All Associated Press News ANN ARBOR, Mich. (AP) - Shares of Aastrom Biosciences Inc., a stem-cell firm that makes tissue-regeneration products, surged on Thursday following an announcement that Food and Drug Administration granted orphan-drug designation to its proprietary Tissue Repair Cells as a treatment for osteonecrosis.
Orphan-drug status is given to medicines that treat rare diseases. Companies that develop them receive benefits including seven years of market exclusivity upon approval, as well as potential tax credits and grant funding and reduced filing fees.