First-in-human Study of SAR443579 Infusion in Male and Female Children and Adult Participants With Relapsed or Refractory Acute Myeloid Leukemia (R/R AML), B-cell Acute Lymphoblastic Leukemia (B-ALL), High Risk-myelodysplasia (HR-MDS), or Blastic Plasmacytoid Dendritic Cell Neoplasm (BPDCN)

An Open-label, First-in-human, Dose-escalation/Expansion Study of SAR443579 Administered as Single Agent by Intravenous Infusion in Adult and Pediatric Participants With Relapsed or Refractory Acute Myeloid Leukemia (R/R AML), B-cell Acute Lymphoblastic Leukemia (B-ALL), High Risk-myelodysplasia (HR-MDS), or Blastic Plasmacytoid Dendritic Cell Neoplasm (BPDCN)

This is an open-label, multicenter, Phase 1/Phase 2, dose escalation and dose expansion study to evaluate the safety, pharmacokinetics, pharmacodynamics and anti-leukemic activity of SAR443579 in various hematological malignancies.

Study Overview

• Status: Terminated
• Conditions: Myelodysplastic Syndromes; Acute Lymphocytic Leukaemia; Acute Myeloid Leukaemia Refractory; Blastic Plasmacytoid Dendritic Cell Neoplasia
• Intervention / Treatment: Drug: SAR443579

Detailed Description

Study duration per participant is 2.5 years.

• Study Type: Interventional
• Enrollment (Actual): 101
• Phase: Phase 2; Phase 1

Contacts and Locations

Study Locations

• Australia
  • Victoria
    • Melbourne, Victoria, Australia, 3000
      • Investigational Site Number :0360002
    • Melbourne, Victoria, Australia, 3004
      • Investigational Site Number :0360001
• China
  • Tianjin, China, 300020
    • Investigational Site Number : 1560001
  • Zhengzhou, China, 450008
    • Investigational Site Number : 1560003
• France
  • Marseille, France, 13009
    • Investigational Site Number :2500002
  • Paris, France, 75010
    • Investigational Site Number :2500001
  • Paris, France, 75019
    • Investigational Site Number : 2500004
  • Villejuif, France, 94800
    • Investigational Site Number :2500003
• Netherlands
  • Amsterdam, Netherlands, 1081 HV
    • Investigational Site Number :5280002
  • Groningen, Netherlands, 9713 GZ
    • Investigational Site Number :5280003
  • Nijmegen, Netherlands, 6525 GA
    • Investigational Site Number : 5280005
  • Rotterdam, Netherlands, 3015 CE
    • Investigational Site Number :5280001
  • Utrecht, Netherlands, 3584 CS
    • Investigational Site Number :5280004
• United States
  • California
    • Duarte, California, United States, 91010
      • City of Hope-Site Number:8400002
  • Georgia
    • Atlanta, Georgia, United States, 30303
      • Emory University School of Medicine- Grady Campus- Site Number : 8400006
  • Massachusetts
    • Boston, Massachusetts, United States, 02215
      • Beth Israel Deaconess Medical Center-Site Number:8400004
  • New York
    • New York, New York, United States, 10021
      • Weill Cornell Medical College-Site Number:8400003
    • The Bronx, New York, United States, 10461
      • Montefiore Hutchinson Campus- Site Number : 8400012
  • Ohio
    • Columbus, Ohio, United States, 43210
      • The Ohio State University- Site Number : 8400009
  • Oregon
    • Portland, Oregon, United States, 97239
      • Oregon Health and Science University-Site Number:8400011
  • Pennsylvania
    • Philadelphia, Pennsylvania, United States, 19104
      • The Children's Hospital of Philadelphia- Site Number : 8400013
  • Texas
    • Houston, Texas, United States, 77030
      • MD Anderson Cancer Center-Site Number:8400001
  • Washington
    • Seattle, Washington, United States, 98105
      • Seattle Children's Hospital- Site Number : 8400014

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 12 years and older (Child, Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Participant must be at least 1 year (for France: 2 years) old at the time the trial participant or legal guardian signs the informed consent form and will be assigned as follows:

  • Adult arm: aged at least 18 years old.
  • Pediatric arm: aged 1 (for France: 2 years) to less than 18 years old.

• Adult and Pediatric Arms: Escalation and Expansion/Optimization Cohorts A1, A2, C, D: Confirmed diagnosis of primary or secondary AML (any subtype) according to World Health Organization (WHO) 2022 classification. Participants with AML must meet one of the following criteria, a), b), c) or d) and are limited to those with no available (or are ineligible) therapy with known clinical benefit.

  a) Primary Induction Failure (PIF) AML, defined as disease refractory to one of the following, i or ii.

  i) An intensive induction attempt, per institution. Induction attempts include high-dose and/or standard-dose cytarabine ± an anthracyclines/anthracenedione ± an anti-metabolite, with or without growth factor or targeted therapy containing regimens.

ii) For adults who are age 75 years or older, or who have comorbidities that preclude use of intensive induction chemotherapy; PIF is defined as AML refractory to one of the following less intensive regimens, 1 or 2:

1. 4 cycles of hypomethylating agents (HMA) or

2. 2 cycles HMA + venetoclax b) Early relapse (ER) AML, defined as AML in relapse with CR, CRh or CRi duration less than 6 months on prior induction treatment c) Leukemia in first or higher relapse d) For participants aged 1 (for France: 2 years) to less than 18 years old, primary induction failure is defined as disease refractory after two cycles of induction therapy.

   • Adult Arm (Escalation and Expansion/Optimization Cohorts B and Japan Cohort C only): Confirmed diagnosis of MDS, meeting the following criteria:

     1. intermediate or high-risk category as per a Revised International Prognostic Scoring System (IPSS-R) AND
     2. confirmed CD123 + expression status determined by local institutional standards AND
     3. limited to those with no available (or are ineligible) therapy with known clinical benefit.
   • Pediatric arms escalation part and Japan Cohort C only: Confirmed diagnosis of CD123+ BALL without extramedullary lesions that have no available (or are ineligible) therapy with known clinical benefit. Participants with non-CNS chloromatous disease are not allowed in the study.
   • Body weight at least 10 kg.
   • Pediatric arm and escalation part only: Confirmed diagnosis of BPDCN according to World Health Organization (WHO) 2022 classification, who have relapsed or refractory disease with no available (or are ineligible) therapy with known clinical benefit.
   • Japan participants (Cohort C): Participant must be at least 18 years old at the time the trial participant signs the informed consent form

Exclusion Criteria:

• Eastern Cooperative Oncology Group (ECOG) performance status greater than 2 (at least 18 years-old). Karnofsky Scale (16 to 17 years-old) less than 50% or Lansky Scale (less than 16 years-old) less than 50%.
• Ongoing or recent (within 5 years) evidence of significant autoimmune disease that requires or required treatment with systemic immunosuppressive treatments, which may suggest a risk for immune-related adverse events. The following are not exclusionary: vitiligo, childhood asthma that has resolved, residual hypothyroidism that required only hormone replacement or psoriasis that does not require systemic treatment.
• History of an invasive malignancy within the last 3 years prior to first IMP administration that requires active therapy (adjuvant hormonal therapy is allowed) other than the one treated in this study.
• Evidence of active central nervous system leukemia at the time of enrollment as evidenced by cytology or pathology. Except for participants aged 1 (for France: 2 years) to less than 18 years, central nervous system 1 disease (CNS1) and CNS2 disease are allowed.
• Known acquired immunodeficiency syndrome (AIDS-related illnesses) or human immunodeficiency virus (HIV) disease requiring antiretroviral treatment, or having active hepatitis B or C infection, or severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection.
• Prior treatment with an anti-CD123-directed agent (except for participants with BPDCN in the pediatric arm).
• Prior HSCT with relapse beyond 3 months or prior CAR-T therapy in B-ALL with relapse beyond 2 months may be included only if off immunosuppression for a minimum of 4 weeks and no evidence of GVHD.
• Receiving at the time of first investigational medicinal product (IMP) administration corticosteroid as a concomitant medication with corticosteroid dose more than 10 mg/day of oral prednisone or the equivalent.
• AML, BPDCN, or HR-MDS participants with prior treatment with cellular therapy, eg, chimeric antigen receptor T cell (CAR-T) or chimeric antigen receptor NK cell (CAR-NK). Prior CAR-T therapy is allowed for participants with B-ALL.
• Concurrent treatment with other investigational drugs.
• Pregnant and breast-feeding women.
• History of solid organ transplant, including corneal transplant.
• Average QTc (using the Fridericia correction calculation) greater than 470 millisecond (msec) at screening.
• Pediatric arm only: Participants with known inherited bone marrow failure syndromes (e.g., bloom syndrome, ataxia-telangiectasia, Fanconi anemia, Kostmann syndrome, Shwachman syndrome). Participants with Down syndrome with adequate organ function as per Investigator discretion are allowed to participate in the study.
• Adult arm Expansion/Optimization- Participants with MDS evolving from a pre-existing myeloproliferative neoplasm (MPN), MDS/MPN including chronic myelomonocytic leukemia (CMML), atypical chronic myeloid leukemia (aCML), unclassifiable MDS/MPN and therapy-related MDS (t-MDS).
• Confirmed diagnosis of acute promyelocytic leukemia (APL) or juvenile myelomonocytic leukemia (JMML) according to WHO 2022 classification.

The above information is not intended to contain all considerations relevant to a potential participation in a clinical trial.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: SAR443579; Dose Escalation: SAR443579 administered intravenously at escalating dose levels. Dose Expansion: SAR443579 administered intravenously at the recommended dose and schedule determined from the dose escalation.	Drug: SAR443579; Powder for solution for infusion; by IV infusion

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Escalation Part: Incidence of dose-limiting toxicity (DLT)	DLTs encompass both hematologic and nonhematologic toxicities, prespecified adverse reactions observed post-administration of SAR443579 and assessed by both the investigator and the sponsor.	Day 1 to Day 28
Japan Cohort C: Incidence of DLT in Japanese participants	DLTs encompass both hematologic and nonhematologic toxicities, prespecified adverse reactions observed post-administration of SAR443579 and assessed by both the investigator and the sponsor.	Day 1 to Day 28
Expansion/Optimization part (Cohorts A1, A2 & D), AML: Proportion of participants who have a CR + CRh + CRi according to the modified AML IWG 2003 criteria	Measure of clinical response to treatment: Proportion of participants who have a complete remission (CR) + CR with partial hematologic recovery (CRh) + CR with incomplete hematologic recovery (CRi) according to the modified acute myeloid leukemia (AML) IWG 2003 criteria.	Up to 6 months
Expansion/Optimization part (Cohort B), MDS: Overall response rate (CR + CR equivalent + PR + CRL + CRh + HI) according to the IWG 2023 MDS response criteria	Measure of clinical response to treatment: Overall response rate (CR + CR equivalent + partial remission (PR) + CR with limited count recovery (CRL) + CRh + hematologic improvement (HI)) according to the International Working Group (IWG) 2023 myelodysplasia (MDS) response criteria.	Up to 6 months

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Expansion/Optimization part - Cohorts A, B and D: Recommended dose for expansion (RDE)	Recommended dose for expansion (RDE) of SAR443579.	Up to 12 months
Escalation and Expansion/Optimization parts - Cohorts A, B, C and D: Number of participants with TEAEs	Number of participants with treatment-emergent adverse events (TEAEs).	Up to 30 months
Escalation and Expansion/Optimization parts - Japan Cohort C, AML: Rate of CR + CRh + CRi per AML 2003 modified IWG response criteria	Measure of clinical response to treatment.	Up to 6 months
Escalation and expansion/Optimization parts - Japan Cohort C, MDS: CR rate and ORR rate per IWG 2023 MDS response criteria for escalation part and ORR rate per IWG 2023	Measure of clinical response to treatment.	Up to 6 months
Escalation and Expansion/Optimization parts - Japan Cohort C, B-ALL: Rate of CR + CRh + CRi as defined by National Comprehensive Cancer Network (NCCN)	Measure of clinical response to treatment.	Up to 6 months
Expansion/Optimization part - Cohorts A and D: Overall response rate (ORR)	Measure of clinical response to treatment.	Up to 6 months
Expansion/Optimization part - Cohorts A and D: Duration of CR + CRh + CRi (Duration of CRc)	Measure the length of clinical response to treatment.	Up to 30 months
Expansion/Optimization part - Cohorts A and D: Duration of CR + CRi + CRh + PR + MLFS (Duration of overall response rate)	Measure the length of clinical response to treatment.	Up to 30 months
Expansion/Optimization part - Cohorts A and D: Alternative CR rate	Measure of clinical response to treatment.	Up to 6 months
Expansion/Optimization part - Cohorts A and D: Duration of CR + CRh (Duration of alternative CR)	Measure the length of clinical response to treatment.	Up to 30 months
Expansion/Optimization part - Cohorts A and D: Event-free survival (EFS)	EFS is defined as the time interval from the first day of treatment assignment to the date of earliest evidence of relapse, treatment failure, or death.	Up to 6 months
Expansion/Optimization part - Cohorts A and D: Overall survival (OS)	OS is defined as time interval from the first day of treatment assignment to death from any cause.	Up to 30 months
Expansion/Optimization part - Cohorts A and D: Rate of hematopoietic stem cell transplantation (HSCT)	Rate of HSCT procedures immediately following study treatment administration but prior to subsequent therapy for treatment of AML.	Up to 30 months
Expansion/Optimization part - Cohorts A and D: Time to treatment failure (TTF)	TTF is defined as the time from first day of treatment assignment to discontinuation for any reason excluding remission, eg, relapsed disease, refractory disease, unacceptable AE, participant preference or death.	Up to 6 months
Expansion/Optimization part - Cohorts A and D: Rate of conversion from transfusion dependence	Rate of conversion from transfusion dependence during 56-day post-baseline period.	Day 0 to Day 56
Expansion/Optimization part - Cohorts A and D: Rate of participants who are transfusion independent at baseline and remain independent during 56-day postbaseline period	Rate of participants who are transfusion independent at baseline and remain independent during 56-day postbaseline period.	Day 0 to Day 56
Expansion/Optimization part - Cohort B: Alternative CR rate	Alternative CR rate defined as proportion of participants with CR, CR equivalent, CRuni, CRbi, and CRh.	Up to 6 months
Expansion/Optimization part - Cohort B: Duration of ORR	The time interval from the first documented evidence of CR, CR equivalent, CRL, CRh, PR or HI to PD or relapse from CR, CR equivalent, CRL, CRh, PR or HI as per 2023 IWG recommendations or death due to any cause, whichever comes first.	Up to 30 months
Expansion/Optimization part - Cohort B: Event-free survival (EFS)	EFS is defined as the time interval from the first day of treatment assignment to the date of protocol specified events.	Up to 30 months
Expansion/Optimization part - Cohort B: Overall survival (OS)	OS is defined as time interval from the first day of treatment assignment to death from any cause.	Up to 30 months
Expansion/Optimization part - Cohort B: Rate of hematopoietic stem cell transplantation (HSCT)	Rate of HSCT procedures immediately following study treatment administration but prior to subsequent therapy.	Up to 30 months
Expansion/Optimization part - Cohort B: Time to treatment failure (TTF)	TTF is defined as the time interval from first day of treatment assignment to discontinuation for any reason excluding remission, eg, relapsed disease, disease progression, unacceptable AE, participant preference or death.	Up to 30 months
Expansion/Optimization part - Cohort B: Duration of alternative CR (CR + CR equivalent + CRL + CRh)	Measure the length of clinical response to treatment.	Up to 30 months
Expansion/Optimization part - Cohort B: Progression free survival (PFS)	The time interval from the first day of treatment assignment to the date of PD, relapse from CR (or CR equivalent), PR, CRL, CRh, or HI, death due to any cause, whichever comes first.	Up to 30 months
Cohorts A, B, C and D: Ctrough at Cycle 1	Concentration observed just before treatment administration during repeated dosing (Ctrough).	Cycle 1 from Day 1 to Day 28
Cohorts A, B, C and D: Incidence of ADA	Percentage of participants with anti-drug antibody (ADA) against SAR443579.	Up to 30 months

Collaborators and Investigators

• Sponsor: Sanofi
• Investigators: Study Director: Clinical Sciences & Operations, Sanofi

Publications and helpful links

Helpful Links

• TCD17197 Plain Language Results Summary

Study record dates

Study Major Dates

• Study Start (Actual): December 8, 2021
• Primary Completion (Actual): June 13, 2025
• Study Completion (Actual): June 13, 2025

Study Registration Dates

• First Submitted: October 19, 2021
• First Submitted That Met QC Criteria: October 19, 2021
• First Posted (Actual): October 20, 2021

Study Record Updates

• Last Update Posted (Estimated): December 15, 2025
• Last Update Submitted That Met QC Criteria: December 9, 2025
• Last Verified: December 1, 2025

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Neoplasms; Immune System Diseases; Neoplasms by Histologic Type; Hematologic Diseases; Lymphatic Diseases; Lymphoproliferative Disorders; Immunoproliferative Disorders; Bone Marrow Diseases; Leukemia, Lymphoid; Leukemia; Hemic and Lymphatic Diseases; Precursor Cell Lymphoblastic Leukemia-Lymphoma; Myelodysplastic Syndromes
• Other Study ID Numbers: TCD17197; U1111-1266-7399 (Registry Identifier: ICTRP); 2021-004287-98 (EudraCT Number); 2023-508357-58 (Registry Identifier: CTIS)

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: YES
• IPD Plan Description: Qualified researchers may request access to patient level data and related study documents including the clinical study report, study protocol with any amendments, blank case report form, statistical analysis plan, and dataset specifications. Patient level data will be anonymized and study documents will be redacted to protect the privacy of trial participants. Further details on Sanofi's data sharing criteria, eligible studies, and process for requesting access can be found at: https://vivli.org

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No