Efficacy and Safety Study of Mavorixafor in Participants With Warts, Hypogammaglobulinemia, Infections, and Myelokathexis (WHIM) Syndrome
WHIM Syndrome
About this trial
This is an interventional treatment trial for WHIM Syndrome
Eligibility Criteria
Inclusion Criteria for the Randomized Placebo-Controlled Period :
- Have signed the current approved informed consent form. Participants under 18 years of age (in the Netherlands and other applicable regions, participants under 16 years of age) will sign an approved informed assent form and must also have a signed parental/legal guardian consent.
- Have a genotype-confirmed mutation of chemokine (C-X-C motif) receptor 4 (CXCR4) consistent with WHIM phenotype.
- Agree to use a highly effective form of contraception.
- Be willing and able to comply with the protocol.
- Have confirmed ANC ≤400 cells/µL during screening, obtained while participant has no clinical evidence of infection.
Inclusion Criteria for the Open-Label Period:
- Completed the Randomized Period; or
- Granted Early Release from the Randomized Period.
Exclusion Criteria:
- Has known systemic hypersensitivity to the mavorixafor drug substance, its inactive ingredients, or the placebo.
- Is pregnant or breastfeeding.
- Has any medical or personal condition, which in the opinion of the Investigator may potentially compromise the safety or compliance of the participant or may preclude the participant's successful completion of the clinical study.
Sites / Locations
- University of California San Diego Health/Rady Children's Hospital
- California Dermatology Institute
- University of Iowa
- Johns Hopkins University Medical Center
- University of Texas Southwestern Medical Center
- University of Washington Medical Center
- Wesley Hospital
- Children's Health Queensland Hospital
- Medical University of Vienna - Medizinische Universität Wien
- Aarhus University Hospital
- CHU de Lyon, Institut d'Hematologie et d'Oncologie Pediatrique
- CHU Paris Est, Hôpital d'Enfants Armand-Trousseau
- Hopital Necker-Enfants Malades
- University of Debrecen, Affiliated Department of Infectology
- HaEmek Medical Center
- Università degli Studi di Brescia, Scienze Cliniche e Sperimentali
- Seoul National University Hospital, Children's Hospital
- Emma Children's Hospital Academic Medical Center (AMC)
- Dmitry Rogachev National Research Center of Pediatric Hematology, Oncology and Immunology
- Academician I.P. Pavlov First Saint Petersburg State Medical University
- Hospital Sant Joan de Deu Barcelona
- Hospital Universitario Virgen del Rocío
- Cukurova University Faculty of Medicine
Arms of the Study
Arm 1
Arm 2
Experimental
Placebo Comparator
Mavorixafor
Placebo
Participants (adults and adolescents [12 to 17 years of age weighing >50 kilograms [kg]) will receive mavorixafor 400 milligrams (mg) once daily (QD) orally for 52 weeks in the Randomized Placebo-Controlled Period. Adolescents weighing ≤50 kg will receive mavorixafor 200 mg QD. Participants who complete the Randomized Placebo-Controlled Period or are granted Early Release due to recurrent or significant infections, as adjudicated by a blinded, independent adjudication committee (AC), will be offered the opportunity to enroll in the Open-Label Period and receive treatment with mavorixafor 400 mg once daily orally until commercial availability or study termination by the Sponsor.
Participants will receive placebo matching to mavorixafor QD orally for 52 weeks in the Randomized Placebo-Controlled Period. Participants who complete the Randomized Placebo-Controlled Period or are granted Early Release due to recurrent or significant infections, as adjudicated by a blinded, independent AC, will be offered the opportunity to enroll in the Open-Label Period and receive treatment with mavorixafor 400 mg once daily orally until commercial availability or study termination by the Sponsor.