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Immune ThrombocytopeniaEarly Phase 1NCT06519565

Safety and Efficacy of PRG-1801 in Recurrent/Refractory Primary Immune Thrombocytopenia (ITP)

A Early Phase 1 study testing PRG-1801 in people with Immune Thrombocytopenia, run by Union Hospital, Tongji Medical College, Huazhong University of Science and Technology at 2 sites in China.

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
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Trial summary

This is a single center, open-label, 3+3 dose escalation, early phase 1 study to evaluate the safety, tolerability, and preliminary efficacy of PRG-1801 for patients with relapsed/refractory immune thrombocytopenia (ITP). Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
Immune Thrombocytopenia
What is being tested?
PRG-1801
Type of treatment
Injection or infusion
Could I receive a placebo?
No, everyone receives an active treatment
How many people
6 participants
Where
2 sitesChina
Study dates
20 Aug 2024to 15 Aug 2027
Phase
Early Phase 1
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • 1. Age ≥18 years, regardless of gender.
  • 2. Clinically diagnosed with primary immune thrombocytopenia for at least 6 months, with a platelet count <30×10^9/L within 48 hours before participating in the study.
  • 3. Positive for anti-platelet glycoprotein autoantibodies (such as GPIIb/IIIa).
  • 4. Previously received first-line and/or second-line ITP treatment (first-line treatment includes: corticosteroids or immunoglobulins; second-line treatment includes thrombopoietin receptor agonists (such as eltrombopag, romiplostim) and/or rituximab, etc.), but the treatment was ineffective (platelet count <30×10^9/L after treatment, or platelet count did not increase to twice the baseline value, or there was bleeding), or relapsed after effective treatment (platelet count dropped below 30×10^9/L after effective treatment, or dropped to less than twice the baseline value, or bleeding symptoms occurred) or difficult to maintain after stopping TPO receptor agonists.
  • 5. Basic normal function of important organs:
  • Echocardiography indicates an ejection fraction ≥50%, and the electrocardiogram shows no significant abnormalities.
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  • Creatinine clearance rate (CrCl) (Cockcroft-Gault formula) ≥30 mL/min.
  • Alanine transaminase (ALT) and aspartate transaminase (AST) ≤3.0× the upper limit of normal (ULN).
  • Total bilirubin (TBIL) and alkaline phosphatase (AKP or ALP) ≤2.0×ULN (Gilbert's syndrome ≤ 3.0×ULN).
  • Absolute lymphocyte count (ALC) ≥0.5×10^9/L; absolute neutrophil count (ANC) ≥1×10^9/L; hemoglobin (Hb) ≥60 g/L; platelet count ≥10×10^9/L.
  • Blood oxygen saturation >92%.
  • 6. Meet the standards for apheresis or venous blood collection, and have no contraindications to cell collection.
  • 7. Men of reproductive potential and women of childbearing age must agree to use effective contraception from the signing of the informed consent form until 1 year after the use of the study drug. Blood pregnancy tests for women of childbearing age must be negative at screening and before cell infusion, and they must not be breastfeeding.
  • 8. The participant or their guardian agrees to participate in this clinical trial and signs the informed consent form (ICF), indicating their understanding of the purpose and procedures of this clinical trial and their willingness to participate in the study.

Who cannot join

  • 1. Thrombocytopenia caused by myelodysplastic syndromes, early aplastic anemia, atypical aplastic anemia, thrombotic thrombocytopenic purpura, etc.
  • 2. Bone marrow examination during the screening period suggests myelofibrosis MF≥2 (European consensus scoring standard Thieleja2005) or bone marrow examination indicates the presence of primary diseases other than ITP that can cause thrombocytopenia.
  • 3. Allergic history to any component in the cell product.
  • 4. Suffering from any of the following heart diseases:
  • Congestive heart failure of NYHA class III or IV.
  • Myocardial infarction or coronary artery bypass grafting (CABG) or coronary stent implantation within ≤6 months before signing the ICF.
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  • Clinically significant ventricular arrhythmias, or history of unexplained syncope (excluding vasovagal syncope or dehydration).
  • Severe non-ischemic cardiomyopathy history.
  • 5. Malignant tumors within the past 3 years before screening, except for the following: malignant tumors that have been treated radically and have no known active disease for ≥3 years before enrollment; or well-treated non-melanoma skin cancer with no evidence of disease.
  • 6. Symptomatic deep vein thrombosis or pulmonary embolism within the past 6 months or currently requiring anticoagulant therapy.
  • 7. Participation in other interventional clinical studies within 1 month before screening.
  • 8. Vaccination with attenuated live vaccines within 4 weeks before screening.
  • 9. Stroke or epileptic seizure within 6 months before signing the ICF (excluding old lacunar cerebral infarction).
  • 10. The following treatments before CAR-T reinfusion: immunosuppressive treatment within 3 days; use of prednisone (or equivalent drugs) at a dose >10mg/day within 3 days.
  • 11. The following treatments before CAR-T reinfusion: treatment with B-cell depleting agents such as rituximab within 24 weeks (unless B cells have recovered); immunoglobulin reinfusion treatment within 4 weeks.
  • 12. Positive for hepatitis B surface antigen (HBsAg) or hepatitis B core antibody (HBcAb) and peripheral blood hepatitis B virus (HBV) DNA titer detection exceeds the normal range; positive for hepatitis C virus (HCV) antibody and peripheral blood hepatitis C virus (HCV) RNA titer detection exceeds the normal range; positive for human immunodeficiency virus (HIV) antibody; positive syphilis test.
  • 13. Other conditions deemed unsuitable for participation in the study by the researcher.

Trial locations and contacts

2 sites in 1 country. Contact the study team or a site near you to ask about taking part.

Heng Mei, Ph.D&M.D contact

027-8572600

hmei@hust.edu.cn

Jinhui Shu, Ph.D contact

18326016087

sjh18326016087@163.com

China2 sites, 2 recruiting
  • Union Hospital, Tongji Medical College, Huazhong University of Science and Technology

    Wuhan, Hubei, 430022

    Heng Mei, Ph.D&M.D., hmei@hust.edu.cn

    Not yet recruiting
  • Union Hospital, Tongji Medical College, Huazhong University of Science and Technology

    Wuhan, Hubei, 430022

    Heng Mei, 07596503286, hmei@hust.edu.cn

    Jinhui Shu, 18326016087, sjh18326016087@163.com

    Recruiting

Other trials in China

About this study

Official title: Clinical Study on the Safety and Efficacy of PRG-1801 for the Treatment of Recurrent/Refractory Primary Immune Thrombocytopenia (ITP)

This is a single center, open-label, 3+3 dose escalation, early phase 1 study to evaluate the safety, tolerability, and preliminary efficacy of PRG-1801 for patients with relapsed/refractory immune thrombocytopenia (ITP).

Read the detailed description

This investigator-initiated clinical study aims to evaluate PRG-1801, a BCMA-targeted CAR-T cell therapy, in patients with relapsed refractory immune thrombocytopenia (ITP). The study employs a dose-escalation design to assess safety, tolerability, and preliminary efficacy.

Approximately 1 sites are planned to be selected for the clinical trial. The subjects, who sign the informed consent forms and been screened by inclusion/exclusion criteria, will be assigned into 100×10^6, and 200×10^6 CAR-T cells groups in order of sequence. And the subjects will undergo leukapheresis, lymphodepletion pre-treatment, and a single infusion of PRG-1801. Dose escalation will follow 3 + 3 design and 3-6 subjects in each group will complete a single dose. Within the same dose group, the next subject will be administered after the previous subject has completed at least 14 days of safety observation. After the last subject in each dose group has completed the dose-limiting toxicity (DLT) assessment window of 28 days after single dose, the enrollment and treatment for the next dose group may be initiated after the Safety Review Committee (SRC) agrees to enter the next dose group based on clinical safety data assessment.

When DLT occurs in 1 of 3 subjects in a dose group, 3 additional subjects in the same dose group will be required (up to 6 subjects in the dose group have completed DLT assessment): if no DLT occurs in the additional 3 subjects, dose escalation will continue; if 1 of the 3 additional subjects experiences one DLT, dose escalation will be discontinued; if more than 1 of the 3 additional subjects experiences DLTs, dose escalation will be discontinued, and 3 additional subjects will be required to be enrolled at one lower dose level for DLT assessment. After the end of escalation for the maximum dose group, if no MTD is observed, the highest dose level is defined as the MTD

Being tested
PRG-1801
Medical subject headings
Purpura, Thrombocytopenic, Idiopathic

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • PRG-1801Drug

    Also called BCMA-targeting CAR-T Cells

    PRG-1801 is a chimeric antigen receptor T-cell (CAR-T) therapy targeting BCMA. Participants will undergo leukapheresis to collect mononuclear cells for PRG-1801 manufacturing. Prior to infusion, patients receive lymphodepletion with cyclophosphamide (250-300 mg/m2/day) and fludarabine (25-30 mg/m2/day) for 3 days. PRG-1801 is then administered as a single intravenous infusion at one of three dose levels: 100×10^6, or 200×10^6 CAR-T cells. Premedication with antipyretics and antihistamines is given 30-60 minutes before infusion. The infusion rate is 2-5 ml/min. Patients are monitored for safety and efficacy for up to 24 months post-infusion. Some patients may be eligible for a second infusion if they respond initially but later relapse.

Study groups in NCT06519565
Study groupRoleWhat they receive
PRG-1801(BCMA-targeting CAR-T Cells)ExperimentalThe study was structured into two distinct phases: the dose exploration phase and the dose expansion phase. During the dose exploration phase, three dosage levels were established-100x10^6 CAR-T and 200x10^6 CAR-T-with each dosage group comprising 3 to 6 subjects with Immune Thrombocytopenia (ITP). If dose-limiting toxicity (DLT) was observed in one out of three subjects within any dosage group, an additional three subjects were enrolled at the same dosage level. Should DLT be present in two or more out of six subjects, considerations for dose reduction or potential study discontinuation were made. Upon determining the safe and effective fixed dose of PRG-1801 during the dose exploration phase, the study progressed to the dose expansion phase. This subsequent phase involved enrolling an additional 3 to 6 subjects at the established fixed dose. The aim was to further assess and confirm the safety and efficacy of this specific dose for treating ITP.
Receives: Drug: PRG-1801

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Incidence of Treatment-related Adverse Events

    Therapy-related adverse events (AE), including severe adverse events (SAE) and laboratory outliers with clinical significance, will be recorded and assessed according to the Common Terminology Criteria for Adverse Events (CTCAE, Version 5.0)

    Measured: Up to 28 days post-infusion

  2. The safe dosage for a single infusion of PRG-1801

    The safe PRG-1801 infusion dosage for ITP patients will be evaluated by comprehensively assessing the complete response (CR) rate and the incidence of adverse events (AEs).

    Measured: Up to 28 days post-infusion

Secondary outcomes (3)
  1. Complete response (CR) rate or Response (R) rate of administering PRG-1801 in the treatment of relapsed/refractory ITP

    CR is defined as platelet count ≥100×10^9/L. R is defined as platelet count ≥30×10^9/L and at least doubling from baseline, without active bleeding.

    Measured: At Day 28, Month 2, Month 3, Month 6,Month 9, Month 12, Month 18, and Month 24 post-infusion

  2. The proliferation rate and persistence time of CAR-T cells

    Evaluation of CAR-T cell expansion and persistence through measurement of CAR copy number in peripheral blood

    Measured: At baseline, Day 2, Day 6, Day 10, Day 14, Day 21, Day 28, Month 2, Month 3, Month 6, Month 9, Month 12, Month 18, and Month 24 post-infusion

  3. Concentration of serum sBCMA, immunoglobulins (IgG, IgM, IgA), and anti-platelet glycoprotein autoantibodies

    Pharmacodynamics of PRG-1801 were assessed by evaluating changes from baseline in serum sBCMA, immunoglobulins (IgG, IgM, IgA), and anti-platelet glycoprotein autoantibodies

    Measured: At baseline, Day 28, Month 2, Month 3, Month 6,Month 9, Month 12, Month 18, and Month 24 post-infusion

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted25 Jul 2024
  2. Study start20 Aug 2024
  3. Primary completion15 Dec 2026 (estimated)
  4. Study completion15 Aug 2027 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Early Phase 1
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Model description
PRG-1801 Injection
Masking
None (open label)
Enrolment
6 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT06519565
Sponsor's protocol ID
PRG1801E13
Status last verified
Dec 2024
First submitted
9 Jul 2024
Last updated
28 Nov 2025
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Publications

  • Shu J, Xu M, Li P, Xie W, Liu L, Li H, Bussel JB, Hu Y, Mei H. BCMA-directed CAR T-cell therapy induces durable drug-free remission in refractory primary immune thrombocytopenia. Blood. 2026 Oct 29;148(18):2306-2312. doi: 10.1182/blood.2026035047.

    PubMed 42498681

Questions about this trial

What is this clinical trial studying?

A Early Phase 1 study testing PRG-1801 in people with Immune Thrombocytopenia, run by Union Hospital, Tongji Medical College, Huazhong University of Science and Technology at 2 sites in China.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 14 inclusion and 17 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: looking for participants now, as of the sponsor's last update on 28 Nov 2025. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 2 sites in China. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Early Phase 1 (sometimes called Phase 0) studies give a very small amount of a treatment to a few people, mainly to see how the body handles it.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Heng Mei, Ph.D&M.D (027-8572600, hmei@hust.edu.cn), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Incidence of Treatment-related Adverse Events (time frame: Up to 28 days post-infusion). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT06519565, which also lists 1 linked publication.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 28 Nov 2025.

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