Study of MP0533 in Patients Acute Myeloid Leukemia or Myelodysplastic Syndrome

Phase 1

Recruiting

• Conditions: Leukemia; Newly Diagnosed; Myeloid; Acute
• Interventions: Drug: MP0533 (multispecific DARPin CD3 Engager Targeting CD33, CD123 and CD70) monotherapy, Part 1; Drug: MP0533 with Obinutuzumab pretreatment; Drug: MP0533 + azacitidine + venetoclax with optional Obinutuzumab pretreatment, Arm B in treatment naïve patients; Drug: MP0533 (multispecific DARPin CD3 Engager Targeting CD33, CD123 and CD70) monotherapy, Part 2-Arm A; Drug: MP0533 (multispecific DARPin CD3 Engager Targeting CD33, CD123 and CD70) + azacitidine + venetoclax; Drug: MP0533 + azacitidine + venetoclax with optional Obinutuzumab pretreatment, Arm B relapsed/refractory AML

• Registration Number: NCT05673057
• Lead Sponsor: Molecular Partners AG

Brief Summary

The purpose of this study is to evaluate the safety, tolerability, and preliminary activity of MP0533 in patients with acute myeloid leukemia (AML) or myelodysplastic syndrome (MDS)

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2022-12-14
• Study Start: 2022-12-29
• Study First Submitted QC: 2023-01-04
• Study First Posted: 2023-01-06
• Status Verified: 2025-06
• Last Update Submitted: 2025-06-02
• Last Update Posted: 2025-06-05
• Primary Completion: 2027-12
• Study Completion: 2029-12

Recruitment & Eligibility

• Status: RECRUITING
• Sex: All
• Target Recruitment: 249

Inclusion Criteria

• Has signed and dated written informed consent prior to performing any study procedure, including screening
• Diagnosis of relapsed/refractory AML or relapsed/refractory MDS/AML according to the ELN recommendation 2022.
• Age ≥18 years old on the day of signing informed consent
• Eastern Cooperative Oncology Group (ECOG) performance status (PS) 0 to 2
• Anticipated life expectancy ≥ 12 weeks by investigator judgement
• White blood count (WBC) ≤ 15G/L at day of trial drug infusion
• Adequate renal and hepatic function
• Is using highly effective contraception, for females of childbearing potential and for men

Exclusion Criteria

• Mixed phenotype acute leukemia
• Patients with favorable AML mutations according to ELN recommendation 2022 and 2024
• Allogeneic HCT within the last 3 months and/or eligibility for standard 2nd line of targeted therapy, like gilteritinib for FLT3 mutated AML, unless this therapeutic option has already been given and proven ineffective (patient relapsed or resistant to), or contraindicated, or confounding mutations exist, or there is a lack of access to this recommended therapy.
• More than 2 prior lines of anti-leukemic therapy
• Active GvHD requiring immune-suppressive therapy
• Use of immunosuppressive drugs
• Clinical signs of AML in the central nervous system
• Major surgery within 28 days prior to start of study medication
• Other malignancy requiring active therapy, but adjuvant endocrine therapy is allowed
• Any uncontrolled active infection
• Treatment with investigational agents or agents targeting CD33, CD123 or CD70 within 4 weeks or five times the half-life of the agent, whichever is longer, prior to start of trial medication
• Left ventricular ejection fraction of < 50% on echocardiographic exam at screening
• History or evidence of clinically significant cardiovascular disease
• Pulmonary disease with clinically relevant hypoxia
• Active hepatitis
• Concurrent enrolment in another clinical trial, unless it is an observational (non-interventional) study or it is the follow-up period of an interventional study
• Known hypersensitivity to any of the excipients of the investigational medicinal product (IMP), i.e. finished MP0533 drug

Dose Expansion Group (Arm B in treatment-naïve patients only):

Inclusion

• Treatment-naïve patients who are eligible to AZA+VEN as standard of care

Dose Escalation and Expansion Groups (Arm B only):

Exclusion

1. received VEN in prior treatment lines
2. received strong and/or moderate CYP3A inducers within 7 days before the initiation of AZA/VEN regimen;
3. Has consumed grapefruit, grapefruit products, Seville oranges or Starfruit within 3 days before the initiation of AZA/VEN regimen;
4. Has a malabsorption syndrome or other condition that precludes the enteral route of administration of VEN.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SEQUENTIAL

Arm && Interventions

Group	Intervention	Description
Dose escalation (Part 1)	MP0533 (multispecific DARPin CD3 Engager Targeting CD33, CD123 and CD70) monotherapy, Part 1	• MP0533 is administered by intravenous infusion
Dose expansion (Arm A)	MP0533 with Obinutuzumab pretreatment	* MP0533 is administered by intravenous infusion at densified dosing schedule * Obinutuzumab pretreatment administered
Dose expansion (Arm B relapsed/refractory AML)	MP0533 + azacitidine + venetoclax with optional Obinutuzumab pretreatment, Arm B in treatment naïve patients	* MP0533 is administered by intravenous infusion * Azacitidine is administered by subcutaneous injection for 7 days per cycle * Venetoclax is administered orally for 14 days per cycle * Optional Obinutuzumab pretreatment administered
Dose escalation (Part 2 - Arm A)	MP0533 (multispecific DARPin CD3 Engager Targeting CD33, CD123 and CD70) monotherapy, Part 2-Arm A	* MP0533 is administered by intravenous infusion * Obinutuzumab pretreatment administered
Dose escalation (Part 2 - Arm B)	MP0533 (multispecific DARPin CD3 Engager Targeting CD33, CD123 and CD70) + azacitidine + venetoclax	* MP0533 is administered by intravenous infusion * Azacitidine is administered by subcutaneous injection for 7 days per cycle * Venetoclax is administered orally for 14 days per cycle * Optional Obinutuzumab pretreatment administered
Dose expansion (Arm B in treatment naïve patients)	MP0533 + azacitidine + venetoclax with optional Obinutuzumab pretreatment, Arm B relapsed/refractory AML	* MP0533 is administered by intravenous infusion * Azacitidine is administered by subcutaneous injection for 7 days per cycle * Venetoclax is administered orally for 14 days per cycle * Optional obinutuzumab pretreatment administered

Primary Outcome Measures

Name	Time	Method
Phase 1 dose escalation: Recommended Phase 2 Dose Regimen and/or Maximum Tolerated Dose Regimen	from start of treatment to end of first cycle (day 1 - 28)	Incidence of dose limiting toxicities, assessment of toxicity/safety, pharmacokinetic and efficacy parameters
Phase 2 dose extension: Overall Response Rate	throughout the study (on average 3 months)	Best overall response of complete remission (CR), complete remission with partial hematological recovery (CRh), complete remission with incomplete hematological recovery (CRi), morphologic leukemia-free state (MLFS) and partial remission (PR) according to the European LeukemiaNet (ELN) response criteria 2022

Secondary Outcome Measures

Name	Time	Method
Serum Concentration-time profiles (at Cmax (Tmax))	throughout the study (on average 1 year)	Determination of PK parameters including (but not limited to) time at Cmax (Tmax)
Volume of distribution (Vd)	throughout the study (on average 1 year)	PK analysis of MP0533
Event free survival (EFS)	throughout the study (on average 1 year)	time from the date of first study treatment administration to the date of treatment failure, hematologic relapse from CR/CRh/CRi or death from any cause
Duration of response (DoR)	throughout the study (on average 1 year)	time from the start date of CR, CRh, CRi, MLFS or PR to relapse or death
Overall survival (OS)	throughout the study (up to 3 years)	time from the date of first study treatment administration to the date of death
Transfusion-Independence (TI)	throughout the study (on average 1 year)	portion of subjects who achieved RBC/platelet transfusion independence post baseline
Number of patients proceeding to a stem cell transplantation	throughout the study (on average 1 year)	Number of patients proceeding to a stem cell transplantation
Serum Concentration-time profiles (max. serum)	throughout the study (on average 1 year)	Determination of PK parameters including (but not limited to) maximum serum concentration (Cmax)
Serum Concentration-time profiles (min. serum concentration)	throughout the study (on average 1 year)	Determination of PK parameters including (but not limited to) minimal serum concentration (Cmin)
Area under the concentration-time curve (AUC)	throughout the study (on average 1 year)	Pharmacokinetic (PK) analysis of MP0533
Total Clearance (CL)	throughout the study (on average 1 year)	PK analysis of MP0533
Half-life (t1/2)	throughout the study (on average 1 year)	PK analysis of MP0533
Incidence of adverse events (AEs) as a measure of safety	throughout the study (on average 1 year)	Type, incidence and severity of AEs according to National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) v5.0

Trial Locations

Locations (9)

CHU Bordeaux; 🇫🇷 Bordeaux, France

AP-HP Hôpital Saint-Louis; 🇫🇷 Paris, France

IUCT Oncopole; 🇫🇷 Toulouse, France

Vilnius University Hospital Santaros Klinikos; 🇱🇹 Vilnius, Lithuania

Amsterdam UMC - Locatie VUmc; 🇳🇱 Amsterdam, Netherlands

Groningen UMC; 🇳🇱 Groningen, Netherlands

Erasmus MC; 🇳🇱 Rotterdam, Netherlands

Inselspital, Universitaetsspital Bern; 🇨🇭 Bern, Switzerland

Universitaetsspital Zuerich; 🇨🇭 Zuerich, Switzerland