Working… Menu

Safety and Dosing Evaluation of REG1 Anticoagulation System

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00113997
Recruitment Status : Completed
First Posted : June 13, 2005
Last Update Posted : March 4, 2008
Information provided by:
National Institutes of Health Clinical Center (CC)

Brief Summary:

This 1-week study will test the safety and dosing of an anticoagulation system called REG1 that is designed to improve control of "blood thinning." Patients with heart attack and other conditions require treatment with an anticoagulant (blood thinner) to prevent the formation of blood clots. However, anticoagulation therapy can increase the risk of bleeding. The REG1 system is designed to minimize this risk. One part of the system stops the activity of factor IX (a protein that helps blood clot) while the other part of the system (the antidote) inactivates the drug and stops the thinning process. This study will examine in normal healthy subjects how the REG1 system works in the body and how it leaves the body.

Healthy normal volunteers between 12 and 65 years of age who weigh 50-120 kilograms (110-264 pounds) and have no history of bleeding problems or significant bleeding may be eligible for this study. Candidates are screened with a medical history, physical examination, and blood tests.

Participants must avoid foods that may alter the blood's clotting ability and must not take any medications the week of the study. They undergo the following tests and procedures:

Day 1

Subjects are admitted to the NIH Clinical Center for an overnight stay. Two catheters (plastic tubes) are placed in the subject's arm veins, one for drawing blood samples and the other for injecting one of the following: REG1 drug, REG1 antidote, REG1 drug and antidote, or placebo. Two injections of study medication are given, spaced 3 hours apart, each over a 1-minute period. After each injection, blood is collected at specific times to measure levels of the drug or antidote in the body and the blood's ability to clot. Subjects also provide a 24-hour urine collection and stool sample.

Day 2

A blood sample is drawn 24 hours after the drug or antidote injection from the previous day. If the blood test result is normal, subjects are discharged home with instructions to follow. They return to the Clinical Center at 36 hours and 48 hours for additional blood samples.

Days 3 and 7

A blood sample is collected at the end of day 3 and day 7. Urine and stool samples are also collected.

Condition or disease Intervention/treatment Phase
Healthy Drug: REG1 Phase 1

Show Show detailed description

Layout table for study information
Study Type : Interventional  (Clinical Trial)
Enrollment : 106 participants
Primary Purpose: Treatment
Official Title: The Healthy Volunteer Evaluation of an Aptamer-RNA Target to Factor IXa
Study Start Date : June 2005
Study Completion Date : October 2005

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Layout table for eligibility information
Ages Eligible for Study:   Child, Adult, Older Adult
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No


  • Participants are eligible if they meet the following criteria:
  • Age is greater than or equal to 21 years to 65 years
  • Ability to give written informed consent
  • Weight between 50 Kg and 120 Kg


  • Participants are NOT eligible under the following conditions:
  • Age is less than 21 years
  • Subject weight is less than 50 Kg of greater than 120 Kg
  • Females - Pregnant or lactating
  • Females - active menstruation on day of injection (Females may be randomized if they are not actively menstruating on day of injection or they can be randomized as soon as menstruation ceases)
  • Any medical condition (other than a self-limited illness) that requires ongoing and current medical attention
  • Any prescription medication (including oral or patch or injectable contraceptives)
  • Any use of NSAIDS or aspirin in the prior 7 days
  • Any known individual or family history of a bleeding diathesis or coagulopathy
  • Any history of thrombocytopenia, or baseline platelet count less than 150,000
  • Any history of thrombocytosis or baseline platelet count greater than 600,000
  • Endoscopic peptic ulcer disease in the past 3 years or GI bleeding in the past 3 months
  • Genitourinary bleeding within the past 3 months
  • Severe trauma, fracture, major surgery, or biopsy of a parenchymal organ within the past 3 months
  • Any evidence or history of intracranial bleeding or aneurysm
  • Any history of thrombotic or hemorrhagic stroke
  • Severe persistent hypertension (systolic pressure greater than 180 mm Hg or diastolic greater than 110 mm Hg)
  • Baseline Hgb less than 12.0 g/dL, PT greater than ULN, or APTT greater than ULN
  • Baseline liver dysfunction (ALT, AST, bilirubin, or alkaline phosphatase greater than ULN)
  • Baseline renal dysfunction (serum creatinine or BUN greater than ULN)
  • Use of an investigational drug within the past 30 days
  • Any factor that might influence ability to return for follow-up visits
  • Illicit drug or alcohol abuse
  • Inability to comply with the study protocol

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00113997

Layout table for location information
United States, Maryland
National Heart, Lung and Blood Institute (NHLBI)
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
National Heart, Lung, and Blood Institute (NHLBI)
Layout table for additonal information Identifier: NCT00113997    
Other Study ID Numbers: 050164
First Posted: June 13, 2005    Key Record Dates
Last Update Posted: March 4, 2008
Last Verified: October 2005
Keywords provided by National Institutes of Health Clinical Center (CC):
Healthy Volunteer