Registry of Relatives and Patients Carrying Pathogenic Germline DDX41 Variants and Emerging New Syndromes (preDDX)

November 4, 2026 updated by: Groupe Francophone des Myelodysplasies

The preDDX registry aims to study germline genetic predispositions to myeloid neoplasms, in particular those associated with pathogenic DDX41 variants and emerging syndromes.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Not yet recruiting

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.

Detailed Description

The preDDX registry aims to study germline genetic predispositions to myeloid neoplasms, in particular those associated with pathogenic DDX41 variants and emerging syndromes.

It includes patients and, where applicable, their relatives, with prospective collection of clinical, biological and genetic data.

It is a Category 2 Research Involving the Human Person (RIPH2), based mainly on data from routine care, with no imposed therapeutic intervention. Additional procedures with minimal risks and constraints may be performed if necessary.

The data collected will help to better characterize these predispositions and their evolution in real-world practice.

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.
Observational

Enrollment (Estimated)

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.
525

Contacts and Locations

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

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Contact Backup

Study Locations

  • France
      • Argenteuil, France, 95107
        • Centre Hospitalier Argenteuil
        • Contact:
        • Principal Investigator:
          • Benjamin PAPOULAR, MD
      • Bobigny, France, 93000
        • Hôpital Avicenne
        • Contact:
        • Principal Investigator:
          • Ramy RAHME, MD
      • Le Kremlin-Bicêtre, France, 94270
        • Hôpital Bicêtre
        • Contact:
        • Principal Investigator:
          • Marie LE CANN, MD
      • Paris, France, 75012
        • Hôpital Saint-Antoine
        • Contact:
        • Principal Investigator:
          • Pierre HIRSCH, MD
      • Paris, France, 75014
        • Hôpital Cochin
        • Principal Investigator:
          • Lise WILLEMS, MD
        • Contact:
      • Paris, France, 75005
        • Institut Curie
        • Contact:
        • Principal Investigator:
          • Chrystelle COLAS, MD
        • Principal Investigator:
          • Léa VEYRUNE, MD
      • Paris, France, 75010
        • Hôpital Saint Louis
        • Contact:
        • Principal Investigator:
          • Marie SEBERT, MD, PhD
      • Villejuif, France, 94805
        • Institut Gustave Roussy
        • Contact:
        • Principal Investigator:
          • Jean baptiste MICOL, MD

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

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Sampling Method

Non-Probability Sample

Study Population

The registry includes adult patients carrying a germline variant associated with a predisposition to myeloid neoplasms and their biological relatives, where relevant.

Description

Inclusion Criteria:

  • Male or female
  • Age ≥ 18 years
  • Presence of a germline variant (pathogenic, likely pathogenic or in a candidate gene)
  • Followed in a participating center
  • Able and willing to provide written informed consent

Exclusion Criteria:

  • No identified or suspected genetic predisposition
  • No consent

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

  • Observational Models: COHORT
  • Time Perspectives: PROSPECTIVE

Cohorts and Interventions

Group / Cohort

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
Main cohort

Patients and carriers of pathogenic DDX41 variants: cohort dedicated to the study of patients and relatives carrying DDX41 variants.
Exploratory cohort

Cohort dedicated to the study of candidate genes and new predisposition syndromes

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
Age- and sex-specific cumulative incidence of myeloid neoplasms in asymptomatic carriers of a germline DDX41 variant (Main cohort)
Time Frame: From inclusion up to 5 years (end of registry)

Hematological penetrance, estimated as the cumulative risk of developing a myeloid neoplasm (in particular MDS or AML) according to age and sex, using family-based methods that correct for ascertainment bias
From inclusion up to 5 years (end of registry)
Number of new hereditary syndromes predisposing to myeloid neoplasms identified and characterized (Exploratory cohort)
Time Frame: Through registry completion, up to 5 years

Identification and clinical, biological and genetic characterization of new germline predisposition syndromes, based on variants in candidate genes classified according to ACMG criteria
Through registry completion, up to 5 years

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
Factors associated with onset and progression of myeloid neoplasms in germline DDX41 variant carriers (Main cohort)
Time Frame: From inclusion up to 5 years

Association between clinical characteristics (age, sex, comorbidities), exposures, associated germline variants and somatic events, and the occurrence or progression of myeloid neoplasms, with death as a competing event.
From inclusion up to 5 years
Frequency of hematological and extra-hematological manifestations in germline DDX41 variant carriers (Main cohort)
Time Frame: At inclusion and up to 5 years

Proportion of participants with each phenotype: myeloid neoplasms, extra-hematological manifestations and other associated entities
At inclusion and up to 5 years
Response to treatment and overall survival in patients with DDX41-associated MDS or AML Main cohort)
Time Frame: From inclusion up to 5 years

Response rates according to standard disease-specific response criteria, and overall survival
From inclusion up to 5 years
Penetrance of germline variants identified in candidate genes (Exploratory cohort)
Time Frame: From inclusion up to 5 years

Age-specific cumulative risk of myeloid neoplasms among carriers of variants in candidate genes
From inclusion up to 5 years
Clonal evolution in carriers of germline variants in candidate genes (Exploratory cohort)
Time Frame: From inclusion up to 5 years

Description of tumor evolution and trajectories: type and timing of acquired somatic and cytogenetic events and progression to MDS/AML
From inclusion up to 5 years
Proportion of candidate-gene variants with functional evidence of pathogenicity (Exploratory cohort)
Time Frame: Through registry completion, up to 5 years

Functional significance of variants assessed by biological analyses and functional assays
Through registry completion, up to 5 years

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.
Groupe Francophone des Myelodysplasies

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: Marie SEBERT, Pr, Hôpital Saint Louis

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 (Estimated)

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.
November 15, 2026

Primary Completion (Estimated)

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.
November 1, 2031

Study Completion (Estimated)

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.
November 15, 2031

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).
November 4, 2026

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.
November 4, 2026

First Posted (Actual)

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.
November 9, 2026

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.
November 9, 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.
November 4, 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.
October 1, 2026

More Information

Terms related to this study

Keywords

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.
  • PreDDX Registry
  • 2026-A01030-51 (Registry Identifier: preDDX)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

UNDECIDED

IPD Plan Description

Sharing of pseudonymized individual data may be considered on reasoned request to the sponsor, subject to scientific review, GDPR compliance and applicable French regulations.

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

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.

Cookie Settings

We use cookies to ensure that we give you the best experience on our website. For more details carefully read our Privacy and Cookies Policy. ...>>>You can change your preferences or withdraw your consent at any time by deleting the cookies from your website or computer as described in the policy. Please accept it and choose your preferences by ticking the corresponding boxes in the "Manage Settings" section below. Please carefully read our Terms of Service before you proceed with using any part of this website.
«Manage Settings