The FDA has given orphan drug status to Osiris Therapeutics' Prochymal adult stem cell product, which is being investigated as a treatment for acute Graft vs. Host Disease. Prochymal is intended to modulate the body's immune system. The FDA put Prochymal on a fast track back in January. Release [1]
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[1] http://www.genengnews.com/news/bnitem.aspx?name=1130991XSL_NEWSML_TO_NEWSML_WEB.xml