資料來源：https://www.reuters.com/article/us-ultragenyx-study-idUSKBN16T2WI

Ultragenyx Pharmaceutical Inc said its drug to treat patients with seizures did not meet the main goal in a mid-stage study, sending its shares down 6.2 percent in after-market trading on Wednesday.

The company said the study did not show statistical significance in reducing the frequency of seizures among patients treated with the drug compared to a placebo, during a eight week treatment period.

Ultragenyx's experimental treatment for mucopolysaccharidosis — a rare genetic, metabolic disorder when the body is unable to breakdown GAGs, a kind of complex carbohydrate — is in its late stage.

The company's other rare and ultra-rare disease treatments are in its mid-stages.

(Reporting by Akankshita Mukhopadhyay in Bengaluru; Editing by Shounak Dasgupta)