Meningiomas represent about one-third of all primary brain tumors and are most frequently found in middle-aged women, the American Brain Tumor Association's website states.

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In the mid-1990s, while at University of California at Los Angeles, Dr. Sawyers became interested in why men with prostate cancer relapsed on hormone therapy the standard treatments, which starve prostate tumors of testosterone, the primary fuel that makes them grow.

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