A Phase 2 Study of JNT-517 in Adolescent Participants With Phenylketonuria
The goal of this Phase 2, randomized study is to assess the safety, tolerability, and pharmacokinetics (PK) of oral JNT-517 in adolescents (12 to less than 18 years of age) with PKU. Participants will receive either JNT-517 or placebo and will be blinded to their treatment assignment. Participants will have a 4 in 5 (or 80%) chance of receiving JNT-517. The study will last for up to 63 days including a Screening period, Treatment period and Follow-up period for safety. Participants will: * Take 75 mg JNT-517 or a placebo BID (2x per day) for 28 days * Visit the clinic or have a mobile health nurse visit your home for checkups and tests * Collect urine sample at home and bring to clinic on specified days * Keep a food diary 3 days before each study visit
• Males and females 12 to less than 18 years of age, inclusive on Day 1.
• Clinical diagnosis of PKU.
• Ability to swallow tablets.
• Average of 2 plasma Phe levels during the Screening period greater than 360 μM and no plasma Phe level less than 300 μM.
• Body weight equal or greater than 45 kg and body mass index less than 40 kg/m2.
• Females of childbearing potential must practice sexual abstinence or agree to use 2 highly effective contraceptive methods.
• Capable of giving signed informed consent (emancipated minors) or parent/legal guardian to provide informed consent and the participant to give assent and confirm ability to comply with study procedures.