Administration in brainIn addition to administering into the brain tumor, in multiple places to get around the roadblocks, could they not also inject the virus into the blood vessels in the brain so that the virus would be carried to all parts of the brain? Already past the brain barrier, which bypasses that problem. The virus has apparently not caused any harm to healthy brain tissues, so wouldn't it seem better to send the virus throughout the brain and clean everything up at once? Rather than going in multiple times as blocked-off tumors are later identified (after they may have already caused brain damage).