NCT07225569 · Sanofi
A Study to Investigate Efficacy and Safety With SAR445399 in Adult Participants With Moderate to Severe Hidradenitis Suppurativa
(CLAROS)
What this study is about
This is a multinational, randomly assigned, where neither patients nor doctors know which treatment is given, compared against an inactive treatment, Phase 2, dose finding study to evaluate the effectiveness and safety of different doses of SAR445399 in adult participants with moderate to severe hidradenitis suppurativa.
View original scientific description
This is a multinational, randomized, double-blind, placebo-controlled, Phase 2, dose finding study to evaluate the efficacy and safety of different doses of SAR445399 in adult participants with moderate to severe hidradenitis suppurativa. The purpose of this study is to assess the efficacy and safety of two doses of SAR445399 compared with placebo in adult participants with moderate to severe hidradenitis suppurativa. The study duration (per participant) will be up to 46 weeks with a total of 16 visits. The treatment duration will be 32 weeks which includes 16-week double-blinded initial treatment period and a 16-week treatment-blinded extension period.
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Participants are eligible to be included in the study only if all of the following criteria apply:
- Participants with a history of signs and symptoms consistent with hidradenitis suppurativa (HS) for at least 6 months prior to Baseline
- Participants must have HS lesions present in at least 2 distinct anatomic areas (eg, left, and right axilla; or left axilla and left inguino-crural fold), with at least 1 body site being Hurley Stage II or III.
- Participant must have a total abscess and inflammatory nodule (AN) count of ≥5 at the Baseline Visit.
- Participant must have had an inadequate response to a trial of an oral antibiotic for treatment of HS, exhibited recurrence after discontinuation of antibiotics or demonstrated intolerance to antibiotics or has a contraindication to oral antibiotics for treatment of their HS as assessed by the Investigator through participant interview and review of medical history.
- Participants in the biologic-naïve stratum must be naïve to any prior use of biologic therapy with a potential impact on HS; Participants in the biologic-experienced stratum must have documented history of use of at least one dose of biologic therapy for HS.
Exclusion criteria
- Participants are excluded from the study if any of the following criteria apply:
- Any other active skin disease or condition (eg, bacterial, fungal, or viral infection) that may interfere with assessment of HS.
- History of recurrent or recent serious infection
- Known history of or suspected current immunosuppression
- History of solid organ transplant or stem cell transplant.
- History of splenectomy
- History of malignancy or lymphoproliferative disease other than adequately treated or nonmetastatic squamous cell carcinoma of the skin that was excised and completely cured or nonmetastatic basal cell carcinoma of the skin that was excised and completely cured.
- Any other medical condition or severe, concomitant illness, including psychiatric illness and substance abuse, that may present an unreasonable risk to the study participants, make participants unreliable or may interfere with study assessments The above information is not intended to contain all considerations relevant to a participant's potential participation in a clinical trial.
Where
- Scottsdale, Arizona
- North Hollywood, California
- Boynton Beach, Florida
- Fort Lauderdale, Florida
- Fort Myers, Florida
- Hollywood, Florida
- Miami, Florida
- Tampa, Florida
- Cumming, Georgia
- Fayetteville, Georgia
- Overland Park, Kansas
- Louisville, Kentucky
And 2 more locations — see the full list below.
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Jul 1, 2026 · Source of record for eligibility and locations