glioblastoma

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A routine exam leads doctors to discover a blood clot above Arizona Senator John McCain's left eye. A biopsy reveals the senator has glioblastoma, an aggressive brain tumor. Each year 12,000 people in the U.S. are diagnosed with this type tumor. Most die within two years.

Cindy Starr / Mayfield Clinic

The Holy Grail in the brain tumor field, according to Mayfield Clinic neurosurgeon Dr. Ron Warnick, would be a non-invasive test allowing personalized therapy, a way to reliably distinguish if the tumor has grown back, and the ability to make a very specific prognosis. This blood test is still in the research stage. WVXU's Ann Thompson, in "Focus on Technology," reports how it would work and the hope that it carries.