UPDATE: Lilly shares fall after it changes goal for Alzheimer’s trial

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(Photo courtesy of Eli Lilly and Co.)

Shares in Eli Lilly and Co. fell Tuesday on concerns surrounding the potential approval of a drug designed to treat dementia caused by Alzheimer's disease.

The company said Tuesday it is changing the goal of a late-stage trial, and investors worried the change makes it less likely regulators will approve the drug.

The stock dropped $2.67, or 3.6 percent, to close at $71.24.

Indianapolis-based Lilly said it is making a change to the primary endpoint for the Phase 3 study of solanezumab, in people with mild Alzheimer's dementia. The Expedition3 trial had two primary outcome measures: changes in participants' cognition and their daily function. Now cognition will remain a primary outcome measure, while function will be a secondary measure of the drug's effectiveness.

Lilly said in a written statement it made the change because "emerging scientific evidence supports the idea that cognitive decline precedes and predicts functional decline" in Alzheimer's patients.

Late-stage studies usually are the last ones before drug developers seek regulatory approval.

Credit Suisse analyst Dr. Vamil Divan wrote to investors that the news adds to uncertainty over "what was already a high-risk program."

He added that he understands the rationale for making the change now and "for why the study should ultimately be positive." Divan wrote that he still sees a "path for the drug making it to the market."

If that happened, solanezumab would almost definitely generate billions in annual sales. That's because existing Alzheimer's drugs only alleviate symptoms temporarily, leaving doctors little to offer to help patients and their caregivers.

Solanuzumab works by clearing a substance called amyloid beta from the brain before it clumps together in the plaques that are the hallmark of the mind-robbing disorder. It's being studied to treat patients with very early Alzheimer's in hopes it would prevent that damage. Data released in July suggested that solanezumab could have a modest but lasting impact that slows the disease.

About 5.3 million Americans, most of them over 65, have Alzheimer's disease, which is the sixth-leading cause of death in the U.S., according to the Alzheimer's Association.

The number of Alzheimer's patients worldwide is now estimated at 47 million and is expected to jump to nearly 132 million by 2050.

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