INDIANAPOLIS (AP) — Eli Lilly’s experimental Alzheimer’s drug has flashed potential to help with mild cases of the disease, but patients and doctors will have to wait a few more years to learn whether regulators will allow the drugmaker to sell it.

Lilly said Wednesday that it will launch another late-stage study of the drug, solanezumab, no later than next year’s third quarter. The company’s stock slipped in midday trading.