I'll just weigh in with the "fact" that there are many different kinds of stem cell treatments; many variant techniques; and many conditions treated.
I had stem cell treatment using my own blood at IBC in Tijuana. I've spoken with dozens of patients through the years who have seen successes. AnnaPurna's comment is accurate and is also based on years of personal experience with stem cell treatments.
Facts can certainly exist without government studies. Hell, I would be dead now if I depended on doctors and their fortresses of medical data to tell me what is safe and what is not safe!
My story:
http://www.whyamistillsick.com/story/