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Genes Influencing Iron Overload State

17. September 2019 aktualisiert von: St. Jude Children's Research Hospital

Iron overload, which can be defined operationally as too much iron in the body, develops as a consequence of too many blood transfusions given, or due to genetic defects hereditary hemochromatosis). Iron accumulates in several organs in the body, such as the heart, liver, endocrine glands (pancreas, thyroid, etc.), and spleen. Excessive iron can damage organs and may even cause death. Iron overload needs to be appropriately monitored and treated to avoid unnecessary morbidity and mortality.

The present study, GENIOS, proposes to test prospectively the hypothesis that genetic modifiers influence the iron overload status of patients receiving transfusions. To test this hypothesis, the study will perform genetic studies to investigate possible genetic influences for iron accumulation in the body and will study iron accumulation not only in the liver, but also in the heart, pancreas, kidneys, and spleen. In addition: the study will investigate if these same genes have any role during treatment of iron overload, in other words, if certain genetic mutations will influence how iron exits the body. This study will also investigate how substances that are known to control the trafficking of iron in and out of the body and its damaging effects to the tissues (hepcidin and non transferrin-bound iron) are linked to the accumulation of iron in the heart and liver. Iron in the body will be measured by R2*MRI and no liver biopsies will be required. Genetic studies will be done by specialized tests using peripheral blood DNA.

Iron accumulates differently in different people and in different organs of the body. Some people accumulate iron faster than others, even when receiving the same number of blood transfusions

Studienübersicht

Status

Abgeschlossen

Detaillierte Beschreibung

This study will focus on the following primary objective:

  • To investigate the association of GSTM1 gene deletion and liver iron concentration in patients with sickle cell disease and transfusional iron-overload.

The Secondary Objectives of the study are:

  • To explore the role of other iron metabolism-associated candidate genes on liver iron concentration of sickle cell patients with transfusional iron-overload.
  • To explore the role of GSTM1 genotypes and other iron metabolism-associated candidate genes on maintenance and decline of liver iron concentration of patients with sickle cell disease and transfusional iron-overload.
  • To explore the role of GSTM1 genotypes and other iron metabolism-associated candidate genes on increase, maintenance, and decline of iron concentration in the heart, pancreas, kidneys, and spleen of patients with sickle cell disease and transfusional iron overload.
  • To explore the role of GSTM1 gene deletion and other iron metabolism-associated candidate genes on increase, maintenance, and decline of iron concentration in the liver, heart, pancreas, kidneys, and spleen of non-sickle cell patients with transfusional iron-overload.
  • To explore the relationship between Non-Transferrin Bound Iron (NTBI), hepcidin, organ function, and iron increase, maintenance, and decline in the liver, heart, pancreas, kidneys, and spleen of patients with transfusional iron overload.

Studientyp

Beobachtungs

Einschreibung (Tatsächlich)

50

Kontakte und Standorte

Dieser Abschnitt enthält die Kontaktdaten derjenigen, die die Studie durchführen, und Informationen darüber, wo diese Studie durchgeführt wird.

Studienorte

    • Tennessee
      • Memphis, Tennessee, Vereinigte Staaten, 38105
        • St. Jude Children's Research Hospital

Teilnahmekriterien

Forscher suchen nach Personen, die einer bestimmten Beschreibung entsprechen, die als Auswahlkriterien bezeichnet werden. Einige Beispiele für diese Kriterien sind der allgemeine Gesundheitszustand einer Person oder frühere Behandlungen.

Zulassungskriterien

Studienberechtigtes Alter

  • Kind
  • Erwachsene
  • Älterer Erwachsener

Akzeptiert gesunde Freiwillige

Nein

Studienberechtigte Geschlechter

Alle

Probenahmeverfahren

Nicht-Wahrscheinlichkeitsprobe

Studienpopulation

Study participants will be patients who receive medical care at St. Jude Children's Research Hospital and have developed iron overload secondary to multiple transfusions. Patients will be approached during regular outpatient visits and will be invited to participate in this study if they meet the inclusion/exclusion criteria and consent to participate in the study. Non-sickle cell patients with transfusional iron overload includes patients with thalassemia, bone marrow failure syndromes, and patients who have received multiple blood transfusions due to marrow aplasia secondary to the use of chemotherapeutic agents. About 40 participants with sickle cell disease are targeted. About 10 participants with non-sickle cell disease are targeted.

Beschreibung

Inclusion Criteria:

  • History of ≥ 12 lifetime erythrocyte transfusions who have not yet initiated treatment to unload iron (iron chelation or therapeutic phlebotomy), or
  • History of ≥ 12 lifetime erythrocyte transfusions who have initiated treatment to unload iron, but had liver iron content measurement (by R2*MRI) within 3 months prior to initiation of iron unloading treatment

Exclusion Criteria

  • Known contraindication to performance of MRI (e.g.: presence of MRI-incompatible ferromagnetic material in the body)
  • Prior participation on the St. Jude MRIRON protocol

Studienplan

Dieser Abschnitt enthält Einzelheiten zum Studienplan, einschließlich des Studiendesigns und der Messung der Studieninhalte.

Wie ist die Studie aufgebaut?

Designdetails

Kohorten und Interventionen

Gruppe / Kohorte
Study participants
Participants with sickle cell disease and transfusional iron-overload, and non-sickle cell disease (thalassemia major, cancer patients, etc.) and iron overload. Participants with iron overload, defined as too much iron in the body as a consequence of too many blood transfusions.

Was misst die Studie?

Primäre Ergebnismessungen

Ergebnis Maßnahme
Maßnahmenbeschreibung
Zeitfenster
This study will measure genetic modifiers influencing the iron overload status of patients receiving transfusions.
Zeitfenster: Once, at participant enrollment
This study will measure the association between GSTM1 gene deletion and other candidate genes and the accumulation and clearance of body iron.
Once, at participant enrollment

Sekundäre Ergebnismessungen

Ergebnis Maßnahme
Maßnahmenbeschreibung
Zeitfenster
To explore the role of other iron metabolism-associated candidate genes on liver iron concentration of sickle cell patients with transfusional iron-overload.
Zeitfenster: Once, at participant enrollment
Once, at participant enrollment
To explore the role of GSTM1 genotypes and other iron metabolism-associated candidate genes on maintenance and decline of liver iron concentration of patients with sickle cell disease and transfusional iron-overload.
Zeitfenster: Once at baseline compared to 3 years after participant enrollment
Once at baseline compared to 3 years after participant enrollment
Explore the role of GSTM1 genotypes and other iron metabolism-associated candidate genes on increase, maintenance, and decline of iron concentration patients with sickle cell disease and transfusional iron overload.
Zeitfenster: Once at baseline compared to 3 years after participant enrollment
Decline of iron concentration is in the heart, pancreas, kidneys, and spleen.
Once at baseline compared to 3 years after participant enrollment
Explore the role of GSTM1 gene deletion and other iron metabolism-associated candidate genes on increase, maintenance, and decline of iron concentration of non-sickle cell patients* with transfusional iron-overload.
Zeitfenster: Once at baseline compared to 3 years after participant enrollment
Decline of iron concentration in the liver, heart, pancreas, kidneys, and spleen of non-sickle cell patients with transfusional iron-overload.
Once at baseline compared to 3 years after participant enrollment
Explore the relationship between Non-Transferrin Bound Iron (NTBI), hepcidin, organ function, and iron increase, maintenance, and decline in the liver, heart, pancreas, kidneys, and spleen of patients with transfusional iron overload.
Zeitfenster: Once at baseline compared to 3 years after participant enrollment
Once at baseline compared to 3 years after participant enrollment

Mitarbeiter und Ermittler

Hier finden Sie Personen und Organisationen, die an dieser Studie beteiligt sind.

Publikationen und hilfreiche Links

Die Bereitstellung dieser Publikationen erfolgt freiwillig durch die für die Eingabe von Informationen über die Studie verantwortliche Person. Diese können sich auf alles beziehen, was mit dem Studium zu tun hat.

Studienaufzeichnungsdaten

Diese Daten verfolgen den Fortschritt der Übermittlung von Studienaufzeichnungen und zusammenfassenden Ergebnissen an ClinicalTrials.gov. Studienaufzeichnungen und gemeldete Ergebnisse werden von der National Library of Medicine (NLM) überprüft, um sicherzustellen, dass sie bestimmten Qualitätskontrollstandards entsprechen, bevor sie auf der öffentlichen Website veröffentlicht werden.

Haupttermine studieren

Studienbeginn (Tatsächlich)

21. September 2010

Primärer Abschluss (Tatsächlich)

31. Juli 2016

Studienabschluss (Tatsächlich)

17. April 2019

Studienanmeldedaten

Zuerst eingereicht

7. Juli 2010

Zuerst eingereicht, das die QC-Kriterien erfüllt hat

7. Juli 2010

Zuerst gepostet (Schätzen)

8. Juli 2010

Studienaufzeichnungsaktualisierungen

Letztes Update gepostet (Tatsächlich)

18. September 2019

Letztes eingereichtes Update, das die QC-Kriterien erfüllt

17. September 2019

Zuletzt verifiziert

1. September 2019

Mehr Informationen

Begriffe im Zusammenhang mit dieser Studie

Arzneimittel- und Geräteinformationen, Studienunterlagen

Studiert ein von der US-amerikanischen FDA reguliertes Arzneimittelprodukt

Nein

Studiert ein von der US-amerikanischen FDA reguliertes Geräteprodukt

Nein

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