Phase 2a Study of the Safety, Tolerability, and Pharmacokinetics of Topically Administered PRN473 (SAR444727) in Patients With Mild to Moderate Atopic Dermatitis

Completed · Phase 2 · Has a placebo group

Conditions studied: Atopic Dermatitis

In brief

This was a Ph2a study that consists of a double-blind, intra-patient placebo-controlled treatment period and an open-label uncontrolled treatment period with objective to evaluate the safety, tolerability, PK and preliminary efficacy of PRN473 in up to 40 patients with mild to moderate AD. On Day 1 (Baseline) of the Blinded Period, 2 target lesions with a difference no greater than 1 point in Total Sign Score (TSS) were randomly assigned to treatment in an intra-patient 1:1 manner, one lesion to PRN473 and the other to matching placebo. Participation took approximately 13 weeks, including up to a 5-week screening period, a 6-week treatment period, end of study assessments 1 day after last dose, and a safety follow-up phone call 2 weeks after last dose.

Key facts

Study ID: NCT04992546
Run by: Principia Biopharma, a Sanofi Company
People needed: 39
Starts: 2021-08-13
Expected to finish: 2022-12-28
Last updated by the study team: 2025-09-10

Who can join

Age: 18 and older, up to 70. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

Male and female adults 18 to 70 years of age (inclusive) at the time of informed consent.
Diagnosed with mild to moderate AD.
History of AD for at least 6 months as determined by the Investigator through patient interview.
Stable disease for the 4 weeks prior to the screening visit with no significant flares in AD as determined by the Investigator.
Validated Investigator Global Assessment-atopic dermatitis (vIGA-AD) score of Moderate or Mild at Screening. The vIGA-AD was evaluated for the entire body except scalp, palms, soles and genitals.
HadAD involvement (excluding scalp, palms, soles and genitals) of at least 1.0% BSA and no more than 14.0% BSA.
Had at least two target lesions 100 cm2 or greater with a difference no greater than 1 point in lesion TSS and at least 5 cm apart located on the trunk (excluding genitals) or upper extremities (excluding palms).
If female, patients with child-bearing potential must have a negative pregnancy test, and agree to practice true abstinence or agree to use highly effective contraception.
If male, agree to use a male condom and highly effective contraception with female partners of child-bearing potential.
In good health as judged by the Investigator.

You may not qualify if…

Patients who had failed 2 or more prior systemic treatments for AD.
Patients who had received a live or attenuated vaccine in the last 12 weeks or intend to receive a live or attenuated vaccine during the study.
Patients who cannot discontinue prohibited medications and treatments prior to the Baseline visit and during the study.
Has unstable AD, based on the judgement of the Investigator, or any consistent requirement for high potency topical steroids to manage AD signs or symptoms.
Patients who had significant active systemic or localized bacterial, viral, fungal, and helminth infection in the last 30 days.
Patients unwilling to refrain from prolonged sun exposure or use of a tanning bed or other artificial light emitting devices for 4 weeks prior to Baseline and during the study.
Patients with other skin conditions that would interfere with evaluations of the effect of the study medication on AD, as determined by the Investigator.
Patients with known genetic dermatological conditions that overlap with AD, such as Netherton syndrome.
Previous used of a BTK inhibitor.
Women who were pregnant, wishing to become pregnant during the study, or were breastfeeding.
Patients were undergoing allergy (eg, food allergy testing or skin prick testing), patch testing, or food challenges, or plan to do so during the study.
Patients who had undergone major surgery within 4 weeks prior to Day 1 or patients who had a major surgery planned during the study.
Regular use of drugs of abuse or regular alcohol consumption within 6 months prior to the study.

Where it is running

Collaborative Neuroscience Research-Site Number:8400004 — Long Beach, California, United States
California Allergy & Asthma Medical Group-Site Number:8400008 — Los Angeles, California, United States
Florida International Research Center-Site Number:8400017 — Miami, Florida, United States
Lenus Research & Medical Group-Site Number:8400006 — Sweetwater, Florida, United States
Clinical Research Trials of Florida, Inc-Site Number:8400013 — Tampa, Florida, United States
Remington Davis Inc-Site Number:8400012 — Columbus, Ohio, United States
J&S Studies-Site Number:8400015 — Bryan, Texas, United States
Center for Clinical Studies, LTD. LLP-Site Number:8400014 — Houston, Texas, United States
Progressive Clinical Research-Site Number:8400002 — San Antonio, Texas, United States
Investigational Site Number :1240008 — Hamilton, Ontario, Canada
Investigational Site Number :1240007 — London, Ontario, Canada
Investigational Site Number :1240002 — Québec, Canada

Full record on ClinicalTrials.gov

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