BEBT-908 Plus Chemotherapy Treatment for CR MRD-Positive MEF2D-Rearranged and Pre-B Acute Lymphoblastic Leukemia Patients

A Prospective Study of BEBT-908 in Combination With Chemotherapy for Patients With MEF2D-Rearranged and Pre-B Acute Lymphoblastic Leukemia in Complete Remission With Minimal Residual Disease Positivity

This investigator-initiated, prospective, single-arm, multicenter clinical trial aims to evaluate the efficacy and safety of BEBT-908 (a HDAC/PI3Kα inhibitor provided by BeBetter Med Inc ,Guangzhou, China) combined with chemotherapy in patients with MEF2D-rearranged and pre-B acute lymphoblastic leukemia who are in complete remission (CR) but remain minimal residual disease (MRD) positive.

Study Overview

• Status: Not yet recruiting
• Conditions: Acute Lymphoblastic Leukemia
• Intervention / Treatment: Drug: BEBT-908; Drug: Cyclophosphamide; Drug: Vincristine; Drug: Dexamethasone; Drug: Methotrexate; Drug: Cytarabine

Detailed Description

MEF2D-rearranged and pre-B acute lymphoblastic leukemia patients achieving CR after chemotherapy and have MRD+ will be given BEBT-908 (12.3 mg/m2) combined with Mini-Hyper-CVD and Mini-MTX/Ara-C chemotherapy for two cycles.

After two cycles, If MRD negativity is achieved and the patient is eligible for transplantation, hematopoietic stem cell transplantation will be performed; if MRD negativity is achieved but the patient is not suitable for transplantation, an additional six courses of BEBT-908-based combination chemotherapy will be given. Patients who fail to reach MRD negativity will be withdrawn from the study.

A total of 23 patients will be enrolled

• Study Type: Interventional
• Enrollment (Estimated): 23
• Phase: Phase 2

Contacts and Locations

• Study Contact: Name: Ming Zhang, PhD; Phone Number: +86 15000087380; Email: memoryzm91@163.com

Study Locations

• China
  • Shanghai Municipality
    • Shanghai, Shanghai Municipality, China, 200025
      • Ruijin Hospital, Shanghai JiaoTong University School of Medicine
      • Contact: Jin Wang, PhD; Phone Number: +86 13524945202; Email: jinwang@shsmu.edu.cn

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

1. The subject voluntarily agrees to participate in this trial and signs the informed consent form, and is able to understand and comply with all study requirements;
2. Age between ≥18 and ≤75 years at screening, with no gender restrictions;
3. Meets the diagnostic criteria for BCP-ALL (according to the 2022 WHO classification) and fulfills any one of the following conditions:

1) Positive for MEF2D rearrangement 2) Philadelphia chromosome negative and consistent with a Pre-B immunophenotype (according to the EGIL 1995 immunophenotyping criteria, cytoplasmic IgM+); 4. Diagnosed with BCP-ALL in complete remission but with positive minimal residual disease (MRD), defined as: achieving hematologic complete remission (CR) after treatment (bone marrow blast count <5% by morphology) but with positive MRD (MRD ≥10-⁴, as detected by flow cytometry and/or PCR); 5. ECOG performance status score of 0-2 at screening; 6. Expected survival is more than 3 months. 7. Satisfactory organ function, meeting the following criteria:

1. Serum creatinine ≤1.5 times the upper limit of normal（ULN）；
2. Left ventricular ejection fraction (LVEF) >50%; 3）Total bilirubin ≤2 times ULN；Alanine aminotransferase (ALT) ≤3 times ULN; Aspartate aminotransferase (AST) ≤3 times ULN

Exclusion Criteria:

1. Known allergy to the study drug or its excipients.
2. Presence of severe and/or uncontrolled infection.
3. Severe cardiac disease, including: heart failure classified as New York Heart Association (NYHA) functional class III or IV; history of acute myocardial infarction within 6 months prior to screening; uncontrolled arrhythmias or electrophysiological abnormalities such as sick sinus syndrome, third degree atrioventricular block, QTc > 480 ms, ventricular tachycardia, persistent atrial fibrillation with rapid ventricular response, etc.; or severe structural cardiac abnormalities on echocardiography or left ventricular ejection fraction (LVEF) < 50 %.
4. Primary central nervous system diseases, including cerebrovascular accident, intracranial infection, etc., within six months before screening.
5. Severe primary pulmonary diseases, including significant impairment of pulmonary ventilation/diffusion function, respiratory failure, etc.
6. Severe hepatic impairment: total bilirubin (TB), gamma glutamyl transferase (γGT), ALT, or AST > 3 times ULN at baseline or after hepatoprotective therapy; or conditions such as severe hepatitis, cirrhosis, etc.
7. Severe renal impairment: serum creatinine > 1.5 × ULN; or uncorrected acute kidney injury.
8. Acute or chronic pancreatitis, with serum amylase > 3 × ULN.
9. Pregnancy or lactation.
10. History of other prior malignancies that may affect protocol compliance or interpretation of study results.
11. Diagnosed major psychiatric disorder or predisposition to psychiatric illness that would significantly impair the ability to participate in the clinical study.
12. Any other condition deemed by the investigator as unsuitable for study enrollment.

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: intervention group; BEBT-908 for Injection, dosage of administration:12.3mg/m2，frequency and duration of administration: on the 1st,3rd,5th,8th, 10th and 12th days of each cycle and 28 days as a cycle.; Cyclophosphamide Injection, dosage of administration: 150 mg/m2 every 12 hours on days 1 to 3 of odd cycles, and 28 days as a cycle.; Vincristine Injection, dosage of administration: 1.4mg/m2 on day 4 and 11 of odd cycles, and 28 days as a cycle.; Dexamethasone Injection, dosage of administration: 20 mg per day on days 1 to 4 and 11 to 14 of odd cycles, and 28 days as a cycle.; Methotrexate Injection, dosage of administration: 1g/m2 on day 1 of even cycles, and 28 days as a cycle.; Cytarabine Injection, dosage of administration: 0.5 g/m2 given every 12 hours on day 2 and 3 of even cycles, and 28 days as a cycle.

Drug: BEBT-908; BEBT-908 for Injection, dosage of administration: 12.3mg/m2，frequency and duration of administration: on the 1st,3rd,5th,8th,10th and 12th days of each cycle, and 28 days as a cycle.; Drug: Cyclophosphamide; Cyclophosphamide Injection, dosage of administration: 150 mg/m2 every 12 hours on days 1 to 3 of odd cycles, and 28 days as a cycle.; Drug: Vincristine; Vincristine Injection, dosage of administration: 1.4mg/m2 on day 4 and 11 of odd cycles, and 28 days as a cycle.; Drug: Dexamethasone; Dexamethasone Injection, dosage of administration: 20 mg per day on days 1 to 4 and 11 to 14 of odd cycles, and 28 days as a cycle.; Drug: Methotrexate; Methotrexate Injection, dosage of administration: 1g/m2 on day 1 of even cycles, and 28 days as a cycle.; Drug: Cytarabine; Cytarabine Injection, dosage of administration: 0.5 g/m2 given every 12 hours on day 2 and 3 of even cycles, and 28 days as a cycle.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
MRD negativity rate	The proportion of patients who reach MRD negative	At the end of Cycle 2 of BEBT-908 combined chemotherapy treatment (each cycle is 28 days)

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Overall survival (OS)	Interval from the date of the feedback to the time of death due to any reason	up to 24 months
Relapse-free survival (RFS)	Interval from the date of BEBT-908 treatment to the time of diagnosis of hematological recurrence or death from any cause	up to 24 months
Progression-Free Survival (PFS)	Interval from the date of BEBT-908 treatment to the time of diagnosis of disease progression or death from any cause	up to 24 months
Incidence of adverse events	The proportion of patients who have adverse events after BEBT-908 treatment	up to 24 months

Collaborators and Investigators

• Sponsor: Ruijin Hospital

Study record dates

Study Major Dates

• Study Start (Estimated): December 15, 2025
• Primary Completion (Estimated): December 31, 2028
• Study Completion (Estimated): December 31, 2028

Study Registration Dates

• First Submitted: December 9, 2025
• First Submitted That Met QC Criteria: December 23, 2025
• First Posted (Actual): December 24, 2025

Study Record Updates

• Last Update Posted (Actual): December 24, 2025
• Last Update Submitted That Met QC Criteria: December 23, 2025
• Last Verified: December 1, 2025

More Information

Terms related to this study

• Keywords: Minimal Residual Disease; BEBT-908; Pre-B acute lymphoblastic leukemia; MEF2D-rearranged
• Additional Relevant MeSH Terms: Pathologic Processes; Neoplasms; Immune System Diseases; Neoplasms by Histologic Type; Hematologic Diseases; Neoplastic Processes; Lymphatic Diseases; Lymphoproliferative Disorders; Immunoproliferative Disorders; Leukemia, Lymphoid; Leukemia; Pathological Conditions, Signs and Symptoms; Hemic and Lymphatic Diseases; Neoplasm, Residual; Precursor Cell Lymphoblastic Leukemia-Lymphoma; Precursor B-Cell Lymphoblastic Leukemia-Lymphoma; Organic Chemicals; Heterocyclic Compounds, 1-Ring; Heterocyclic Compounds; Heterocyclic Compounds, 2-Ring; Heterocyclic Compounds, Fused-Ring; Nucleic Acids, Nucleotides, and Nucleosides; Hydrocarbons; Alkaloids; Polycyclic Compounds; Indoles; Cytidine; Pyrimidine Nucleosides; Pyrimidines; Pregnadienes; Pregnanes; Steroids; Fused-Ring Compounds; Steroids, Fluorinated; Phosphoramide Mustards; Nitrogen Mustard Compounds; Mustard Compounds; Hydrocarbons, Halogenated; Phosphoramides; Organophosphorus Compounds; Nucleosides; Pterins; Pteridines; Pregnadienetriols; Vinca Alkaloids; Secologanin Tryptamine Alkaloids; Indole Alkaloids; Indolizidines; Indolizines; Arabinonucleosides; Aminopterin; Dexamethasone; Methotrexate; Cyclophosphamide; Cytarabine; Vincristine; BEBT-908
• Other Study ID Numbers: RJ-ALL 2025-B04

Drug and device information, study documents

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