News Health & Medicine Ultrasound allows a chemotherapy drug to enter the human brain An early-stage clinical trial shows promise for people with a treatment-resistant brain cancer Glioblastoma (green in this CT scan) is a type of brain cancer that is difficult to treat. A study shows how pairing ultrasound with microbubbles temporarily opens the brain’s protective barrier, allowing a chemotherapy drug to enter the organ. DR P. MARAZZI/SCIENCE PHOTO LIBRARY/Getty Images Share this:EmailFacebookTwitterPinterestPocketRedditPrint By McKenzie Prillaman May 2, 2023 at 6:30 pm Cracking the code to brain cancer treatment might start with cracking the brain’s protective shield.