ClinicalTrials.gg
RecruitingNCT07183878Ven-BUCYUpdated Sep 2, 2026

Venetoclax-Enhanced BUCY vs. Standard BUCY Conditioning in High-Risk AML and MDS Patients Undergoing Allo-HSCT (Ven-BUCY Study)

An interventional study of Venetoclax and None-placebo in Acute Myeloid Leukemia, High-Risk Acute Myeloid Leukemia and Myelodysplastic Syndromes, sponsored by First Affiliated Hospital of Zhejiang University. Recruiting at 1 site in China. Open to participants aged 12 Years to 60 Years. Per ClinicalTrials.gov, last updated 2026-09-02.

Sponsored by First Affiliated Hospital of Zhejiang University · Not applicable, Interventional, and Treatment

From the registry’s dates

  • Started Aug 2025; still recruiting 1 year 2 months later.

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Phase
Not applicable
Study type
Interventional
Enrollment
138
Allocation
Randomized
Ages
12 Years to 60 Years
Sex
All
01

Where this study stands

Counted across the records on this site · 2026-11-14

Among 202 studies testing venetoclax in Leukemia, Myeloid, Acute — 116 open to participants now, 144 under way, 21 of them phase 3. venetoclax · Leukemia, Myeloid, Acute.

Planned enrollment
45th of 202
138 · median 57
Started
2025
with 21 others
No phase
16 of 202
12 open now
Primary completion
2027-08
later than 66 of 143 live
Registered
175th of 202
by date
Lead sponsor
5 of 202
First Affiliated Hospital of Zhejiang University

Among the 202 studies testing venetoclax in Leukemia, Myeloid, Acute, this one is the 45th largest by planned enrollment, is one of 22 that started in 2025, is one of 16 with no phase, reaches primary completion later than 66 of the 143 other live ones, and was the 175th registered.

Leukemia, Myeloid, Acute

3,668 studies on the registry are indexed under Leukemia, Myeloid, Acute; 816 are open to participants now.

Browse Leukemia, Myeloid, Acute studies →

Open to participants now

116 of the 202 studies testing venetoclax in Leukemia, Myeloid, Acute are open now, in 12 countries. Recruiting first, the newest first:

110 more — sign in →

By country, each count listing its studies:

All 116 open studies →

About venetoclax

venetoclax: first FDA approval 2016 (VENCLEXTA), first EMA approval 2016. What it is approved for, and how studies give it, is on its page →

Who these studies take

Of the 625 Leukemia, Myeloid, Acute studies recruiting now, 363 (58%) set no upper age limit and 222 (36%) stop at 75 or younger; 145 take children under 18; 29 take healthy volunteers.

This study: 12 Years to 60 Years · all sexes · no healthy volunteers.

The full table on the hub →

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Watch this landscapeDownload CSVNarrow it in search →With an account: a weekly mail of what changed among 202 studies testing venetoclax in Leukemia, Myeloid, Acute, or all of them as a file.
02

Study summary

This is a prospective, multicenter, randomized controlled trial designed to evaluate the efficacy and safety of venetoclax-enhanced BUCY (Ven-BUCY) conditioning compared to the standard BUCY regimen in patients with high-risk acute myeloid leukemia (AML) or myelodysplastic syndromes (MDS) undergoing allogeneic hematopoietic stem cell transplantation (allo-HSCT). Eligible participants aged 12 to 60 years will be randomized 1:1 to receive either Ven-BUCY or standard BUCY conditioning. The primary endpoint is relapse-free survival (RFS) at two years post-transplant. Secondary outcomes include overall survival, relapse rate, non-relapse mortality, measurable residual disease (MRD), and treatment-related adverse events. The study aims to improve post-transplant outcomes by deepening disease remission through the addition of venetoclax, a BCL-2 inhibitor known to target leukemia stem cells and enhance chemotherapy sensitivity.

Read the detailed description

Allogeneic hematopoietic stem cell transplantation (allo-HSCT) remains the only curative therapy for high-risk acute myeloid leukemia (AML) and myelodysplastic syndromes (MDS). However, post-transplant relapse remains the leading cause of treatment failure, especially among patients receiving matched sibling or unrelated donor transplants. While myeloablative conditioning (MAC) regimens like BUCY (busulfan + cyclophosphamide) offer stronger anti-leukemic effects compared to reduced-intensity regimens, the relapse rate in high-risk myeloid neoplasms remains unacceptably high, partly due to residual leukemia stem cells (LSCs).

Venetoclax, a selective BCL-2 inhibitor, has shown synergistic effects when combined with hypomethylating agents or intensive chemotherapy. It improves remission depth and targets chemotherapy-resistant LSCs. Emerging data suggest that venetoclax may also enhance graft-versus-leukemia (GVL) effects without significantly increasing the risk of graft-versus-host disease (GVHD).

This investigator-initiated, open-label, two-arm, randomized controlled trial will enroll 138 patients aged 12-60 years with high-risk AML or MDS across six transplant centers in China. Patients will be stratified by disease (AML vs. MDS) and randomized (1:1) to receive either:

Standard BUCY regimen: Busulfan (0.8 mg/kg q6h on day -7 to -4), Cyclophosphamide (60 mg/kg/day on day -3 and -2), and MeCCNU (250 mg/m² on day -1), with optional ATG for donors/recipients >40 years.

Ven-BUCY regimen: Venetoclax (400 mg/day or 360 mg/m²/day from day -14 to -8) in addition to the standard BUCY components, with similar ATG guidance. Antifungal prophylaxis and venetoclax dose adjustment (e.g., to 100 mg with posaconazole) will follow local guidelines.

Patients will be followed weekly during the first month post-transplant, monthly for 6 months, and every 3 months thereafter until 3 years post-enrollment. The primary endpoint is 2-year relapse-free survival (RFS). Secondary endpoints include overall survival (OS), non-relapse mortality (NRM), relapse rate, MRD clearance, and adverse events graded by CTCAE v5.0.

This study seeks to determine whether adding venetoclax to a standard myeloablative regimen can enhance anti-leukemic efficacy and improve long-term outcomes without increasing transplant-related toxicity.

03

Conditions studied

  • Acute Myeloid Leukemia
  • High-Risk Acute Myeloid Leukemia
  • Myelodysplastic Syndromes
  • High-Risk Myelodysplastic Syndromes

Keywords

  • Venetoclax
  • BUCY conditioning
  • Allogeneic Hematopoietic Stem Cell Transplantation
  • Myeloablative Conditioning
  • Relapse-Free Survival
  • Graft-versus-Leukemia
  • GVHD
  • High-Risk AML
  • High-Risk MDS
04

Who can participate

Ages eligible
12 Years to 60 Years
Sexes eligible
All
Accepts healthy volunteers
No

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • Diagnosis of acute myeloid leukemia (AML) or myelodysplastic syndrome (MDS) according to 2022 WHO classification
  • Age between 12 and 60 years
  • High-risk MDS as defined by at least one of the following:

    • IPSS intermediate-2/high risk or IPSS-R intermediate/high/very high risk
    • TP53 mutation
    • RAS pathway mutation (e.g., NRAS, KRAS, PTPN11, CBL, NF1, RIT1, FLT3, KIT)
    • Therapy-related MDS
  • High-risk AML as defined by at least one of the following:

    • TP53, RUNX1, or ASXL1 mutation
    • t(6;9)(p23;q34.1)/DEK-NUP214
    • KMT2A rearrangement
    • BCR-ABL1 fusion
    • inv(3)(q21.3q26.2) or t(3;3)(q21.3;q26.2)
    • -5/del(5q), -7, -17/abn(17p)
    • Complex or monosomal karyotype
    • FLT3-ITD high with wild-type NPM1
    • Initial WBC ≥ 10×10\^9/L
    • Secondary AML with history of MDS/MPN or therapy-related AML
    • AML with specific mutations (SRSF2, SF3B1, U2AF1, ZRSR2, ASXL1, EZH2, BCOR, STAG2)
    • MRD positive before transplantation
  • For AML: must have achieved CR or CRi prior to transplantation; for MDS: bone marrow blasts \< 20%
  • Availability of a matched related or unrelated donor (10/10 or 9/10 HLA match)
  • performance status 0-2
  • ≥ 60 mL/min (Cockcroft-Gault)
  • /ALT ≤ 3 × and total ≤ 2 × ULN
  • ≥ 50% by echocardiogram
  • > 8 weeks
  • Willingness to use effective methods during and for a specified period after the study
  • Signed

Exclusion criteria

Exclusion Criteria:

  • Uncontrolled cardiovascular disease or class III/IV heart failure
  • Other severe comorbid conditions that may interfere with study participation
  • Known infection or uncontrolled active or C
  • Pregnant or breastfeeding women
  • More than one prior hematopoietic stem cell transplantation
  • Inability to understand the study protocol or provide
  • History of grade ≥ 3 non-hematologic adverse reaction to prior venetoclax therapy
  • Receipt of chemotherapy (except hydroxyurea/dexamethasone) or radiotherapy within 14 days before study treatment
  • Ongoing use of BCR-ABL1, IDH, or FLT3 inhibitors without proper washout (≥ 7 days)
Terms in these criteria, in plain language(12)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

ECOG performance status

A scale of how much an illness limits everyday activity. For people being assessed to join a study, scores run from 0 (fully active) to 4; lower is more active.

0
Fully active, no restrictions.
1
Limited in strenuous activity, but walking and able to do light work, such as housework or office work.
2
Walking and able to look after yourself, but unable to work; up and about more than half of waking hours.
3
Able to look after yourself only in part; in bed or a chair more than half of waking hours.
4
Unable to look after yourself at all; in bed or a chair all day.

Studies most often ask for 0–1 or 0–2. Your doctor gives the score; the WHO scale uses the same steps. The full scale also has 5, which records death.

Creatinine clearance (CrCl)

How quickly the kidneys clear creatinine, a waste product, from the blood. A study may estimate it from a blood test with age, weight and sex (often by the Cockcroft–Gault formula), or measure it using blood and urine collected over a set time. Given in mL/min; higher is better.

ALT and AST (liver enzymes)

Two enzymes measured in a routine blood test of the liver. Higher levels can mean the liver is under strain or damaged. SGPT and SGOT are older names for ALT and AST.

Criteria usually give a limit as a multiple of the upper limit of normal (ULN), often higher when cancer has spread to the liver.

ULN (upper limit of normal)

The top of the normal range for a blood test, as set by the laboratory that runs it. Each lab prints its own range next to your result.

“≤ 2.5 × ULN” means the result can be up to two and a half times that top value.

Bilirubin

A yellow substance made when red blood cells are broken down, which the liver clears. A high level can mean a problem with the liver or the bile ducts.

Criteria often allow more for people with Gilbert’s syndrome, a harmless inherited condition that raises bilirubin.

LVEF (left ventricular ejection fraction)

The share of blood the heart’s main pumping chamber (the left ventricle) pushes out with each beat, measured by an echocardiogram (heart ultrasound) or a MUGA scan. About 50–70% is normal.

Life expectancy

The study doctor’s estimate of how long someone is likely to live. Criteria use it so that people can stay in the study long enough for it to answer its question.

Contraception

Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.

Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.

Informed consent

Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.

You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.

NYHA class (heart failure)

The New York Heart Association’s four classes of how much heart failure limits physical activity.

I
No limits: ordinary activity causes no undue tiredness or breathlessness.
II
Slight limits: comfortable at rest, ordinary activity causes symptoms.
III
Marked limits: comfortable at rest, less than ordinary activity causes symptoms.
IV
Symptoms even at rest; any activity makes them worse.

Studies set their own limit — many outside heart failure leave out class III–IV, while heart failure studies may ask for a particular class. Check the class this study names.

HIV

The human immunodeficiency virus, which weakens the immune system.

Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.

Hepatitis B tests

Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.

Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.

05

Study design

Phase
Not applicable
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
None (open label)
Enrollment
138 participants (estimated)

Study arms

  • Experimental
    Vene-BUCY

    Participants in this arm will receive a venetoclax-enhanced BUCY conditioning regimen before undergoing allogeneic hematopoietic stem cell transplantation (allo-HSCT). 1. Venetoclax is administered from day -14 to -8 (400 mg/day for patients ≥14 years; 360 mg/m²/day for patients aged 12-14 years). 2. Busulfan (0.8 mg/kg every 6 hours, days -7 to -4). 3. Cyclophosphamide (60 mg/kg/day, days -3 and -2). 4. MeCCNU (250 mg/m² on day -1). Antithymocyte globulin (ATG) may be added for donor or recipient age \>40 years. Venetoclax dose is reduced if co-administered with strong CYP3A4 inhibitors such as posaconazole.

    Drug: Venetoclax · Drug: Busulfan (BU)

  • Active comparator
    BUCY

    Participants in this arm will receive the standard BUCY myeloablative conditioning regimen prior to allo-HSCT. 1. Busulfan (0.8 mg/kg every 6 hours, days -7 to -4). 2. Cyclophosphamide (60 mg/kg/day, days -3 and -2). 3. MeCCNU (250 mg/m² on day -1). ATG may be included in cases where the donor or recipient is over 40 years old. No venetoclax is used in this arm.

    Other: None-placebo · Drug: Busulfan (BU)

Interventions

  • Venetoclax is administered orally at 400 mg/day for participants ≥14 years or 360 mg/m²/day for those aged 12-14 years, from day -14 to -8 before allogeneic hematopoietic stem cell transplantation (allo-HSCT). Dose is adjusted to 100 mg/day (or 90 mg/m²/day for pediatric patients) if used with strong CYP3A4 inhibitors such as posaconazole.

    Also known as: ABT-199, Venclexta

  • OtherNone-placebo

    Participants in this arm will not receive venetoclax as part of their conditioning regimen. They will undergo standard myeloablative conditioning with BUCY (busulfan, cyclophosphamide, and MeCCNU), prior to allogeneic hematopoietic stem cell transplantation. This arm serves as the active comparator to evaluate the addition of venetoclax in the experimental arm.

  • BUCY group (Control group): Busulfan (BU 0.8 mg/kg/q6h, days -7 to -4), Cyclophosphamide (CTX 60 mg/kg/day, days -3 to -2), and MeCCNU (250 mg/m²/day, day -1). For recipients or donors over 40 years of age, ATG (Thymoglobulin, total dose 2.5-4.5 mg/kg, divided over days -3 to -1) may be added.

    Also known as: Cyclophosphamide, MeCCNU, Busulfan

06

What researchers measure

Primary outcomes

  1. Relapse-Free Survival (RFS)

    Relapse-Free Survival (RFS) is defined as the time from the date of allogeneic hematopoietic stem cell transplantation (allo-HSCT) to the first documented relapse of the primary disease or death from any cause, whichever occurs first. Participants who remain alive and relapse-free will be censored at the time of last follow-up.

    Time frame: From the date of transplantation until relapse or death from any cause, assessed up to 24 months

Secondary outcomes

  1. Overall Survival (OS)

    Overall survival (OS) is defined as the time from the date of transplantation to death from any cause. Patients who are alive at the last follow-up will be censored. Survival curves will be estimated using the Kaplan-Meier method.

    Time frame: Up to 36 months post-transplantation

  2. Non-Relapse Mortality (NRM)

    Non-relapse mortality (NRM) is defined as death from any cause other than disease relapse after transplantation. Competing risk analysis will be used to assess NRM incidence between groups.

    Time frame: Up to 36 months post-transplantation

  3. Relapse Rate

    Relapse rate refers to the cumulative incidence of disease recurrence post-transplantation, assessed through bone marrow evaluation, flow cytometry, and molecular markers. Competing risk models will be applied for statistical analysis.

    Time frame: Up to 36 months post-transplantation

  4. Measurable Residual Disease (MRD) Status

    MRD will be assessed by multiparameter flow cytometry and/or molecular techniques at scheduled timepoints after transplantation to evaluate minimal residual leukemia. MRD positivity and conversion dynamics will be compared between groups.

    Time frame: Assessed monthly during the first 6 months, and then every 3 months until 24 months post-transplantation

  5. Treatment-Related Adverse Events

    Incidence and severity of treatment-related adverse events, including hematologic and non-hematologic toxicities, will be evaluated and graded according to NCI-CTCAE v5.0. Events will be compared between the VEN-BUCY and BUCY groups.

    Time frame: From start of conditioning until 28 days after transplantation, and during follow-up up to 3 months

  6. Incidence of Acute Graft-versus-Host Disease (aGVHD)

    Acute GVHD will be assessed and graded based on MAGIC (Mount Sinai Acute GVHD International Consortium) criteria. The cumulative incidence of grade II-IV and grade III-IV aGVHD will be compared between the VEN-BUCY and BUCY groups.

    Time frame: From day of stem cell infusion to day 100 post-transplantation

  7. Incidence of Chronic Graft-versus-Host Disease (cGVHD)

    Chronic GVHD will be evaluated according to the 2014 NIH consensus criteria. The cumulative incidence of overall and moderate-to-severe cGVHD will be recorded and compared between the two groups.

    Time frame: From day 100 post-transplantation to 36 months

07

Study locations

1 of 1 sites recruiting
08

References and documents

Individual participant data

Plan to share: Yes

Supporting information: Study protocol

No publications or documents are linked to this record.

09

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reachedSimilar studies: half by the dot; the band is the middle halfHalf of similar studies reached it by the dot; the band is the middle half, from a quarter to three quarters

Started Aug 2025 (actual). Primary completion is estimated for Aug 2027, 24 months after the start.

Of 132 non-industry interventional studies with no phase under Leukemia, Myeloid, Acute, half reached primary completion within 49 months of starting (the median), counting those still running; a quarter within 26 and three quarters within 128. This study's planned 24 months is below that.

Counting every sponsor, half of 139 studies reached it within 47 months; a quarter within 25 and three quarters within 123.

How these figures are worked out, and which studies are left out of them.

Registered
Sep 14, 2025
First posted
Sep 19, 2025
StartActual
Aug 20, 2025
Primary completionEst.
Aug 20, 2027
CompletionEst.
Aug 20, 2028
Last update
Sep 2, 2026
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on Sep 2, 2026, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT07183878
Responsible party
Yanmin Zhao (Dr, First Affiliated Hospital of Zhejiang University) — Principal investigator
First posted
Sep 19, 2025
Start date
Aug 20, 2025
Primary completion
Aug 20, 2027 (estimated)
Completion
Aug 20, 2028 (estimated)
Last update
Sep 2, 2026

Study contacts

Yanmin Zhao, MD
Contact
yanminzhao@zju.edu.com
+8657187236706
Yanmin Zhao, MD
principal investigator · Bone Marrow Transplantation Center, The First Affiliated Hospital, Zhejiang University School Of Medicine

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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Studies of the drug tested here: Venetoclax

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