A Phase 2A Study of a Novel Antimalarial Pyrrolidinamide in Adult Patients With Uncomplicated P. Falciparum Malaria

A Phase 2A Study to Evaluate the Safety, Tolerability, and Pharmacokinetics of a Novel Antimalarial Pyrrolidinamide at Different Doses and Dose Durations, in Adult Patients With Uncomplicated P. Falciparum Malaria

The study will evaluate the safety and efficacy of a new antimalarial drug GSK3772701 (a pyrrolidinamide), using different doses and treatment durations, in adult participants with uncomplicated Plasmodium (P.) falciparum malaria.

Study Overview

• Status: Not yet recruiting
• Conditions: Malaria, Falciparum
• Intervention / Treatment: Drug: GSK3772701 600 mg; Drug: GSK3772701 900 mg; Drug: GSK3772701 150 mg; Drug: GSK3772701 400 mg; Drug: GSK3772701 50 mg

• Study Type: Interventional
• Enrollment (Estimated): 70
• Phase: Phase 2

Contacts and Locations

• Study Contact: Name: US GSK Clinical Trials Call Center; Phone Number: 877-379-3718; Email: GSKClinicalSupportHD@gsk.com
• Study Contact Backup: Name: EU GSK Clinical Trials Call Center; Phone Number: +44 (0) 20 89904466; Email: GSKClinicalSupportHD@gsk.com

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Male and female patients aged 18 to 65 years.

• Presence of malaria due to mono-infection with P. falciparum confirmed by:

  • Fever, as defined by axillary temperature >=37.5°C or oral/tympanic temperature >=38°C and,
  • Microscopically confirmed P. falciparum malaria parasite mono-infection,
  • A parasite count between 2,000 to 60,000 asexual parasite count/µL of blood for P. falciparum.
• Have a BMI between >=18 and <=30 kg/m2.
• Able to swallow oral medication.
• Signed informed consent, acknowledging understanding and willingness to comply with the requirements of the study. If the patient is unable to write, thumb print consent, signed by an impartial witness is permitted according to local ethical considerations.
• Contraceptive use by women should be consistent with local regulations regarding the methods of contraception for those participating in clinical studies.

• A female participant is eligible to participate if she is not pregnant or breastfeeding, and one of the following conditions applies:

  • Is a woman of non-childbearing potential (WONCBP) or
  • Is a woman of childbearing potential (WOCBP) and using an acceptable contraceptive method, from Study Day 1, and during the study intervention period (40 +/-3 days).

Exclusion Criteria:

• Patients with signs and symptoms of severe/complicated malaria according to the WHO 2024 Criteria.
• Mixed Plasmodium infection, i.e., infection with more than one malaria (plasmodium) species (by microscopy; participant to be withdrawn from study treatment if PCR subsequently indicates presence of mixed infection).
• Abnormal values: QTcF >450 msec or QTcF >480 msec for patients with bundle branch block.
• Any clinically significant ECG abnormalities at Screening unrelated to malaria (including but not limited to, second degree AV block (Mobitz Type 2), complete heart block, ST changes, atrial fibrillation, atrial flutter, supraventricular tachycardia, ventricular tachycardia, prolonged QT interval.
• History of malignancy (or current malignancy) of any organ system (other than localized carcinoma of the skin), treated or untreated, within the past 5 years, regardless of whether there is evidence of local recurrence or metastases.
• Creatinine >=2 x ULN.
• Significant illness within two weeks prior to screening.
• Positive HIV antibody test at screening, or history of HIV infection based on past positive test result, clinical record or current treatment.
• Severe vomiting, defined as more than 3 times in the 24 hours before screening or inability to tolerate oral treatment.
• Severe diarrhoea defined as more than 3 watery stools per day in the 24 hours before screening.
• Known history or evidence (based on clinical examination or investigation) of uncontrolled active cardiovascular disease (including hypertension), respiratory disease (including active tuberculosis even if treatment is ongoing), liver cirrhosis or liver disease (based on prior investigation, clinical signs and/or interpretation of liver enzymes), other active hepatic, renal, gastrointestinal, immunological, neurological, endocrine, infectious, or psychiatric disease.
• Anaemia (Hb <=8.0g/dl) or known clinically important chronic underlying haematological disease such as sickle cell disease at screening.
• Significant chronic medical conditions which in the opinion of the investigator preclude enrolment into the study.
• Have received any antimalarial treatment in the preceding 6 weeks (see Section 6.10), as determined by history or medical record.
• Prior enrolment in this study and receipt of treatment with GSK3772701.
• Use of other investigational drugs at the time of enrolment, or within 6 weeks, or 5 half-lives prior to enrolment into this study, whichever is longer; or longer if required by local regulations, and for any other limitation of participation in an investigational trial based on local regulations.
• History of hypersensitivity to the study drug or drug formulation and capsule (Hypromellose (hydroxypropyl methylcellulose)) constituents.
• History of drug or alcohol abuse within 3 months prior to dosing, or clinical evidence of such abuse.
• Participants who in the opinion of the Investigator are unsuitable for participation in the study or cannot be enrolled due to logistical reasons.
• ALT >2.0 x ULN.
• Total bilirubin >1.5 x ULN; Participants with Gilbert's syndrome can be included with total bilirubin >1.5xULN as long as direct bilirubin is <=1.5xULN.
• Current or chronic history of liver disease or known hepatic or biliary abnormalities (with the exception of Gilbert's syndrome or asymptomatic gallstones).
• Presence of hepatitis B surface antigen (HBsAg) at screening or within 3 months prior to first dose of study intervention.
• Positive hepatitis C antibody test result at screening or within 3 months prior to first dose of study intervention.

Note: Participants with positive hepatitis C antibody due to prior resolved disease can be enrolled, only if a confirmatory negative Hepatitis C RNA test is obtained.

• Positive hepatitis C RNA test result at screening or within 3 months prior to first dose of study intervention.

Note: Test is optional and participants with negative Hepatitis C antibody test are not required to also undergo Hepatitis C RNA testing.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Sequential Assignment
• Masking: None (Open Label)

Number of Arms

5

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Cohort 1_Single Dose; Participants receive a single GSK3772701 600 mg dose on Day 1.	Drug: GSK3772701 600 mg; A 600 mg dose of GSK3772701 administered orally, as 4 capsules of 150 mg.
Experimental: Cohort 2_ Single Dose; Participants receive a single GSK3772701 900 mg dose on Day 1.	Drug: GSK3772701 900 mg; A 900 mg dose of GSK3772701 administered orally, as 6 capsules of 150 mg.
Experimental: Cohort 3_ Repeat Dose; Participants receive a daily 150 mg dose of GSK3772701 on Day 1 and Day 2.	Drug: GSK3772701 150 mg; A daily 150 mg dose of GSK3772701 administered orally on Day 1 and Day 2, as 1 capsule.
Experimental: Cohort 4_ Repeat Dose; Participants receive a daily 400 mg dose of GSK3772701 on Day 1 and Day 2.	Drug: GSK3772701 400 mg; A daily 400 mg dose of GSK3772701 administered orally on Day 1 and Day 2, as 2 capsules of 150 mg and 1 capsule of 100 mg.
Experimental: Cohort 5_ Repeat Dose; Participants receive a daily 50 mg dose of GSK3772701 on Day 1, Day 2 and Day 3.	Drug: GSK3772701 50 mg; A daily 50 mg dose of GSK3772701 administered orally on Day 1, Day 2 and Day 3, as 1 capsule.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Number of participants with serious adverse events (SAEs) overall, treatment related, and by severity	A SAE is defined as any untoward medical occurrence that, at any dose: results in death, is life threatening, requires hospitalization or prolongation of existing hospitalization, results in disability/incapacity, is a congenital anomaly/birth defect in the offspring of a study participant; abnormal pregnancy outcomes; or any other situation according to medical or scientific judgment. The intensity of SAEs is assessed as per the Division of Acquired Immunodeficiency Syndrome (DAIDS) criteria Version 2.1 where grades are defined based on numeric criteria as follows Grade 1: mild; Grade 2: moderate; Grade 3: severe; Grade 4: potentially life-threatening; Grade 5: death. A higher grade indicates greater severity. Any = occurrence of the event regardless of intensity grade and treatment relationship. Treatment related = occurrence of the event which, in the investigator's opinion, is related to the administered treatment regardless of the intensity grade.	From the date of informed consent signing (up to 24 hours prior to Day 1) up to Day 40 (end of the follow-up period)
Number of participants with non-serious AEs overall, treatment related, and by severity	An AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of a study intervention, whether or not considered related to the study intervention. The intensity of non-serious AEs is assessed using the DAIDS criteria Version 2.1 where grades are defined based on numeric criteria as follows Grade 1: mild; Grade 2: moderate; Grade 3: severe; Grade 4: potentially life-threatening; Grade 5: death. A higher grade indicates greater severity. Any = occurrence of the event regardless of intensity grade and treatment relationship. Treatment related = occurrence of the event which, in the investigator's opinion, is related to the administered treatment regardless of the intensity grade.	From Day 1 up to Day 40

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Area under the concentration (AUC) - time curve (AUC[0-t]) of GSK3772701	AUC(0-t) is defined as the area under the concentration-time curve from time zero to the time of the last evaluable concentration.	From Day 1 to Day 7
AUC(0-t) extrapolated to infinity (AUC[0-inf]) of GSK3772701	AUC(0-inf) is defined as the area under the concentration-time curve extrapolated to infinity calculated as: . AUC(0-inf) = AUC(0-t) + C(t) / λz.	From Day 1 to Day 7
Maximum observed concentration (Cmax) of GSK3772701		From Day 1 to Day 7
Time to maximum observed drug concentration (Tmax) of GSK3772701	Tmax is defined as time to reach the Cmax.	From Day 1 to Day 7
Apparent terminal half-life (t1/2) of GSK3772701	Apparent terminal phase half-life in plasma (and blood), calculated as loge (2)/λz.	From Day 1 to Day 7
Trough concentration (Ctau) of GSK3772701 following multiple dose administration	Ctau is defined as the trough/pre-dose concentration after dosing interval, tau.	From Day 2 to Day 7
Observed accumulation ratio (R) of GSK3772701 for AUC [AUC(Ro)] following multiple dose administration	AUC-tau (Ro) is defined as the accumulation ratio for AUC(0-tau) comparing last day of dosing to Day 1.	From Day 2 or Day 3 to Day 7, compared to Day 1
Observed accumulation ratio of GSK3772701 based on Cmax (RCmax) following multiple doses	Cmax (RCmax) is defined as the accumulation ratio for Cmax comparing last day of dosing to Day 1.	From Day 2 or Day 3 to Day 7, compared to Day 1

Collaborators and Investigators

• Sponsor: GlaxoSmithKline

Study record dates

Study Major Dates

• Study Start (Estimated): April 20, 2026
• Primary Completion (Estimated): July 22, 2027
• Study Completion (Estimated): July 22, 2027

Study Registration Dates

• First Submitted: April 16, 2026
• First Submitted That Met QC Criteria: April 16, 2026
• First Posted (Actual): April 22, 2026

Study Record Updates

• Last Update Posted (Actual): April 22, 2026
• Last Update Submitted That Met QC Criteria: April 16, 2026
• Last Verified: April 1, 2026

More Information

Terms related to this study

• Keywords: Malaria; Plasmodium falciparum; Antimalarial drug; GSK3772701
• Additional Relevant MeSH Terms: Vector Borne Diseases; Mosquito-Borne Diseases; Infections; Protozoan Infections; Parasitic Diseases; Malaria; Malaria, Falciparum
• Other Study ID Numbers: 223257

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: YES
• IPD Plan Description: GSK will assess requests from qualified researchers for anonymized individual patient-level data and related study documents. Data sharing is subject to certain criteria, conditions, and exceptions. For further information, refer to https://www.gsk-studyregister.com/About_GSK_Patient_Level_Data_Sharing_Final_13July2023.pdf.
• IPD Sharing Time Frame: Anonymized IPD will be made available within 6 months of publication of primary, key secondary and safety results for studies in product with approved indication(s) or asset(s) with development terminated across all indications.
• IPD Sharing Access Criteria: Anonymized IPD is shared with researchers whose proposals are approved by an Independent Review Panel and after a Data Sharing Agreement is in place. Access is provided for an initial period of 12 months, but an extension may be granted, when justified, for up to 6 months.
• IPD Sharing Supporting Information Type: STUDY_PROTOCOL; SAP; ICF; CSR

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No