In this Oct. 28, 2014, file photo provided by Duke University, neurosurgeon Dr. John Sampson places a catheter into a glioblastoma patient at Duke in Durham, N.C. One of the world's most dreaded viruses has been turned into an immune system therapy to fight deadly brain tumors. Survival was better than expected for patients in a small study treated with a modified poliovirus, which helped their bodies attack their cancer, doctors reported on Tuesday, June 26, 2018. (Shawn Rocco/Duke Health via AP) ** FILE **
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