Diffuse midline glioma is the kind of diagnosis that ends conversations. It grows into the brainstem, the piece of tissue that runs breathing, heartbeat and swallowing, and it is one of the few brain cancers that mostly strikes children. Surgeons cannot cut it out. Most children die within a year. Engineered immune cells, the technology that transformed blood cancers over the past decade, have repeatedly failed to dislodge it. On October 28, UC San Francisco announced a result that may change t...