Glioblastoma is the deadliest type of brain cancer in adults - even with the best treatments available like surgery, radiation, and chemo, most patients only live about 1-2 years, and almost no one survives for 10 years.

The study proposes a new treatment (ketogenic metabolic therapy), but it confirms that glioblastoma is indeed the most aggressive brain tumor with very poor survival despite standard treatments - exactly as the claim states. The study uses these poor outcomes as motivation for testing a new therapy.