We are disappointed with the failure of Osiris Therapeutics’ (
OSIR) Prochymal, a drug derived from human stem cell for the treatment of graft-versus-host disease (GvHD), the most common complication of bone marrow transplants. Currently, there is no approved treatment available for this life-threatening disease.
Based on the preliminary results of two phase III trials conducted by the company, Prochymal was found to be ineffective compared to placebo. Following the setback, Osiris shares fell by 34% to $8.03, their greatest single day decline since August 2006.
In the first trial, where the drug was used along with steroids, 45% of patients responded to the combination compared to 46% who responded to steroid along with a placebo. In the second trial, when Prochymal was used on patients not benefiting from steroids, it did not show statistically significant improvement. However, the drug did have a positive impact on patients with GvHD-affected
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