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Very important article. It points out how the tumor is usually made up of at least 2-4 different subtypes of GBM, and most importantly, that the cells are able to change from one type to another. This may account for how easily a tumor evades treatments. It also opens up a lot of possibilities such as targeting the mechanism that the cells use to change back and forth - perhaps have them all change to an easier cell to kill, Or just target the four subtypes with 4 different treatments and the cells would have no place to hide!