Alzheimer's researchers met with disappointment Monday when officials from Pfizer announced that the experimental drug bapineuzumab failed to improve dementia symptoms in a Phase 3 trial.
Lead investigator Reisa Sperling, M.D., told the New York Times that the experimental drug showed “no evidence at all of a clinical benefit of treatment on either of the primary measures, one cognitive and one functional,†compared to placebo. Three drug makers were jointly developing bapineuzumab: Pfizer, Elan and Johnson & Johnson
Scientists told the paper that bapineuzumab's failure, in addition to other recent drug failures, has raised doubts about whether beta- amyloid plaques â€" proteins in the brain that have been targeted by drug developers â€" are implicated in the progressive disease.
Earlier trials suggested that bapineuzumab is more successful in Alzheimer's patients a specific gene, called ApoE4, which raises the risk a person will get Alzheimer's disease and can make the disease worse. Trial results testing bapineuzumab in this population will conclude within the next couple months, according to the paper.
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