INDIANAPOLIS (AP) — A possible Alzheimer's disease treatment from drugmaker Eli Lilly showed some promise in late-stage research, even though the drug failed to slow a form of mental decline in two separate studies of patients with the mind-robbing condition.

Shares of the Lilly climbed Friday in morning trading after the Indianapolis company announced what could be a step toward a long-awaited breakthrough in the fight against a disease that has no cure and ultimately proves fatal. But Lilly officials cautioned that it's important not to overreact to their initial results.

Lilly said Friday its treatment, solanezumab, failed to slow cognitive decline, which involves a person's memory, in two late-stage studies of about 1,000 patients each. But when data from the trials were combined, scientists saw a statistically significant slowing of the rate of cognitive decline in the bigger population.

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