Assessment of Any Potential Retinal Effects of Tafenoquine (TQ)

NCT ID: NCT02658435

Last Updated: 2018-03-01

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: PHASE1
• Total Enrollment: 486 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2016-02-02
• Study Completion Date: 2017-09-14

Brief Summary

The study aims to provide evidence of retinal safety to support the use of tafenoquine as a potential single dose radical cure treatment for patients with Plasmodium vivax (P. vivax) malaria (i.e., co-administration of a schizonticidal drug with TQ). The study will be conducted as a single masked, randomized, placebo-controlled, parallel group design. It will assess retinal changes from baseline using spectral domain optical coherence tomography (OCT) and fundus auto fluorescence (FAF) at Month 3 (90 days) post-dose in adult healthy volunteers (participants). A placebo control group will be used to compare the results in the TQ group. Interim analysis will be conducted after completing 100 out of 300 participants in TQ group and 50 out of 150 participants in matched placebo.

Conditions

Malaria, Vivax

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: SINGLE

Study Groups

Tafenoquine 300 milligram (mg) single dose

Participants will receive single dose of TQ (2 tablets of 150mg) after standard meal. Participant will be randomized in a 2:1 ratio to 300mg TQ (n=300) or matched-placebo (n=150).

Group Type: EXPERIMENTAL

Tafenoquine 150 mg

Intervention Type: DRUG

Tablet contains TQ as tafenoquine succinate. The 2 tablets (2 tablets of 150mg) of dark pink, capsule-shaped, film coated will be administered orally with 240ml of water.

Matched Placebo 300mg single dose

Participants will receive single dose of matched placebo (2 tablets of 150mg) after standard meal. Participant will be randomized in a 2:1 ratio to 300mg TQ (n=300) or matched-placebo (n=150).

Group Type: PLACEBO_COMPARATOR

Matched placebo 150mg

Intervention Type: DRUG

It is the matched Placebo tablet. The 2 tablets (2 tablets of 150mg) of dark pink, capsule-shaped, film coated will be administered orally with 240ml of water.

Interventions

Tafenoquine 150 mg

Tablet contains TQ as tafenoquine succinate. The 2 tablets (2 tablets of 150mg) of dark pink, capsule-shaped, film coated will be administered orally with 240ml of water.

Intervention Type: DRUG

Matched placebo 150mg

It is the matched Placebo tablet. The 2 tablets (2 tablets of 150mg) of dark pink, capsule-shaped, film coated will be administered orally with 240ml of water.

Intervention Type: DRUG

Eligibility Criteria

Inclusion Criteria

• Between 18 and 45 years of age inclusive, at the time of signing the informed consent.
• Healthy as determined by the investigator or medically qualified designee based on a medical evaluation including medical history, brief physical examination, and laboratory tests.

Exclusion Criteria

• Body weight between >=35 kilogram (kg) and =<100kg
• Male OR Female. Female participant is eligible to participate if she is not pregnant (as confirmed by a negative [serum or urine, according to site standard] human chorionic gonadotrophin [hCG] test), not lactating, and at least one of the following conditions applies:

Non-reproductive potential defined as Pre-menopausal females with one of the following: Documented tubal ligation or Documented hysteroscopic tubal occlusion procedure with follow-up confirmation of bilateral tubal occlusion or Hysterectomy or Documented Bilateral Oophorectomy or Postmenopausal defined as 12 months of spontaneous amenorrhea in questionable cases a blood sample with simultaneous follicle stimulating hormone (FSH) and estradiol levels consistent with menopause (refer to site specific laboratory reference ranges for confirmatory levels). Females on hormone replacement therapy (HRT) and whose menopausal status is in doubt will be required to use one of the highly effective contraception methods if they wish to continue their HRT during the study. Otherwise, they must discontinue HRT to allow confirmation of post-menopausal status prior to study enrolment.

Reproductive potential and agrees to follow one of the options listed in the Modified List of Highly Effective Methods for Avoiding Pregnancy in Females of Reproductive Potential (FRP) from screening until completion of the Day 90 follow-up visit.

• Capable of giving signed informed consent which includes compliance with the requirements and restrictions listed in the consent form and in this protocol.

• Alanine Aminotransferase (ALT) and bilirubin >1.5 times Upper Limit of Normal (ULN) (isolated bilirubin >1.5 times ULN is acceptable if bilirubin is fractionated and direct bilirubin <35%).
• Current or chronic history of liver disease, or known hepatic or biliary abnormalities (with the exception of Gilbert's syndrome or asymptomatic gallstones).
• The QT interval corrected (QTc) for heart rate according to Fridericia's formula (QTcF). QTcF > 450 milli second (msec). Other calculation methods (e.g. QT interval corrected for heart rate according to Bazett's formula [QTcB], individually corrected QT interval [QTcI]) machine-read or manually over-read are not acceptable.
• Use of prescription (except female contraception and acetaminophen at doses of =<2 grams(g)/day) or non-prescription drugs, including vitamins, herbal and dietary supplements (including St John's Wort) within 7 days (or 14 days if the drug is a potential enzyme inducer) or 5 half-lives (whichever is longer) prior to the first dose of study medication, unless in the opinion of the Investigator and GSK Medical Monitor the medication will not interfere with the study procedures or compromise participant safety.
• History of regular alcohol consumption within 30 days of the study defined as: an average weekly intake of >14 drinks for males or >7 drinks for females. One drink is equivalent to 12 g of alcohol: 12 ounces (360 millilitre [mL]) of beer, 5 ounces (150 mL) of wine or 1.5 ounces (45 mL) of 80 proof distilled spirits.
• Positive results for drugs of abuse
• Cotinine levels indicative of smoking or history or regular use of tobacco- or nicotine-containing products within 30 days prior to screening.
• History of sensitivity to TQ, or components thereof or a history of drug or other allergy that, in the opinion of the investigator or Medical Monitor, contraindicates their participation.
• History of thalassaemia; or current or past history of methemoglobinemia or methemoglobin percentage above the reference range at screening.
• Lactating females.
• Presence of hepatitis B surface antigen (HBsAg), positive hepatitis C antibody test result at screening or within 3 months prior to first dose of study treatment. A positive pre-study drug/alcohol screen.
• A positive test for human immunodeficiency virus (HIV) antibody.
• Where participation in the study would result in donation of blood or blood products in excess of 500 mL within a 15 days of dosing with TQ or matched-placebo.
• The participant has participated in a clinical trial and has received an investigational product within the following time period prior to the first dosing day in the current study: 30 days, 5 half-lives or twice the duration of the biological effect of the investigational product (whichever is longer).
• Exposure to more than four new chemical entities within 12 months prior to the first dosing day
• Participants with a hemoglobin values outside the lower limit of normal range. A single repeat is allowed for eligibility determination.
• Documented phenotypic Glucose-6-phosphate dehydrogenase (G6PD) deficiency, determined by a quantitative assay of enzyme activity. Defined as <70% of locally defined median.
• A BCVA (bilateral) at screening of =<72 letters
• Eye disease that could compromise assessment of BCVA or imaging of the posterior pole by fundus photography, or spectral domain OCT, FAF, or is likely to require intervention during the 4 month (approximately) study participation (e.g. cataract, glaucoma with documented visual field loss, ischemic optic neuropathy, retinitis pigmentosa)
• History of retinal vascular disease, retinal detachment, inflammatory disease, central serous chorioretinopathy, or other retinal disease that may affect posterior retinal function or architecture.
• Vitreo-retinal interface disorders (e.g. epiretinal membrane, vitreo-macular traction) that may affect posterior retinal function or architecture
• Intraocular surgery within 3 months of dosing
• Laser photocoagulation within 3 months of dosing
• High Myopia (defined as equal to, or worse than, -6.00 diopters)
• Anterior, intermediate or posterior uveitis (active or history of) or history of significant intraocular infectious disease (e.g., conjunctivitis is not acceptable to include) or another active inflammatory disease
• An OCT central subfield thickness <250 microns or >290 microns
• Presence of significant abnormal patterns on FAF or ocular abnormalities on fundus photography at screening.
• Uncontrolled intraocular pressure >22millimetre of mercury (mmHg).

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 45 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

Medicines for Malaria Venture

OTHER

Sponsor Role: collaborator

GlaxoSmithKline

INDUSTRY

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

GSK Clinical Trials

Role: STUDY_DIRECTOR

GlaxoSmithKline

Locations

GSK Investigational Site

Glendale, California, United States

GSK Investigational Site

Overland Park, Kansas, United States

GSK Investigational Site

Baltimore, Maryland, United States

Countries

United States

References

Ackert J, Mohamed K, Slakter JS, El-Harazi S, Berni A, Gevorkyan H, Hardaker E, Hussaini A, Jones SW, Koh GCKW, Patel J, Rasmussen S, Kelly DS, Baranano DE, Thompson JT, Warren KA, Sergott RC, Tonkyn J, Wolstenholme A, Coleman H, Yuan A, Duparc S, Green JA. Randomized Placebo-Controlled Trial Evaluating the Ophthalmic Safety of Single-Dose Tafenoquine in Healthy Volunteers. Drug Saf. 2019 Sep;42(9):1103-1114. doi: 10.1007/s40264-019-00839-w.

Reference Type: DERIVED

PMID: 31187437 (View on PubMed)

Other Identifiers

201807

Identifier Type: -

Identifier Source: org_study_id