"Brain tumors are a particularly common form of cancer in children. About 4,300 children and teens will be diagnosed with malignant tumors this year, more than half of them younger than 15."
Brain cancers like Beau Biden’s kill about 15,000 adults each year
by Lenny Bernstein, The Washington Post, 31 May 2015
CHICAGO — A variety of malignant brain and central nervous system tumors kill about 15,000 people in the United States each year, often after difficult courses of surgery, radiation and chemotherapy, according to experts and data from various cancer organizations.
Officials have not disclosed the type of brain cancer that killed Vice President Biden's son Joseph Robinette "Beau" Biden III at age 46 on Saturday night. But assuming he suffered from a primary cancer — not one that spread from another part of the body — the most likely is a glioblastoma, an aggressive cancer of the brain's supportive tissue, two experts said.
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by Lenny Bernstein, The Washington Post, 31 May 2015

Officials have not disclosed the type of brain cancer that killed Vice President Biden's son Joseph Robinette "Beau" Biden III at age 46 on Saturday night. But assuming he suffered from a primary cancer — not one that spread from another part of the body — the most likely is a glioblastoma, an aggressive cancer of the brain's supportive tissue, two experts said.