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Biotech firm PTC Therapeutics said Wednesday that its drug for phenylketonuria, or PKU, met its key goal in a Phase 3 study.

In PKU, patients’ bodies are unable to break down the amino acid phenylalanine, resulting in intellectual disability, memory problems, and other neurological issues. In the 156-volunteer trial, the drug, sepiapterin, reduced levels of phenylalanine by 63% compared to a placebo, PTC said in a press release. The company did not release detailed results, but said that no severe adverse events occurred in the study.

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Brian Abrahams, an analyst at RBC Capital Markets, wrote that the results appear to meet high expectations that investors had for the drug. He’d previously said that a 40% to 50% reduction in phenylalanine, or “Phe,” levels would be clinically important.

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