There was a similar study done with patients who had suffered heart attacks. I heard about it on the news last week but do not know where the study was conducted or how many people were in the study.

They were doing autologous bone marrow injections into disease heart muscle after a heart attack. All patients got an injection but some got their own bone marrow and others a placebo. The patients who got thier own bone marrow , at one year were doing slightly better than those with the placebo (something like 4.8% improvement in placebo group and 5.4% in bone marrow group...not accurate but the rates were in this neighborhood statistically) However, at the two year mark, those who had received had improved cardiac output and general overall fitness while the placebo group had deteriorated and some had succumbed to additional heart attacks and a couple had died.

It certainly causes one to wonder if we do not have some ability to repair our bodies with techniques of this nature.