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McCain’s Brain Tumor is Aggressive Form of Cancer

U.S. Senator John McCain is being treated for glioblastoma multiforme, one of the most aggressive forms of brain cancer. It is a malignant tumor that grows at a very rapid rate and is able to shift to new locations within the brain, according to the Mayo Clinic, a non-profit medical research group. Glioblastomas generate microscopic roots that penetrate brain tissue, making complete surgical removal impossible, Mayo says. McCain’s doctors at the Mayo Clinic Hospital in southwestern city of Phoenix, Arizona said they removed all of the tumor that was visible on…

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