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1995Scientists at Diacrin, Inc. receive FDA permission to begin clinical trials using fetal pig neurons to treat patients suffering from Parkinson's disease. These Phase 1 trials when concluded show efficacy and no safety problems, leading to Phase 2 trials in the late 1990s.
March 2001Preliminary analysis of Phase 2 controlled trials treating Parkinson's disease patients with injected pig neuro cells indicate a setback. Although there were improvements, the study found no difference in the improvements between the patients who had been treated with the pig cells and those who had a placebo treatment.