An experimental drug slowed the paralyzing march of amyotrophic lateral sclerosis, or Lou Gehrig’s disease, in a clinical trial, according to researchers who say the results are a fresh sign that recent insights into the condition may soon bring new medicines.

The drug’s maker, closely held Amylyx Pharmaceuticals Inc., is releasing only the barest outlines of the mid-stage trial for now, as researchers continue to analyze the results. The drug slowed the rate of ALS’s progression in patients as measured by a widely used scale,…

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