Fetal Stem Cells Cause tumor

I was purusing the articles on ABC news, and I was surprised to see that a headline that said fetal stem cells cause tumors in his spine and brain.
Quote from the article:

"Patients, please beware," said Dr. John Gearhart, a stem cell scientist at the University of Pennsylvania who wasn't involved in the Israeli boy's care but who sees similarly desperate U.S. patients head abroad to clinics that offer unproven stem cell injections.

"Cells are not drugs. They can misbehave in so many different ways, it just is going to take a good deal of time" to prove how best to pursue the potential therapy, Gearhart said.

I think that we need to stop emphasizing embryonic stem cells and use adult stem cells. We keep finding negative things about these embryonic stem cells.