Primaquine Enantiomers in G6PD Deficient Human Volunteers

November 18, 2024 updated by: University of Mississippi, Oxford

Metabolism and Pharmacokinetics of Primaquine Enantiomers in G6PD Deficient Human Volunteers Receiving a Five Day Dose Regimen

This study is a single center, prospective, cross-over phase 1 trial. Eighteen subjects will be enrolled in the study evaluating the metabolism, pharmacokinetic behavior and tolerability of primaquine enantiomers and placebo over the course of 5 days.

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

Each subject will receive a 15 mg dose of one enantiomer (SPQ or RPQ or Placebo) daily for up to 5 days, with careful monitoring of hematological parameters before and after each dose. In addition to the general CMP14 safety criteria, any subject who displays a fractional hemoglobin drop of 15% below his/her baseline value, then drug administration will stop (e.g. for baseline Hgb of 14 g/dL, if there is at any point a decrease of 2.1 g/dL). Hematocrit will be similarly monitored, with proportional stop criteria. Elevation in total bilirubin to 2.0 mg/dL or greater will also be used as a stopping criterion. After stopping drug administration (5 days or whenever stop criteria are met), subjects will have a 3-week washout period, and the study repeated with the other enantiomer, and similarly with Placebo.

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.
Interventional

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.
18

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Contact Backup

Study Locations

  • United States
    • Mississippi
      • University, Mississippi, United States, 38677
        • University of Mississippi

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

18 years to 65 years (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • G6PD deficient, otherwise normal healthy adults aged 18 to 65

Exclusion Criteria:

  • Known history of liver, kidney or hematological disease (other than G6PD deficiency)
  • Known history of cardiac disease, non-sinus rhythm arrhythmia or QT prolongation
  • Autoimmune disorders
  • Report of an active infection
  • Subject is pregnant or breast-feeding, or is expecting to conceive during the study.

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

  • Primary Purpose: Basic Science
  • Allocation: Non-Randomized
  • Interventional Model: Crossover Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
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.
Experimental: RPQ (-) enantiomer
Cohort 1 will receive 15mg of RPQ every day for 5 days. Cohort 2 will receive 22.5 mg of RPQ every day for five days.
Drug: RPQ
The study will compare the individual enantiomers of Primaquine -R-(-)-PQ, S-(+)-PQ, and Placebo.
Other Names:
  • R-(-) Enantiomer of Primiquine Phosphate
Experimental: SPQ (+) enantiomer
Cohort 1 will receive 15mg of SPQ every day for 5 days. Cohort 2 will receive 22.5 mg of SPQ every day for five days.
Drug: SPQ
The study will compare the individual enantiomers of Primaquine -R-(-)-PQ, S-(+)-PQ, and Placebo.
Other Names:
  • S-(+) Enantiomer of Primaquine Phosphate
Placebo Comparator: Placebo
Cohort 1 will receive placebo capsules every day for 5 days. Cohort 2 will receive placebo capsules every day for five days.
Drug: Placebo
The study will compare the individual enantiomers of Primaquine -R-(-)-PQ, S-(+)-PQ, and Placebo.

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
Change in Methemoglobin concentration in blood from baseline
Time Frame: Days 0, 3, 5
Change in Methemoglobin concentration in blood from baseline (% hemoglobin)
Days 0, 3, 5

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Primaquine Plasma Concentration, ng/mL
Time Frame: Days 0, 3, 5
Plasma concentrations of parent drug
Days 0, 3, 5
Carboxy-Primaquine Plasma Contration, ng/mL
Time Frame: Days 0, 3, 5
Plasma concentrations of carboxy-primaquine metabolite
Days 0, 3, 5
Primaquine N-carbamoyl-glucuronide Plasma contration, ng/mL
Time Frame: Days 0, 3, 5
Plasma concentrations of Primaquine N-carbamoyl-glucuronide metabolite
Days 0, 3, 5
Primaquine Orthoquinone Plasma concentration, ng/mL
Time Frame: Days 0, 3, 5
Plasma concentrations of Primaquine Orthoquinone metabolite
Days 0, 3, 5
Change in Hematocrit (%) compared to baseline
Time Frame: Days 0, 3, 5
Change in Hematocrit (%) compared to baseline
Days 0, 3, 5
Change in Hemoglobin (g/dL) compared to baseline
Time Frame: Days 0, 3, 5
Change in Hemoglobin (g/dL) compared to baseline
Days 0, 3, 5
Change is AST (U/L) compared to baseline
Time Frame: Days 0, 3, 5
Change is AST (U/L) compared to baseline; used to monitor liver function
Days 0, 3, 5
Change in ALT (U/L) compared to baseline
Time Frame: Days 0, 3, 5
Change in ALT (U/L) compared to baseline; used to monitor liver function
Days 0, 3, 5
Change in total Bilirubin (mg/dL) compared to baseline
Time Frame: Days 0, 3, 5
Change in total Bilirubin (mg/dL) compared to baseline; used to monitor liver function and red cell integrity
Days 0, 3, 5

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.
University of Mississippi, Oxford

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
University of Colorado, Denver

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Larry Walker, Ph.D., University of Mississippi Medical Center

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.
September 1, 2020

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.
September 1, 2023

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.
September 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).
August 27, 2019

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.
August 28, 2019

First Posted (Actual)

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.
August 29, 2019

Study Record Updates

Last Update Posted (Actual)

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.
November 21, 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.
November 18, 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.
November 1, 2024

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

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.
  • PQ Study 3

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

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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