This is a very interesting drug. It is a smart bomb. It seeks out IL13Ra2 which is a cell surface protein present on many types of cancer cells (including Glioblastomas, and DIPG), and rarely found on normal cells. It carries along a pseudomonas exotoxin that kills the cells that the drug attaches to. The net effect is that it kills tumor cells without harming the normal cells. The Musella Foundation has given a few grants to support the creation of this drug over the last 11 years and I am so happy to see it has received orphan designation. That will make it easier and cheaper to bring it to patients.