AzTrials
AzTrials

Healthy VolunteersPhase 2NCT01758432

Phase 2 Healthy Volunteer Study to Evaluate the Ability of PRT064445 to Reverse the Effects of Several Blood Thinner Drugs on Laboratory Tests (Module 1 of 4)

A Phase 2 study testing PRT064445/Apixaban in people with Healthy Volunteers, run by Portola Pharmaceuticals at 1 site in United States.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
Search all trials

Trial summary

The purpose of this study is to evaluate the ability of PRT064445 to reverse the effects of several blood thinner drugs on laboratory tests. The study also is evaluating the blood levels of PRT064445 given at different doses. Read more about this study

Who is it for?
Ages 18 to 45 yearsHealthy volunteers can take part
Conditions the study is for
Healthy Volunteers
What is being tested?
PRT064445/Apixaban
Type of treatment
Injection or infusion
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
54 participants
Where
1 siteUnited States
Study dates
Dec 2012to Sep 2015
Phase
Phase 2
Are there results?
Yes, posted in the registrySummary in the doctors' view

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 18 to 45 years
  • All sexes
  • Healthy volunteers accepted
  • Adult

Who may be able to join

  • Healthy men or women between the ages of 18 and 45 years old

Who cannot join

  • History (including family history) or symptoms of, or risk factors for bleeding
  • History (including family history) of or risk factors for a hypercoagulable or thrombotic condition
  • Absolute/relative contraindication to anticoagulation or treatment with specific anticoagulants
  • History of major surgery, severe trauma or bone fracture within 3 months prior to dosing; or planned surgery within 1 month after dosing.

Trial locations and contacts

1 site in 1 country.

United States1 site
  • Study site

    Tempe, Arizona, 85283

Other trials in United States

About this study

Official title: A Randomized, Double-Blind, Vehicle-Controlled Study to Assess the Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of Intravenously Administered PRT064445 After Dosing to Steady State With One of Four Direct/Indirect fXa Inhibitors in Healthy Volunteers

The purpose of this study is to evaluate the ability of PRT064445 to reverse the effects of several blood thinner drugs on laboratory tests. The study also is evaluating the blood levels of PRT064445 given at different doses.

Read the detailed description

A randomized, double-blind, vehicle-controlled study to assess the safety, tolerability, pharmacokinetics, and pharmacodynamics of intravenously administered PRT064445 after dosing to steady state with one of four direct/indirect fXa inhibitors in healthy volunteers

Being tested
PRT064445/Apixaban, Placebo/Apixaban, Placebo
Keywords
Healthy volunteers

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • PRT064445/ApixabanCombination product

    Also called Andexanet

  • Placebo/ApixabanCombination product

  • PlaceboDrug

Study groups in NCT01758432
Study groupRoleWhat they receive
Module 1 (90 mg bolus)Experimental90 mg PRT064445 given as a single IV
Receives: Combination Product: PRT064445/Apixaban; Combination Product: Placebo/Apixaban
Module 1 (210 mg bolus)Experimental210 mg PRT064445 given as a single IV bolus
Receives: Combination Product: PRT064445/Apixaban; Combination Product: Placebo/Apixaban
Module 1 (420 mg bolus)Experimental420 mg PRT064445 given as a single IV bolus
Receives: Combination Product: PRT064445/Apixaban; Combination Product: Placebo/Apixaban
Module 1 (420 mg bolus + 180 mg infusion) 4 mg/minExperimental600 mg PRT064445 given as follows: 420 mg IV over ~14 minutes (~30 mg/min), followed by a continuous infusion of 180 mg (4 mg/min over 45 minutes)
Receives: Combination Product: PRT064445/Apixaban; Combination Product: Placebo/Apixaban
Module 1 (420 mg bolus + 180 mg bolus) 30mg/minExperimental600 mg PRT064445 given as follows: up to 420 mg IV over ~14 minutes (~30 mg/min), followed by a second bolus of 180 mg IV over ~6 minutes (~30 mg/min), 45 minutes after completion of the bolus
Receives: Combination Product: PRT064445/Apixaban; Combination Product: Placebo/Apixaban
Module 1 (420 mg bolus + 480 mg infusion) 4mg/minExperimental900 mg PRT064445 given as follows: 420 mg IV, followed by a continuous infusion of 480 mg (4 mg/min over 120 minutes
Receives: Combination Product: PRT064445/Apixaban; Combination Product: Placebo/Apixaban
Module 1 PlaceboPlacebo comparatorPlacebo administered intravenously (IV) as a bolus, two bolus doses or a bolus followed by continuous infusion.
Receives: Drug: Placebo

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Efficacy: Percent Change From Baseline in Anti-fXa Activity at 2 Mins Following Andexanet/Placebo Administration

    Anti-fXa activity was measured immediately prior to (Baseline) and at 2 mins following andexanet/placebo administration. Anti-fXa activity was measured using a commercial kit (Coamatic Heparin-82 33 9363, DiaPharma)

    Measured: Baseline to 2 minutes following the end of andexanet/placebo administration

Secondary outcomes (8)
  1. Efficacy: Percent Change From Baseline in Thrombin Generation at 2 Mins Following Andexanet/Placebo Administration

    Thrombin generation was measured immediately prior to (Baseline) and at 2 mins following andexanet/placebo administration. Thrombin generation was measured using a TF-initiated thrombin generation assay.

    Measured: Baseline to 2 minutes following the end of andexanet/placebo administration

  2. Efficacy: Percent Change From Baseline in Unbound Apixaban Plasma Concentration at 2 Mins Following Andexanet/Placebo Administration

    Unbound apixaban concentrations was measured immediately prior to (Baseline) and at 2 mins following andexanet/placebo administration. Unbound plasma concentrations for apixaban were determined by a rapid equilibrium dialysis method followed by Liquid Chromatography-Mass Spectometry assay.

    Measured: Baseline to 2 minutes following the end of andexanet/placebo administration

  3. Andexanet Maximum Observed Plasma Concentration (Cmax)

    Plasma concentrations of andexanet was determined using a validated method that involved analysis of citrated human plasma by an electrochemiluminescent assay. Cmax was taken directly from the raw data.

    Measured: Blood was collected at predose, 0.033, 0.2, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4.5, 5.5, 6.5, 7.5, 8.5 and 14.5 hours postdose.

  4. Andexanet Time of Maximum Observed Plasma Concentration (Tmax)

    Plasma concentrations of andexanet was determined using a validated method that involved analysis of citrated human plasma by an electrochemiluminescent assay. Tmax was taken directly from the raw data.

    Measured: Blood was collected at predose, 0.033, 0.2, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4.5, 5.5, 6.5, 7.5, 8.5 and 14.5 hours postdose.

  5. Andexanet Total Volume of Distribution (Vss)

    Plasma concentrations of andexanet was determined using a validated method that involved analysis of citrated human plasma by an electrochemiluminescent assay. Vss was calculated using a non-compartmental approach.

    Measured: Blood was collected at predose, 0.033, 0.2, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4.5, 5.5, 6.5, 7.5, 8.5 and 14.5 hours postdose.

  6. Andexanet Area Under the Drug Concentration-time Curve From Time 0 Extrapolated to Infinity (AUC0-inf )

    Plasma concentrations of andexanet was determined using a validated method that involved analysis of citrated human plasma by an electrochemiluminescent assay. AUC0-inf was calculated using a non-compartmental approach

    Measured: Blood was collected at predose, 0.033, 0.2, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4.5, 5.5, 6.5, 7.5, 8.5 and 14.5 hours postdose.

  7. Andexanet Total Systemic Clearance (CL)

    Plasma concentrations of andexanet was determined using a validated method that involved analysis of citrated human plasma by an electrochemiluminescent assay. CL was calculated using a non-compartmental approach, calculated as Dose/AUC0-inf

    Measured: Blood was collected at predose, 0.033, 0.2, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4.5, 5.5, 6.5, 7.5, 8.5 and 14.5 hours postdose.

  8. Andexanet Apparent Terminal Elimination Half-life (t1/2)

    Plasma concentrations of andexanet was determined using a validated method that involved analysis of citrated human plasma by an electro chemiluminescent assay. t1/2 was determined by linear regression of the log concentration on the terminal portion of the plasma concentration-time curve.

    Measured: Blood was collected at predose, 0.033, 0.2, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4.5, 5.5, 6.5, 7.5, 8.5 and 14.5 hours postdose.

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted1 Jan 2013 (estimated)
  2. Study startDec 2012
  3. Primary completionSep 2015
  4. Study completionSep 2015

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 2
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Model description
This study has four modules with a total of 21 cohorts, each module was reported and submitted separately. Module 1, NCT01758432 (54 subjects with 7cohorts including placebo); Module 2, NCT03578146 (48 subjects with 6 cohorts including placebo); Module 3, NCT03551730 (27 subjects with 4 cohorts including placebo); Module 4, NCT03551743 (28 subjects with 4 cohorts including placebo)
Masking
Quadruple blind
Who is masked
Participant, Care provider, Investigator, Outcomes assessor
Enrolment
54 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT01758432
Sponsor's protocol ID
12-502 Module 1
Status last verified
Aug 2023
First submitted
18 Dec 2012
Last updated
7 Aug 2023
Data monitoring committee
Yes

Publications

  • Siegal D, Lu G, Leeds JM, Karbarz M, Castillo J, Mathur V, Hutchaleelaha A, Sinha U, Kitt M, McClure M, Hollenbach SJ, Curnutte JT, Conley PB, Crowther M. Safety, pharmacokinetics, and reversal of apixaban anticoagulation with andexanet alfa. Blood Adv. 2017 Sep 22;1(21):1827-1838. doi: 10.1182/bloodadvances.2017007112. eCollection 2017 Sep 26.

    PubMed 29296829

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing PRT064445/Apixaban in people with Healthy Volunteers, run by Portola Pharmaceuticals at 1 site in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 1 inclusion and 4 exclusion criteria. 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 7 Aug 2023. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

Yes. Results are posted in the registry (first posted 10 Aug 2018). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

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.

What does the primary outcome measure?

Efficacy: Percent Change From Baseline in Anti-fXa Activity at 2 Mins Following Andexanet/Placebo Administration (time frame: Baseline to 2 minutes following the end of andexanet/placebo administration). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT01758432, which also lists 1 linked publication.

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 7 Aug 2023.

Free account

Log in to keep searching

You’ve used your 3 free searches. AzTrials is free: log in or create a free account to keep searching clinical trials and save the ones you want to follow.

Create a free accountLog in
Clinical Trial NCT01758432 | AzTrials