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Study identifier: NCT05476770 Synced from ClinicalTrials.gov · July 28, 2026
● Recruiting

Tagraxofusp in Pediatric Patients With Relapsed or Refractory CD123 Expressing Hematologic Malignancies

Condition: Hematologic Malignancy · AML · ALL  ·  Sponsor: Therapeutic Advances in Childhood Leukemia Consortium

PhasePhase 1
Planned participants54
Who can joinAll sexes, 1 Year to 21 Years
Healthy volunteersNo

About this study

Tagraxofusp is a protein-drug conjugate consisting of a diphtheria toxin redirected to target CD123 has been approved for treatment in pediatric and adult patients with blastic plasmacytoid dendritic cell neoplasm (BPDCN). This trial aims to examine the safety of this novel agent in pediatric patients with relapsed/refractory hematologic malignancies. The mechanism by which tagraxofusp kills cells is distinct from that of conventional chemotherapy. Tagraxofusp directly targets CD123 that is present on tumor cells, but is expressed at lower or levels or absent on normal hematopoietic stem cells. Tagraxofusp also utilizes a payload that is not cell cycle dependent, making it effective against both highly proliferative tumor cells and also quiescent tumor cells. The rationale for clinical development of tagraxofusp for pediatric patients with hematologic malignancies is based on the ubiquitous and high expression of CD123 on many of these diseases, as well as the highly potent preclinical activity and robust clinical responsiveness in adults observed to date. This trial includes two parts: a monotherapy phase and a combination chemotherapy phase. This design will provide further monotherapy safety data and confirm the FDA approved pediatric dose, as well as provide safety data when combined with chemotherapy. The goal of this study is to improve survival rates in children and young adults with relapsed hematological malignancies, determine the recommended phase 2 dose (RP2D)…

This description comes directly from the study's public registry record.

Talk to the study team

Benjamin N Brookhart  ·  323-361-5429  ·  bbrookhart@chla.usc.edu

Ellynore Florendo  ·  323-361-3022  ·  eflorendo@chla.usc.edu

Always discuss trial participation with your own doctor first.

Locations (31)

Children's Hospital Los AngelesLos Angeles, California, United StatesRecruiting
Children's Hospital Orange CountyOrange, California, United StatesNot Yet Recruiting
UCSF School of MedicineSan Francisco, California, United StatesRecruiting
Children's Hospital ColoradoDenver, Colorado, United StatesRecruiting
Children's National Medical CenterWashington D.C., District of Columbia, United StatesRecruiting
University of MiamiMiami, Florida, United StatesNot Yet Recruiting
Children's Healthcare of Atlanta, Emory UniversityAtlanta, Georgia, United StatesNot Yet Recruiting
Ann & Robert H. Lurie Children's Hospital of ChicagoChicago, Illinois, United StatesRecruiting
Riley Hospital for ChildrenIndianapolis, Indiana, United StatesRecruiting
Johns Hopkins UniversityBaltimore, Maryland, United StatesNot Yet Recruiting
National Cancer Institute, Pediatric Oncology BranchBethesda, Maryland, United StatesNot Yet Recruiting
Dana-Farber Cancer InstituteBoston, Massachusetts, United StatesNot Yet Recruiting

+ 19 more locations — full list on the registry record.

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Source record: clinicaltrials.gov/study/NCT05476770