COT-07 Cerebrovascular complications in adult patients with malignant brain tumor

Background: According to the development of new treatment modalities, patients with malignant brain tumor have longer survival and they have more chances to have stroke. Study Population: We retrospectively reviewed 509 patients with ischemic stroke and 445 patients with hemorrhagic stroke who visited Kyoto University Hospital between January 2010 and December 2019 and the association with malignant brain tumor was analyzed. The frequency of stroke in 287 patients with primary glioblastoma and 217 patients with metastatic brain tumor was also analyzed. Results: Twenty one (4.1%) patients with ischemic stroke and 26 (5.1%) patients with hemorrhagic stroke patients had malignant brain tumor, and most tumors were either malignant glioma or metastatic brain tumor. A medical history of cranial irradiation was seen in 66.7% of patients with ischemic stroke, and 80% of hemorrhagic stroke occurred within the tumor before starting the treatments. Either ischemic or hemorrhagic stroke occurred in 9.1% of patients with glioblastoma and 4.1% of patients with metastatic brain tumor, and the number of ischemic and hemorrhagic were almost the same. In patients with glioblastoma, nearly half of the stroke cases were associated with bevacizumab. Half of the cases of bevacizumab-related stroke were asymptomatic, while asymptomatic cases were seen in 21.4% for non-bevacizumab cases. Discussion: Stroke is not an uncommon complication in patients with malignant brain tumor but only a restricted number of cases were preventable. Including the cases of bevacizumab-related stroke, which is often asymptomatic, accurate diagnosis and the second prevention would be important.