Anemia, Sickle CellNCT00005703
Hemostasis in Sickle Cell Disease--Infancy to Adulthood
An observational study of Anemia, Sickle Cell and Blood Disease, run by National Heart, Lung, and Blood Institute (NHLBI).
Trial summary
To assess in older children and adults with sickle cell disease (SCD) whether intrinsic activation (relevant to the origin of pain and acute inflammation) occurs only during vasocclusive crisis (VOC). Read more about this study
- Who is it for?
- Ages Up to 100 years, men only
- Conditions the study is for
- Anemia, Sickle Cell, Blood Disease
- How many people
- Not given
- Where
- No sites listed yet
- Study dates
- Jul 1995to Jul 1998
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages Up to 100 years
- Men only
- No healthy volunteers
- Child, Adult, Older adult
No eligibility criteria
About this study
To assess in older children and adults with sickle cell disease (SCD) whether intrinsic activation (relevant to the origin of pain and acute inflammation) occurs only during vasocclusive crisis (VOC).
Read the detailed description
BACKGROUND:
Investigations into hemostatic abnormalities associated with sickle cell disease have been numerous. The data suggested that thrombin generation and fibrin formation were increased during steady state, with conflicting data whether further activation occurred in vaso-occlusive crisis. Platelet activation during VOC occurred, with variable findings during steady state. A selective, concomitant evaluation of the hemostatic pathways i.e. intrinsic, tissue factor (TF) or extrinsic activation, fibrinolysis, and platelet-endothelial activation had not been reported. Neither had a longitudinal evaluation been performed in infants during the unique transition period when HbF levels fall from 70 to 80 percent to less than 10 percent.
The study was part of an initiative on "Coagulation, Platelets and Thrombosis in Sickle Disease Pathophysiology". The Request for Applications was released in October 1994.
DESIGN NARRATIVE:
The studies used appropriate 'negative' and 'positive' control groups. Studies included intrinsic markers [kininogen profiling, high molecular weight kininogen (HK) and low molecular weight kininogen (LK) cleavages, western blotting of HK and LK, and kallikrein-alpha2 macroglobulin; extrinsic markers [TF and factor V11a]; other activation and fibrinolytic markers [prothrombin F1.2, FPA, TAT, tPA, PAI-I, D-dimer and plasma alpha2 antiplasmin]; platelet- endothelial markers [evaluation of activation dependent epitopes]. Unequivocal demonstration of contact pathway activation during VOC provided a crucial link between VOC and its accompanying phenomenon including pain, and inflammation. Finally, the studies provided a unique perspective on the continuum of hemostatic changes that unfolded during the course of SCD, and those that developed as vascular insufficiencies supervened in the adult.
The study completion date listed in this record was obtained from the "End Date" entered in the Protocol Registration and Results System (PRS) record.
- Conditions
- Anemia, Sickle Cell, Blood Disease
- Medical subject headings
- Anemia, Sickle Cell, Hematologic Diseases
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted26 May 2000 (estimated)
- Study startJul 1995
- Study completionJul 1998
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Anemia, Sickle CellStudies of the same condition, open and under way.
- More trials run by National Heart, Lung, and Blood Institute (NHLBI)The sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
Sponsor and investigators
- Sponsor type
- US National Institutes of Health
- Investigators
- Marie Stuart, Thomas Jefferson University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00005703
- Sponsor's protocol ID
- 4310
- Other IDs
- R01HL055185
- Status last verified
- Mar 2005
- First submitted
- 25 May 2000
- Last updated
- 13 May 2016
- Results posted
- No
Study at a glance
From the registry record, last updated by the sponsor on 13 May 2016. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Hemostasis in Sickle Cell Disease--Infancy to Adulthood
- ClinicalTrials.gov ID
- NCT00005703
- Acronym / sponsor ID
- 4310
- Conditions
- Anemia, Sickle Cell, Blood Disease
- Study type
- Observational
- Recruitment status
- Completed
- Lead sponsor
- National Heart, Lung, and Blood Institute (NHLBI)US National Institutes of Health
- Study start
- Jul 1995
- Study completion
- Jul 1998 (actual)
- First posted
- 26 May 2000 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
To assess in older children and adults with sickle cell disease (SCD) whether intrinsic activation (relevant to the origin of pain and acute inflammation) occurs only during vasocclusive crisis (VOC).
Detailed description
BACKGROUND:
Investigations into hemostatic abnormalities associated with sickle cell disease have been numerous. The data suggested that thrombin generation and fibrin formation were increased during steady state, with conflicting data whether further activation occurred in vaso-occlusive crisis. Platelet activation during VOC occurred, with variable findings during steady state. A selective, concomitant evaluation of the hemostatic pathways i.e. intrinsic, tissue factor (TF) or extrinsic activation, fibrinolysis, and platelet-endothelial activation had not been reported. Neither had a longitudinal evaluation been performed in infants during the unique transition period when HbF levels fall from 70 to 80 percent to less than 10 percent.
The study was part of an initiative on "Coagulation, Platelets and Thrombosis in Sickle Disease Pathophysiology". The Request for Applications was released in October 1994.
DESIGN NARRATIVE:
The studies used appropriate 'negative' and 'positive' control groups. Studies included intrinsic markers [kininogen profiling, high molecular weight kininogen (HK) and low molecular weight kininogen (LK) cleavages, western blotting of HK and LK, and kallikrein-alpha2 macroglobulin; extrinsic markers [TF and factor V11a]; other activation and fibrinolytic markers [prothrombin F1.2, FPA, TAT, tPA, PAI-I, D-dimer and plasma alpha2 antiplasmin]; platelet- endothelial markers [evaluation of activation dependent epitopes]. Unequivocal demonstration of contact pathway activation during VOC provided a crucial link between VOC and its accompanying phenomenon including pain, and inflammation. Finally, the studies provided a unique perspective on the continuum of hemostatic changes that unfolded during the course of SCD, and those that developed as vascular insufficiencies supervened in the adult.
The study completion date listed in this record was obtained from the "End Date" entered in the Protocol Registration and Results System (PRS) record.
Study design
Who may qualify
- Ages
- Up to 100 years
- Sex
- Male only
- Healthy volunteers
- Not accepted
- Age groups
- Child, Adult, Older adult
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Not reported in the source record.
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 13 May 2016.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Marie Stuart
Thomas Jefferson University
Questions about this trial
What is this clinical trial studying?
An observational study of Anemia, Sickle Cell and Blood Disease, run by National Heart, Lung, and Blood Institute (NHLBI).
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 13 May 2016. Status can change between updates, so confirm with the study contact before making plans.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 13 May 2016.