HHV-6-specific T-cell Reconstitution Among Children and Adolescents After Allogeneic Stem. (CIRAST HHV-6)

February 5, 2024 updated by: Medical University of Graz
Human herpesvirus 6 (HHV-6) causes only minor symptoms in healthy individuals but in immunosuppressed patients, e.g., patients after allogeneic stem cell transplantation (HSCT), HHV-6 reactivations can lead to diseases in different organ systems. HHV-6 reactivations have also been reported to be a cause for delayed engraftment, a trigger of graft-versus-host disease and a co-factor for other virus reactivations. T-lymphocytes play an important role in the control of virus reactivations. Little is known about the development of virus-specific T-cells after allogeneic HSCT.

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.

Detailed Description

Background:

Human herpesvirus 6 (HHV-6) causes only minor symptoms in healthy individuals but in immunosuppressed patients, e.g., patients after allogeneic stem cell transplantation (HSCT), HHV-6 reactivations can lead to diseases in different organ systems. HHV-6 reactivations have also been reported to be a cause for delayed engraftment, a trigger of graft-versus-host disease and a co-factor for other virus reactivations. T-lymphocytes play an important role in the control of virus reactivations. Little is known about the development of virus-specific T-cells after allogeneic HSCT.

Objective:

The aim of this study was the description of the HHV-6 specific cellular immunity in children and adolescents after allogeneic HSCT in the context of the clinical course.

Study design and participants:

For this prospective, cross-sectional study, 28 children and adolescents after allogeneic HSCT who received follow-up support at the respective centers were included. Patients were enrolled up to 24 months after allogeneic HSCT.. Peripheral venous blood was drawn 3, 6, 9, 12, 18, and 24 months after allogeneic HSCT. Furthermore, a blood sample was taken from 25 age- and sex-matched healthy controls without any inflammatory, immunological, or infectious diseases. This study was approved by the Institutional Review Board of the Medical University Graz and patients, parents or legal guardians of patients gave written informed consent in accordance with the Declaration of Helsinki.

Methods:

3, 6, 9, 12, 18 and 24 months after allogeneic HSCT peripheral blood mononuclear cells were isolated from patient blood, stimulated with HHV-6-specific antigen (U54) and cultured for 10 days. Furthermore, a blood sample was taken from 25 age- and sex-matched healthy controls without any inflammatory, immunological, or infectious diseases.

On day 10, peripheral blood mononuclear cells were re-stimulated with the virus antigen U54 for 6 hours and, thereafter, stained for surface markers (CD3, CD4, CD8, CD56) and intracytoplasmatic activation markers IL-2 (Interleukin-2), IFN-γ (Interferon-γ), TNF-α (tumor necrosis factor-α) for flow cytometric detection of virus-specific T-cells. T-cells with intracytoplasmic expression of activation markers after stimulation with the virus antigen are HHV-6-specific T-cells. This indicated HHV-6 specific cellular immunity.

The virus-specific immunity of patients to HHV-6 was compared to the virus-specific immunity of children and adolescents of a control group.

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 (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.
53

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

  • Child
  • Adult

Accepts Healthy Volunteers

Yes

Sampling Method

Non-Probability Sample

Study Population

28 children with adolescent after allogeneic HSCT 25 healthy cildren as control (age and sex mached)

Description

Inclusion Criteria:

Patients who have undergone allogeneic SCT (stem cell transplantation) at one of the participating centers in the last 24 months or who will undergo allogeneic SCT during the study period (up to 3 months before the end of the study) and complete follow-up care at the respective centers

  • Age> 1 year
  • Written consent by participant or legal guardian

Exclusion Criteria:

  • severe SCT-associated complications during the study period: Rejection of the transplant ("graft failure") severe graft-versus-host disease (GVHD grade 3 or 4)
  • Relapse of the (malignant) underlying disease or occurrence of another complication (e.g. secondary malignancy), which represents an indication for cytotoxic chemotherapy (or re-transplantation) during the examination period.

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

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.
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.
allogeneic HSCT peripheral blood
3, 6, 9, 12, 18 and 24 months after allogeneic HSCT peripheral blood mononuclear cells were isolated from patient blood, stimulated with HHV-6-specific antigen (U54) and cultured for 10 days.
Other: Cell cultivation, Antigen testing

day 10, peripheral blood mononuclear cells were re-stimulated with the virus antigen U54 for 6 hours and, thereafter, stained for surface markers (CD3, CD4, CD8, CD56) and intracytoplasmatic activation markers (IL-2, IFN-γ, TNF-α) for flow cytometric detection of virus-specific T-cells. T-cells with intracytoplasmic expression of activation markers after stimulation with the virus antigen are HHV-6-specific T-cells. This indicated HHV-6 specific cellular immunity.

No more interventions in human except blood sampling, only basic research.
healthy blood
One blood sample from a age and sex matched healthy controls without any inflammatory, immunological or infectious disease was taken. mononuclear cells were isolated from patient blood, stimulated with HHV-6-specific antigen (U54) and cultured for 10 days.
Other: Cell cultivation, Antigen testing

day 10, peripheral blood mononuclear cells were re-stimulated with the virus antigen U54 for 6 hours and, thereafter, stained for surface markers (CD3, CD4, CD8, CD56) and intracytoplasmatic activation markers (IL-2, IFN-γ, TNF-α) for flow cytometric detection of virus-specific T-cells. T-cells with intracytoplasmic expression of activation markers after stimulation with the virus antigen are HHV-6-specific T-cells. This indicated HHV-6 specific cellular immunity.

No more interventions in human except blood sampling, only basic research.

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
CD4+ controls
Time Frame: 1 day
secretion of IL-2, IFN-γ as well as TNF-α (single cytokines and in combination) i T-cells after stimulation with the HHV-6 specific antigen U54
1 day
CD8+ patients after allogeneic HSCT
Time Frame: 24 month
secretion of IL-2, IFN-γ as well as TNF-α (single cytokines and in combination) i T-cells after stimulation with the HHV-6 specific antigen U54
24 month
CD8+ controls
Time Frame: 1 day
secretion of IL-2, IFN-γ as well as TNF-α (single cytokines and in combination) i T-cells after stimulation with the HHV-6 specific antigen U54
1 day
CD4+ patients after allogeneic HSCT
Time Frame: 24 month
secretion of IL-2, IFN-γ as well as TNF-α (single cytokines and in combination) i T-cells after stimulation with the HHV-6 specific antigen U54 of IL-2, IFN-γ as well as TNF-α (single cytokines and in combination) in both
24 month

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.
Medical University of Graz

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.
March 14, 2014

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.
December 31, 2016

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.
November 1, 2023

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 5, 2024

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.
February 5, 2024

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.
February 13, 2024

Study Record Updates

Last Update Posted (Estimated)

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.
February 13, 2024

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.
February 5, 2024

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.
February 1, 2024

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.
  • CIRAST HHV-6

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

UNDECIDED

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.

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