Study of a Reduced-toxicity Myeloablative Conditioning Regimen Using Fludarabine and Full Doses of Intravenous Busulfan in Pediatric Patients Not Eligible for Standard Myeloablative Conditioning Regimens (FB4-PEDIA)

September 10, 2026 updated by: Nantes University Hospital

Phase 2 Study of a Reduced-toxicity Myeloablative Conditionning Regimen Using Fludarabine and Full Doses of iv Busulfan in Pediatric Patients Not Eligible for Standard Myeloablative Conditioning Regimens

The purpose of this study is to assess transplant-related mortality (TRM) at one year after allogeneic hematopoietic stem cell transplantation (allo-HSCT) prepared by a "reduced toxicity myeloablative" conditioning regimen in young patients (children and adolescents) with hematologic malignancies.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
50

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 2

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • France
      • Besançon, France
        • University Hospital
      • Bordeaux, France
        • University Hospital
      • Clermont-Ferrand, France
        • University Hospital
      • Grenoble, France
        • University Hospital
      • Lille, France
        • University Hospital
      • Lyon, France
        • University Hospital
      • Marseille, France
        • University Hospital
      • Montpellier, France
        • University Hospital
      • Nancy, France
        • University Hospital
      • Nantes, France
        • University Hospital
      • Paris, France
        • University Hospital
      • Paris, France
        • University Hopsital
      • Rennes, France
        • University Hospital
      • Rouen, France
        • University Hopsital
      • Strasbourg, France
        • University Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

1 year to 25 years (Child, Adult)

Accepts Healthy Volunteers

No

Description

Inclusion Criteria

  • Children and adolescents aged over 12 months and under 25 years
  • Availability of an HLA identical family donor or an HLA-matched unrelated donor (10/10 or 9/10 if the mismatch level is at HLACw for an unrelated donor) or availability of an HLA matched cord blood (5/6 or 6/6)
  • Informed consent signed by patients (18-25 years) and patient's legal representative, parent(s) or guardian (cf p13)
  • Diagnosis of a hematologic malignancy which is a candidate for allo-HSCT, but not eligible for standard or conventional myeloablative conditioning regimens because of high risk for toxicity.

  • Are considered as criteria of non-eligibility for standard or conventional myeloablative conditioning:

    • a history of autologous or allogeneic stem cell transplantation
    • comorbidities or medical history predictive of a prohibitive rate of TRM and toxicity with the use of standard high dose chemotherapy and / or radiotherapy.

Exclusion Criteria:

  • Patient has been administered any other systemic chemotherapeutic drug (including Gemtuzumab) within 21 days prior to trial enrollment and start of the conditioning regimen. Hydroxyurea is permitted if indicated to control induction refractory disease, and IT chemotherapy is allowed if indicated as maintenance treatment for previously diagnosed leptomeningeal disease, that has been in remission for at least 3 months prior to enrollment on this study.
  • Active infection. Protocol PI will be final arbiter if there is uncertainty regarding whether a previous infection is resolved.
  • Children and adolescents who are not older than 12 months and under 25 years
  • A donor who is HLA mismatched at the level of more than one locus.
  • Poor performance status (Lansky < 50%)
  • Life expectancy is severely limited by concomitant illness and expected to be <12 weeks.
  • Left ventricular ejection fraction < 30%. Uncontrolled arrhythmias or symptomatic cardiac disease.
  • Symptomatic pulmonary disease. FEV1, FVC and DLCO <30% of expected corrected for hemoglobin.
  • Creatinine clearance less than 30 mL/m per 1.73 m2 or requiring dialysis
  • Evidence of chronic active hepatitis or cirrhosis. If positive hepatitis serology, discuss with Study Chairman and consider liver biopsy.
  • Effusion or ascites >1L prior to drainage.
  • HIV-positive.
  • Female pregnancy
  • Absence of effective contraception among boys and girls of childbearing potential (that contraception should be continued until 6 months after stopping treatment)
  • Breastfeeding
  • Patient's legal representative, parent(s) or guardian not able to sign informed consent.
  • children's refusal
  • Hypersensitivity to rabbit proteins, to the active substance or to any of the excipients of experimental products

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

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

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Drugs
Fludarabine IV- Busulfan IV (Busilvex®) - Anti-thymocyte globulines (Thymoglobuline®)
Drug: Fludarabine IV- Busulfan IV (Busilvex®) - Anti-thymocyte globulines (Thymoglobuline®)
  • IV fludarabine (30 mg/m²/day for 5 days)
  • IV Busulfan (Busilvex 3.2 mg/kg/day for 4 days) (the Busulfan dose is to be adapted to the weight of the child according to the drug label)
  • Anti-thymocyte globulines (Thymogolubuline, 2.5 mg/kg/day for 2 days).

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Transplant-related mortality (TRM)
Time Frame: 12 months
Evaluation of the cumulative incidence of TRM at 12 months after transplantation
12 months

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Incidence of engraftment
Time Frame: Day+42
Incidence of engraftment defined as the first day of neutrophil (>500/μl for 3 consecutive days). Engraftment failure is defined as neutrophil <500/μl at day+42 after allo-SCT.
Day+42
Evaluation of overall (OS) and disease-free survival (DFS)
Time Frame: 12 months
Evaluation of overall (OS) and disease-free survival (DFS) at 1 year after transplantation
12 months
Cumulative incidence of relapse, death from disease, and non-relapse mortality (NRM)
Time Frame: 12 months
Cumulative incidence of relapse, death from disease, and non-relapse mortality (NRM)
12 months
Cumulative incidences and severity of acute and chronic Graft-versus-Host disease
Time Frame: 12 months
Cumulative incidences and severity of acute and chronic Graft-versus-Host disease
12 months
Immune Recovery (to be determined in a subgroup of patients)
Time Frame: 12 months
Immune Recovery parameters: blood counts, bone marrow aspiration with evaluation of morphological response.
12 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Nantes University Hospital

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Mohamad MOHTY, Professor, Nantes university hospital

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
April 1, 2012

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
October 24, 2017

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
October 24, 2017

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
February 21, 2012

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
April 4, 2012

First Posted (Estimated)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
April 6, 2012

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
September 14, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
September 10, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
April 1, 2018

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • BRD/11/06-N

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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