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Leukemia, Myeloid, Acute(AML)VABuNCT07762508

A Study of VABu Conditioning Regimen in Allo-HSCT for AML Patients

A study testing Venetoclax, Azacitidine (AZA) and Decitabine 20 mg/m²/day for 5 days in people with Leukemia, Myeloid, Acute(AML) and Hematopoietic Stem Cell Transplantation (HSCT), run by The First Affiliated Hospital of Soochow University at 1 site in China.

Not yet recruiting

Opening soon. The study is approved but enrolment has not started yet. Sites may already take enquiries.

Sites and contacts
Official record
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Trial summary

This study evaluates the effectiveness and safety of a new conditioning regimen called VABu before stem cell transplantation in patients with acute myeloid leukemia (AML) who are in their first complete remission (CR1), classified as non-high-risk per ELN 2022 guidelines, but have poor physical condition (ECOG… Read more about this study

Who is it for?
Ages 18 to 70 years
What is being tested?
Venetoclax, Azacitidine (AZA) and Decitabine 20 mg/m²/day for 5 days
Could I receive a placebo?
No, everyone receives an active treatment
How many people
42 participants
Where
1 siteChina
Study dates
Aug 2026to Jul 2029
Phase
Interventional
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 70 years
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Age 18 to 70 years.
  • Diagnosis of acute myeloid leukemia (AML) other than acute promyelocytic leukemia (APL), with first complete remission (CR1) achieved after induction chemotherapy.
  • Classified as non-high-risk per ELN 2022 risk stratification guidelines.
  • ECOG performance status ≥ 2 (not due to leukemia) OR Hematopoietic Cell Transplantation-Specific Comorbidity Index (HCT-CI) ≥ 2.
  • Willing to undergo allogeneic hematopoietic stem cell transplantation and has a suitable donor.
  • Voluntarily signs informed consent form after full understanding of the study.

Who cannot join

  • Allergy to any component of the study drugs.
  • Psychiatric or psychological disorders that prevent cooperation with treatment.
  • Uncontrolled systemic or local severe infection.
  • Severe dysfunction of major organs (heart, lung, liver, kidney) that, in the investigator's opinion, makes the patient unsuitable for enrollment.
  • Currently participating in or planning to participate in any other clinical study.
  • Any other conditions that, in the investigator's opinion, make the patient unsuitable for enrollment.

Trial locations and contacts

1 site in 1 country. Contact the study team or a site near you to ask about taking part.

Depei Wu, MD, PhD contact

512-67781856

wudepei@suda.edu.cn

China1 site
  • First Affiliated Hospital of Soochow University

    Suzhou, Jiangsu, 215006

    Xiaojin Wu, MD, PhD, 512-67976360, wuxiaojin@suda.edu.cn

Other trials in China

About this study

Official title: A Single-Arm, Prospective Clinical Study of the Efficacy and Safety of VABu Conditioning Regimen in Allogeneic Hematopoietic Stem Cell Transplantation for Non-High-Risk AML Patients in CR1 With Low Performance Status (ECOG ≥ 2) or High Hematopoietic Cell Transplantation-Specific Comorbidity Index (HCT-CI ≥ 2)

This study evaluates the effectiveness and safety of a new conditioning regimen called VABu before stem cell transplantation in patients with acute myeloid leukemia (AML) who are in their first complete remission (CR1), classified as non-high-risk per ELN 2022 guidelines, but have poor physical condition (ECOG performance status ≥ 2) or high comorbidity burden (HCT-CI ≥ 2). VABu combines venetoclax, azacitidine (or decitabine as an alternative), and busulfan. This is a single-arm, prospective study with 42 participants. All participants will receive the VABu regimen followed by stem cell transplantation. The primary outcome measure is 2-year overall survival (OS). Secondary outcomes include 2-year relapse-free survival (RFS), transplant-related mortality (TRM), engraftment failure rate, bloodstream infection (BSI), and 2-year all-cause mortality and non-relapse mortality (NRM). The study is conducted at the First Affiliated Hospital of Soochow University.

Read the detailed description

Acute myeloid leukemia (AML) is the most common acute leukemia in adults. For patients who are unfit for intensive chemotherapy due to poor performance status or high comorbidity burden, allogeneic hematopoietic stem cell transplantation (allo-HSCT) remains the only potential curative treatment. However, these patients often have low transplantation rates and suboptimal outcomes with reduced-intensity conditioning regimens. Venetoclax combined with azacitidine has been established as the standard of care for unfit AML patients, demonstrating high remission rates and good tolerability. Building on this, our center has previously explored the VABu regimen (venetoclax, azacitidine, and busulfan) as a conditioning therapy in elderly AML patients undergoing allo-HSCT, with preliminary results showing reduced chemotherapy-related toxicity and a 2-year overall survival rate of approximately 70%.

This is a single-arm, prospective, single-center study. A total of 42 participants will be enrolled. Eligible participants are patients aged 18 to 70 years with non-APL AML who have achieved first complete remission (CR1), are classified as non-high-risk per ELN 2022 guidelines, and have either ECOG performance status ≥ 2 (not due to leukemia) or HCT-CI ≥ 2. All participants will receive the VABu conditioning regimen followed by allo-HSCT. The VABu regimen consists of venetoclax 600 mg/m² once daily on days -12 to -7, azacitidine 75 mg/m² once daily on days -11 to -7 (or decitabine 20 mg/m² for 5 days), cytarabine 2.0 g/m² every 12 hours on day -6, busulfan 0.8 mg/kg every 6 hours on days -5 to -3, and antithymocyte globulin (ATG) at 2.5 mg/kg/day according to donor type (haploidentical/unrelated donors on days -5 to -2, or matched sibling donors on days -3 to -2). Hematopoietic stem cell infusion occurs on day 0, followed by standard graft-versus-host disease (GVHD) prophylaxis.

The primary outcome measure is 2-year overall survival (OS). Secondary outcome measures include 2-year relapse-free survival (RFS), transplant-related mortality (TRM), engraftment failure rate, bloodstream infection (BSI), and 2-year all-cause mortality and non-relapse mortality (NRM). Safety will be monitored through adverse event collection and grading per CTCAE 5.0 criteria. Follow-up assessments are scheduled at weeks 1, 2, 3, 4, and months 2, 3, 6, 12 post-transplantation. The study period is from August 2026 to July 2029. Statistical analyses will be performed using SPSS and R, with Kaplan-Meier method for OS, and Cox regression and logistic regression for multivariate analyses.

Being tested
Venetoclax, Azacitidine (AZA), Decitabine 20 mg/m²/day for 5 days, Cytarabine (Ara-C), Busulfan (BU)
Keywords
Acute Myeloid Leukemia, Allogeneic Hematopoietic Stem Cell Transplantation, Conditioning Regimen, Venetoclax, Azacitidine, VABu, Low Performance Status, High Comorbidity Index, Single-Arm Study, Prospective Study, AML, Allo-HSCT
Medical subject headings
Leukemia, Myeloid, Acute

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • VenetoclaxDrug

    Venetoclax 600 mg/m² administered orally once daily on days -12 to -7 as part of the VABu conditioning regimen for allogeneic hematopoietic stem cell transplantation. Venetoclax is a selective BCL-2 inhibitor used to enhance anti-leukemic activity.

  • Azacitidine (AZA)Drug

    Azacitidine 75 mg/m² administered subcutaneously once daily on days -11 to -7 as part of the VABu conditioning regimen. This is one of the two optional hypomethylating agents; the alternative is decitabine 20 mg/m² for 5 days. Azacitidine has synergistic anti-leukemic effects when combined with venetoclax.

  • Decitabine 20 mg/m²/day for 5 daysDrug

    Decitabine 20 mg/m² administered intravenously once daily for 5 days on days -11 to -7 as an alternative to azacitidine in the VABu conditioning regimen. This is one of the two optional hypomethylating agents; the alternative is azacitidine 75 mg/m² once daily. Decitabine has synergistic anti-leukemic effects when combined with venetoclax.

  • Cytarabine (Ara-C)Drug

    Cytarabine 2.0 g/m² administered intravenously every 12 hours on day -6 as part of the VABu conditioning regimen. Intermediate-dose cytarabine is used to further eliminate minimal residual disease prior to hematopoietic stem cell infusion.

  • Busulfan (BU)Drug

    Busulfan 0.8 mg/kg administered intravenously every 6 hours on days -5 to -3 as part of the VABu conditioning regimen. Busulfan is an alkylating agent used at reduced intensity to achieve sufficient anti-leukemic effect while minimizing organ toxicity.

  • Antithymocyte Globulin (ATG)Drug

    Antithymocyte globulin (ATG) 2.5 mg/kg/day administered intravenously once daily for graft-versus-host disease (GVHD) prophylaxis. Haploidentical or unrelated donors: ATG given on days -5 to -2 (4 doses). Matched sibling donors: ATG given on days -3 to -2 (2 doses).

Study groups in NCT07762508
Study groupRoleWhat they receive
VABu Conditioning RegimenExperimentalParticipants receive the VABu conditioning regimen followed by allogeneic hematopoietic stem cell transplantation (allo-HSCT). The VABu regimen consists of venetoclax 600 mg/m² once daily on days -12 to -7, azacitidine 75 mg/m² once daily on days -11 to -7 (or decitabine 20 mg/m² for 5 days), cytarabine 2.0 g/m² every 12 hours on day -6, and busulfan 0.8 mg/kg every 6 hours on days -5 to -3. Antithymocyte globulin (ATG) is administered at 2.5 mg/kg/day according to donor type: haploidentical or unrelated donors receive ATG on days -5 to -2 (4 doses), while matched sibling donors receive ATG on days -3 to -2 (2 doses). Hematopoietic stem cell infusion occurs on day 0, followed by standard graft-versus-host disease (GVHD) prophylaxis.
Receives: Drug: Venetoclax; Drug: Azacitidine (AZA); Drug: Decitabine 20 mg/m²/day for 5 days; Drug: Cytarabine (Ara-C); Drug: Busulfan (BU); Drug: Antithymocyte Globulin (ATG)

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. 2-Year Overall Survival (OS)

    Overall survival is defined as the time from enrollment to death from any cause. Participants alive at the end of follow-up will be censored at their last known alive date.

    Measured: 2 years

Secondary outcomes (4)
  1. 2-Year Relapse-Free Survival (RFS)

    Relapse-free survival is defined as the time from enrollment to the first occurrence of relapse or death from any cause, whichever occurs first. Participants alive and relapse-free at the end of follow-up will be censored at their last known disease-free date. Relapse is defined as disease recurrence confirmed by bone marrow morphology, cytogenetics, or molecular testing per ELN 2022 criteria.

    Measured: 2 years

  2. 2-Year All-Cause Mortality, Transplant-Related Mortality (TRM), and Non-Relapse Mortality (NRM)

    All-cause mortality is defined as death from any cause within 2 years of enrollment. Transplant-related mortality (TRM) is defined as death from any cause other than disease relapse or progression, with a focus on transplant-related complications (e.g., infection, GVHD, organ toxicity). Non-relapse mortality (NRM) is defined as death from any cause other than disease relapse or progression, and will be reported as a competing risk for relapse outcomes. The cumulative incidences of TRM and NRM will be estimated separately, and all-cause mortality will be reported as the overall proportion of deaths.

    Measured: 2 years

  3. Engraftment Failure Rate

    Engraftment failure is defined as the failure to achieve neutrophil engraftment by day 28 post-transplantation. Neutrophil engraftment is defined as an absolute neutrophil count ≥ 0.5 × 10⁹/L for three consecutive days. The rate of engraftment failure will be reported as the proportion of participants who fail to achieve engraftment by day 28.

    Measured: Day 28 post-transplantation

  4. Bloodstream Infection (BSI) Rate

    Bloodstream infection is defined as the occurrence of at least one positive blood culture for a bacterial or fungal pathogen during the peri-transplantation period. The BSI rate will be reported as the proportion of participants with at least one episode of bloodstream infection from transplantation to day 28 post-transplantation.

    Measured: Day 28 post-transplantation

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted13 Aug 2026
  2. Study startAug 2026 (estimated)
  3. Primary completionJul 2029 (estimated)
  4. Study completionJul 2029 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrolment
42 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07762508
Sponsor's protocol ID
2026863
Acronym
VABu
Status last verified
Aug 2026
First submitted
8 Aug 2026
Last updated
19 Aug 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
Undecided: The decision on IPD sharing will be made after the study is completed and the primary results are published, taking into consideration institutional policies, ethical approval, and patient privacy protection.

Questions about this trial

What is this clinical trial studying?

A study testing Venetoclax, Azacitidine (AZA) and Decitabine 20 mg/m²/day for 5 days in people with Leukemia, Myeloid, Acute(AML) and Hematopoietic Stem Cell Transplantation (HSCT), run by The First Affiliated Hospital of Soochow University at 1 site in China.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 6 inclusion and 6 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: opening soon, as of the sponsor's last update on 19 Aug 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in China. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Depei Wu, MD, PhD (512-67781856, wudepei@suda.edu.cn), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

2-Year Overall Survival (OS) (time frame: 2 years). It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 19 Aug 2026.

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