Study to Assess the Incidence of Hemolysis, Safety, and Efficacy of Tafenoquine (SB-252263, WR238605) Versus Primaquine in Subjects With Plasmodium Vivax Malaria

Summary

This is a prospective, double-blind, double-dummy, multicenter, comparative study. A total of 300 subjects will be randomized to treatment on Day 1, of which a minimum of 50 female subjects must be enrolled that display moderate glucose-6-phosphate dehydrogenase (G6PD) deficiency (\>=40% - \<70% of the site median G6PD value). Subjects must have a blood smear that is positive for P. vivax at entry. Subjects will be randomized 2:1 to receive tafenoquine (TQ)/chloroquine(CQ) or the active comparator primaquine (PQ)/CQ. All subjects will receive CQ on Days 1 to 3, followed by TQ or PQ and matching placebo beginning on Day 1 or 2. Tafenoquine, or matching placebo, will be given as a single, 300mg dose. Subjects will receive PQ (15mg once daily) or matching placebo for 14 days. The duration of the study is 180 days, including screening and randomization to treatment (Day 1), three in-hospital days (Days 1-3), four out-patient visits while on treatment with study medication (Days 5, 8, 11 and 15) and seven follow-up visits (Days 22, 29, 60, 90, 120, 150 and 180).

The primary safety data collected in this study will help to understand the hemolysis risk to both G6PD-normal and G6PD-deficient subjects. The efficacy data produced from this study will support the results for sister study TAF112582, the pivotal phase III efficacy and safety study of the TQ program.

Conditions

• Malaria, Vivax

Interventions

DRUG

Tafenoquine

Tafenoquine will be supplied as a dark pink, capsule-shaped, film-coated tablet that is plain on both sides. Each tablet will contain 150mg TQ.

DRUG

Tafenoquine Placebo

Placebo TQ tablets will be supplied as a dark pink, capsule-shaped, film-coated tablet that is plain on both sides, with common excipients of appropriate quality.

DRUG

Chloroquine

One of two formulations of commercially available generic chloroquine may be utilized in this study: 1. tablets containing 500 mg chloroquine phosphate (equivalent to 300 mg chloroquine free base); or, 2. tablets containing 250 mg chloroquine phosphate (equivalent to 155 mg chloroquine free base).

DRUG

Primaquine

Commercially available primaquine containing primaquine phosphate united states pharmacopeia (USP), 26.3 mg (equivalent to primaquine base 15 mg) will be utilized in this study. Primaquine, a pink film-coated tablet imprinted W on one side and P97 on the other side. The PQ tablets for this study have been over-encapsulated in a Swedish orange size B supro capsule.

DRUG

Primaquine Placebo

Placebo to match PQ will be supplied as Swedish orange size B supro capsules with common excipients of appropriate quality.

Sponsors & Collaborators

• Medicines for Malaria Venture

  collaborator OTHER

• GlaxoSmithKline

  lead INDUSTRY

Principal Investigators

• GSK Clinical Trials · GlaxoSmithKline

Study Design

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

DOUBLE

Model

PARALLEL

Eligibility

Min Age

16 Years

Sex

ALL

Healthy Volunteers

No

Timeline & Regulatory

Start

2015-04-30

Primary Completion

2016-11-04

Completion

2016-11-04

Countries

• Brazil
• Colombia
• Ethiopia
• Peru
• Thailand
• Vietnam

Study Locations