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A young boy died in a trial for Pfizer’s experimental gene therapy for Duchenne muscular dystrophy, the company told patient advocates Tuesday.

The boy was enrolled in Daylight, a trial studying the treatment in boys aged 2 or 3. The boy had received the therapy early last year, Pfizer told the advocates in a note posted online by Parent Project Muscular Dystrophy.

Pfizer said the boy died of cardiac arrest, but that it was still working to understand what happened and the exact cause.

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