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    Jim Gass has undergone stem cell therapy at clinics in Mexico, China, and Argentina to try to recover from a stroke. But doctors found a huge mass with someone else’s cells growing aggressively in his lower spine.CreditCarlos Moreno for The New York Times

    The surgeon gasped when he opened up his patient and saw what was in his spine. It was a huge mass, filling the entire part of the man’s lower spinal column.

    “The entire thing was filled with bloody tissue, and as I started to take pieces, it started to bleed,” said Dr. John Chi, the director of Neurosurgical Spine Cancer at Brigham and Women’s Hospital in Boston. “It was stuck to everything around it.”

    He added, “I had never seen anything like it.”

    Tests showed that the mass was made up of abnormal, primitive cells and that it was growing very aggressively. Then came the real shocker: The cells did not come from Jim Gass. They were someone else’s cells.

    FOR REST OF ARTICLE, GO TO NYTIMES

     
     

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