This is a A multicenter, open label, phase II clinical study to evaluate the safety, pharmacokinetics (PK), pharmacodynamics(PD), and preliminary efficacy of AK120 in adolescents with moderate-to-severe atopic dermatitis

This is a A multicenter, open label, phase II clinical study aimed to evaluate the safety, PK, PD, and preliminary efficacy of AK120 in adolescents with moderate-to-severe AD. The entire study include screening period(week -4 to week 0), treatment and follow-up period(16 weeks). The duration of the study is about 20 weeks.

Inclusion Criteria:

• Male or female subjects aged ≥12 <18 years old.
• Weight≥30kg at baseline.
• AD diagnosed at least half a year before screening.
• Subject with EASI score ≥16, IGA ≥ 3, BSA ≥ 10% at screening and baseline.

Exclusion Criteria:

• Acute onset of AD in 4 weeks prior to enrollment.
• Undergone or planned surgery during the study period within the 4 weeks prior to enrollment, or unable to fully recover from surgery before enrollment.
• Previously suffered from vernal keratoconjunctivitis (VKC) or atopic keratoconjunctivitis (AKC).
• Received systemic traditional Chinese medicine treatment within the 4 weeks before randomization or topical traditional Chinese medicine treatment within 1 week before randomization.
• Received treatment with other clinical study drugs within 1 month or 5 half-lives before randomization (whichever is longer).
• Have a history of allergies to any component of AK120 and/or severe allergic reactions to monoclonal antibodies.