RN at higher doses (78–94 Gy) could reach 17%, which is similar to the radiation dose in our study.
- 26. Cerebral radiation necrosis: incidence, outcomes, and risk factors with emphasis on radiation parameters and chemotherapy. Int. J. Radiat. Oncol. Biol. Phys. 65(2), 499–508 (2006).
- 27. Single-fraction stereotactic radiosurgery (SRS) alone versus surgical resection and SRS for large brain metastases: a multi-institutional analysis. Int. J. Radiat. Oncol. Biol. Phys. 99(2), 459–467 (2017).
- 28. Efficacy and safety of fractionated stereotactic radiosurgery for large brain metastases. J. Korean Neurosurg. Soc. 58(3), 217–224 (2015).
- 29. Prolonged survival after multifocal brain radiation necrosis associated with whole brain radiation for brain metastases: case report. J. Neurooncol. 90(1), 85–88 (2008).
- 30. The safety of magnetic resonance imaging-guided laser interstitial thermal therapy for cerebral radiation necrosis. J. Neurooncol. 138(3), 609–617 (2018).
- 31. Laser interstitial thermal therapy for focal cerebral radiation necrosis: a case report and literature review. Stereotact. Funct. Neurosurg. 90(3), 192–200 (2012).
- 32. Clinical dose profile of gamma knife stereotactic radiosurgery for extensive brain metastases. J. Neurosurg. 134(5), 1430–1434 (2020).
- 33. Impact of radionecrosis on cognitive dysfunction in patients after radiotherapy for nasopharyngeal carcinoma. Cancer 97(8), 2019–2026 (2003).
- 34. Topographic distribution of white matter changes and lacunar infarcts in neurodegenerative and vascular dementia syndromes: a post-mortem 7.0-tesla magnetic resonance imaging study. Eur. Stroke J. 1(2), 122–129 (2016).
- 35. Does immunotherapy increase the rate of radiation necrosis after radiosurgical treatment of brain metastases? J. Neurosurg. 125(1), 17–23 (2016). •• Study showing that patients with RN have a longer survival, which is consistent with our conclusion.