Scientists breach brain barriers to attack tumors

The brain is a sort of fortress, equipped with barriers designed to keep out dangerous pathogens. But protection comes at a cost: These barriers interfere with the immune system when faced with dire threats such glioblastoma, a deadly brain tumor for which there are few effective treatments. Researchers have found a novel way to circumvent the brain's natural defenses when they're counterproductive by slipping immune system rescuers through the fortresses' drainage system.