A Phase I Study of HXN5003 in Healthy Participants and Patients With Moderate-to-Severe Atopic Dermatitis

NCT07801612 | Not Yet Recruiting Phase 1

• 1 other identifier: HXN5003-A1-102
• Study Type: interventional
• Target: 68
• Locations: 1 country
• Sites: 1

Brief Summary

This is a Phase I, multicenter, randomized, double-blind, placebo-controlled study evaluating HXN5003 in healthy participants and patients with moderate-to-severe atopic dermatitis (AD). The study consists of two parts: Part A (single ascending dose in healthy participants) and Part B (multiple ascending dose in AD patients). The primary objectives are to assess the safety, tolerability, pharmacokinetics (PK), immunogenicity, and preliminary efficacy of HXN5003.

Conditions

Health Adult Subjects; Moderate-to-Severe Atopic Dermatitis

Outcome Measures

Primary Outcomes (2)

• Part A Adverse events

  Incidence, severity, and causal relationship of Adverse Events (AEs)

  Up to day 197

• Part B Adverse Events

  Incidence, severity, and causal relationship of Adverse Events (AEs)

  Up to day 281

Study Arms (4)

Part A Single Ascending Dose (SAD)

EXPERIMENTAL

Healthy participants will receive a single subcutaneous dose of HXN5003

Drug: HXN5003

Part A Placebo (SAD)

PLACEBO COMPARATOR

Healthy participants will receive a single subcutaneous dose of placebo

Drug: Placebo

Part B Multiple Ascending Dose (MAD)

EXPERIMENTAL

AD participants will receive multiple subcutaneous doses of HXN5003

Drug: HXN5003

Part B Placebo (MAD)

PLACEBO COMPARATOR

AD participants will receive multiple subcutaneous doses of placebo

Drug: Placebo

Interventions

HXN5003 DRUG

Healthy participants will be enrolled sequentially into one of four ascending dose cohorts and will receive a single subcutaneous dose of HXN5003.

Part A Single Ascending Dose (SAD)

Placebo DRUG

Healthy participants will be enrolled sequentially into one of four ascending dose cohorts and will receive a single subcutaneous dose of placebo.

Part A Placebo (SAD)

Eligibility Criteria

• Age: 18 Years - 70 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Participants must be able to understand and comply with the study requirements and voluntarily sign the informed consent form (ICF).
• (Healthy Participants) Male or female participants aged 18 to 50 years (inclusive) at the time of signing the ICF.
• (Healthy Participants) Male participants weighing ≥ 50.0 kg and female participants weighing ≥ 45.0 kg, with a body mass index (BMI) between 19.0 and 26.0 kg/m² (inclusive).
• (Patients with AD) Male or female participants aged 18 to 70 years (inclusive)
• (Patients with AD) Participants must have documented AD history, moderate-to-severe disease, and inadequate response to topical therapy at screening.

You may not qualify if:

• Presence of any clinically significant disease at randomization, as judged by the investigator.
• History of severe drug allergy or systemic anaphylactic reactions, such as anaphylactic shock, laryngeal edema, etc.
• Known or suspected history of immunosuppression, or history of invasive opportunistic infections, including infections that are unusually frequent, recurrent, or prolonged in duration as judged by the investigator, even after resolution of the infection.
• Participants who have resided long-term in regions with high prevalence of Human Herpesvirus-8 (HHV-8), such as Africa or the Mediterranean coastal areas.
• History of malignancy or malignant disease, with the exception of surgically excised cutaneous squamous cell carcinoma in situ, basal cell carcinoma, and cervical carcinoma in situ that have been in complete remission for more than 5 years without any evidence of recurrence.
• Female participants who are breastfeeding or pregnant, or women of childbearing potential with a positive serum pregnancy test result at screening.
• Participants with a chronic active infection or a condition that would seriously interfere with study drug administration at baseline within 4 weeks prior to randomization; or a superficial skin infection requiring treatment within 1 week prior to randomization; or an acute illness within 48 hours prior to randomization.
• (Patients with AD) Other than AD, A history of clinically significant disease which is poorly controlled or could pose a safety risk to the participant or confound the safety assessment, as judged by the Investigator to compromise participant safety in the study.
• (Patients with AD) Positive results in any of the following infectious disease screening tests: 1）History of active tuberculosis, or positive result at screening (T-SPOT.TB or QuantiFERON-TB Gold); 2）Positive for hepatitis B; 3）Positive hepatitis C antibody; 4）Positive Treponema pallidum antibody; 5）History of HIV infection, or positive HIV antibody.

Sponsors & Collaborators

• Helixon Biotechnology (Suzhou) Co., Ltd: lead

Study Sites (1)

Affiliated Hangzhou First People's Hospital, School of Medicine, Westlake University

Hangzhou, Zhejiang, 310006, China

Location

Central Study Contacts

Tong Gang

CONTACT

(86)13918569690; tonggang@helixon.com

Study Design

• Study Type: interventional
• Phase: phase 1
• Allocation: RANDOMIZED
• Masking: TRIPLE
• Who Masked: PARTICIPANT, CARE PROVIDER, INVESTIGATOR
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: INDUSTRY
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: August 30, 2026
• First Posted: September 3, 2026
• Study Start: September 1, 2026
• Primary Completion (Estimated): October 1, 2027
• Study Completion (Estimated): January 1, 2028
• Last Updated: September 3, 2026

Record last verified: 2026-08

Data Sharing

• IPD Sharing: Will not share

Locations

CN (1)