This article talks about using electric field delivery via implanted electrodes. Interesting to think about the best way to approach these therapies - implant electrodes and a battery, or noninvasively, with arrays. Most patients have to make the decision about Optune early in their journey before they realize how serious their glioblastoma is and at first do not like the idea of shaving their heads and wearing arrays - some refuse to use it at first only to accept it when they realize that their lives are at stake but by then it is too late to even bother trying. Compare that to having electrodes implanted into the brain with possible short or long term complications. Hard decisions.