Active — Not RecruitingPhase 3

A Study Evaluating the Efficacy and Safety of Mitapivat in Participants With Transfusion-Dependent Alpha- or Beta-Thalassemia (α- or β-TDT)

United States, Brazil, Bulgaria258 participantsStarted 2021-11-30

Plain-language summary

The primary objective of this study was to compare the effect of mitapivat versus placebo on transfusion burden in participants with α- or β-transfusion-dependent thalassemia.

Who can participate

Age range

18 Years

Sex

ALL

See this in plain English?

AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.

Inclusion Criteria: * Greater than or equal to (≥)18 years of age at the time of providing informed consent; * Documented diagnosis of thalassemia (β-thalassemia with or without α-globin gene mutations, hemoglobin E (HbE)/β-thalassemia, or α-thalassemia/hemoglobin H (HbH) disease) based on deoxyribonucleic acid (DNA) analysis; * Considered transfusion-dependent, defined as 6 to 20 red blood cells (RBC) units transfused and ≤6-week transfusion-free period during the 24-week period before randomization; * If taking hydroxyurea, the hydroxyurea dose must be stable for ≥16 weeks before randomization; * Women of childbearing potential (WOCBP) must be abstinent of sexual activities that may induce pregnancy as part of their usual lifestyle or agree to use two forms of contraception, one of which must be considered highly effective, from the time of providing informed consent, throughout the study, and for 28 days after the last dose of study drug. The second form of contraception can be an acceptable barrier method; * Written informed consent before any study-related procedures are conducted and willing to comply with all study procedures for the duration of the study. Exclusion Criteria: * Pregnant, breastfeeding, or parturient; * Documented history of homozygous or heterozygous sickle hemoglobin (Hb S) or hemoglobin C (Hb C); * Prior exposure to gene therapy or prior bone marrow or stem cell transplantation; * Currently receiving treatment with luspatercept; the last dose must…

Questions worth asking your doctor

Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.

1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?

Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.

Questions for the trial coordinator

The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.

1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?

A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.

What they're measuring

Double-blind Period: Percentage of Participants Who Achieved Transfusion Reduction Response (TRR)

Timeframe: Double-blind Period: Baseline through Week 48

Trial details

NCT IDNCT04770779

SponsorAgios Pharmaceuticals, Inc.

Sponsor typeINDUSTRY

Study typeINTERVENTIONAL

Primary completion2024-04-11

Results submitted2025-04-11

View on ClinicalTrials.gov More Transfusion-dependent Alpha-Thalassemia trials

Who can participate

Age range

18 Years

Sex

ALL

See this in plain English?

AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.