Assessing a Risk Model for G6PD Deficiency

Malaria, Vivax Clinical Trial

Official title:

Developing a Methodology to Assess 8-aminoquinoline Associated Haemolytic Risk in Females Heterozygous for G6PD in Endemic Populations

Clinical Trial Details — Status: Terminated

Administrative data

• NCT number: NCT03337152
• Other study ID #: 856370-2
• Status: Terminated
• Phase: Phase 4
• Start date: May 7, 2018
• Est. completion date: October 21, 2018

Study information

• Verified date: May 2019
• Source: PATH
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

A clinical study designed to develop and inform an individual risk of hemolysis model based on individual red blood cell G6PD levels. Volunteers who are eligible to treatment with primaquine as per national guidelines and with confirmed normal G6PD levels as per the fluorescent spot test will be exposed to treatment regimens of either primaquine alone for 14 days or 3 day chloroquine with concomitant primaquine for 14 days. The volunteers will be followed intensively during treatment and for 14 days after treatment for haematologic measures, G6PD quantification, and drug level assays.

Description:

Open label, randomized trial with 72 total participants assigned to one of two treatment arms. Each arm will have 36 participants comprised of 12 males hemizygous for wildtype G6PD, 12 females homozygous for wildtype G6PD, and 12 females heterozygous for G6PD with a normal fluorescent spot test (FST) (G6PD genotype abnormal with G6PD activity ≥40% and ≤80% of normal). Arm 1a will receive primaquine for 14 days, and Arm 1b will receive chloroquine for 3 days and concomitant primaquine for 14 days. All participants will be healthy volunteers without severe G6PD deficiency who will be followed for two weeks after completing their study drug dosing. Pregnant women and those breastfeeding will be excluded. Venous blood samples will be taken at regular intervals for haematologic measures, G6PD quantification, and drug level assays. G6PD levels will be measured both by spectrophotometry to provide whole blood G6PD levels normalized for hemoglobin, as well by flow cytometry to to provide red blood cell G6PD distributions throughout the treatment and post treatment. Changes in the G6PD distributions will be modeled, incorporating other critical haematological indicators collected throughout the study too.

Recruitment information / eligibility

• Status: Terminated
• Enrollment: 54
• Est. completion date: October 21, 2018
• Est. primary completion date: August 21, 2018
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• Previous G6PD test at Shoklo Malaria Research Unit (SMRU) clinic with one of following results: 1) G6PD homozygous wildtype females (G6PD genotype normal) 2) G6PD heterozygous females with a normal FST (G6PD genotype abnormal with G6PD activity =40% and =80% of normal ) 3) G6PD hemizygous wildtype males (G6PD genotype normal)
• Willing to participate and sign informed consent form
• Willing to allow donated samples to be used in future research
• Aged =18 years
• Ability (in the investigators' opinion) and willing to comply with all study requirements Exclusion Criteria:

All participants:

• Malaria or other illness
• Recent history (within 20 days) of anti-malarial treatment
• History of allergy or adverse reaction to chloroquine or primaquine
• Blood transfusion in the past 3 months
• G6PD activity less than 40% normal activity or 3.00 IU/gHb by the quantitative G6PD spectrophotometric assay
• Haemoglobin =10 g/dL
• Presence of any condition which in the judgment of the investigator would place the subject at undue risk or interfere with the results of the study

Female participants only:

• Pregnancy at the time of screening
• Breastfeeding

Related Conditions & MeSH terms

• G6PD Deficiency
• Glucosephosphate Dehydrogenase Deficiency
• Malaria, Vivax

Intervention

Drug:
• primaquine
Participants receive primaquine for 14 days at 0.5 mg/Kg. Drug administration will be directly observed.
• chloroquine + primaquine
Participants will receive chloroquine for 3 days concomitant with primaquine for 14 days at 0.5 mg/Kg. Drug administration will be directly observed.

Locations

Country	Name	City	State
Thailand	Shoklo Malaria Research Unit (SMRU)	Mae Sot

Sponsors (2)

Lead Sponsor	Collaborator
PATH	Mahidol Oxford Tropical Medicine Research Unit

Country where clinical trial is conducted

Thailand, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Change in Haemoglobin	The change in haemoglobin from baseline on exposure to primaquine for P.vivax treatment over treatment course to hemoglobin level at day 28.	28 days after enrollment
Primary	Change in G6PD Concentration	The haemoglobin-related change in G6PD concentration, as determined by spectrometer, over treatment course.; Change is determined from baseline to day 28	28 days after enrollment
Secondary	Significance of CYP2D6	relevance of Dextromethorphan assay results to risk of haemolysis models	28 days after enrollment
Secondary	Association of Drug Levels	Association of chloroquine and primaquine drug levels at the time of sampling for haematological and G6PD profiles.	Days 1,2,3,5,7,9,11,14,17,21
Secondary	Serious Adverse Events	frequency of serious adverse events in women heterozygous for G6PD	28 days after enrollment
Secondary	Significance of Reticulocyte Count	relevance of reticulocyte count to risk of haemolysis models	Days 1,2,3,5,7,9,11,14,17,21
Secondary	Significance of Urobilinogen Levels	relevance of urobilinogen tests to risk of haemolysis models	Days 1,2,3,5,7,9,11,14,17,21