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From Why don't brain tumors respond to medication? -- Science Daily

For gliomas, treatment with Mapatumumab appears to be particularly interesting as the death receptor is usually found only on tumor cells, not on other brain cells. Since glioma growth is especially invasive into brain tissue, surgical removal is impossible and chemotherapy is very difficult. Chemotherapy with Mapatumumab could reach all tumor cells and kill them while sparing healthy brain cells without receptors.