Health Cancer-linked mutation accelerates growth of abnormal stroke-causing brain blood vessels AddThis Sharing Buttons Share to Print Share to Email Share to Facebook Share to Twitter Share to More Study of mouse brain shows the meningeal lymphatics system (purple and pink) could help reduce amyloid. Sandro Da Mesquita, Ph.D. What Researchers have discovered an explanation for why cerebral cavernous malformations (CCMs)—clusters of dilated blood vessels in the brain—can suddenly grow to cause seizures or stroke. Specifically, they found that a specific, acquired mutation in a cancer-causing gene (PIK3CA) could exacerbate existing CCMs in the brain. Furthermore, repurposing an already existing anticancer drug showed promise in mouse models of CCMs in improving brain-vascular health and preventing bleeding into the brain tissue. Previous studies linked the initial formation of CCMs to various environmental factors, including differences in the gut micro