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Acquired Pure Red Cell AplasiaPhase 2NCT07031115

Linperlisib in the Treatment of aPRCA

A Phase 2 study testing Linperlisib in people with Acquired Pure Red Cell Aplasia, run by Peking Union Medical College Hospital at 1 site in China.

Withdrawn

Withdrawn. The study stopped before anyone enrolled.

Official record
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Trial summary

Pure red cell aplasia (PRCA) is a syndrome characterized by normocytic normochromic anemia, reticulocytopenia, and reduced erythroid precursors in an otherwise normocellular bone marrow. It primarily affects erythropoiesis, while granulocytic and megakaryocytic lineages typically remain unaffected. Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
Acquired Pure Red Cell Aplasia
What is being tested?
Linperlisib
Type of treatment
Pill or oral medicine
Could I receive a placebo?
No, everyone receives an active treatment
How many people
0 participants
Where
1 siteChina
Study dates
30 Oct 2026to 30 Oct 2026
Phase
Phase 2
Are there results?
None posted in the registry

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

  • Age ≥ 18 years;
  • Patients meeting the diagnostic criteria for acquired PRCA;
  • Patients who are relapsed or refractory after at least two lines of prior therapy. Refractory is defined as failure to achieve partial remission after 3 months of treatment at a stable dose of immunosuppressive agents.
  • Hb ≤ 100 g/L;
  • Patients with complete clinical data, demonstrated good treatment compliance, and who have signed the informed consent form;
  • If taking glucocorticoids, must have discontinued them or been on a stable low maintenance dose (prednisone ≤ 15 mg/day) for at least 2 weeks prior to enrollment, and continue this dose;
  • If taking immunosuppressive agents such as cyclosporine or sirolimus, must have been on a stable dose for at least 3 months, and discontinue them upon enrollment.

Who cannot join

  • Patients with organ dysfunction (e.g., heart, liver, or lung) or acute renal insufficiency;
  • Patients who have used PI3Kδ inhibitors within the past 6 months;
  • Patients with severe infectious diseases;
  • Patients with malignant tumors;
  • Patients with psychiatric disorders or cognitive impairment;
  • Pregnant or lactating women;
  • Patients who have participated in other clinical trials within the past 3 months.

Trial locations and contacts

1 site in 1 country.

China1 site
  • Peking Union Medical College Hospital

    Beijing, Beijing Municipality, 100730

Other trials in China

About this study

Official title: Linperlisib in Acquired Pure Red Cell Aplasia: a Single-arm,Cphase II Prospective Clinical Study

Pure red cell aplasia (PRCA) is a syndrome characterized by normocytic normochromic anemia, reticulocytopenia, and reduced erythroid precursors in an otherwise normocellular bone marrow. It primarily affects erythropoiesis, while granulocytic and megakaryocytic lineages typically remain unaffected. First-line therapies for PRCA include corticosteroids (CS) and cyclosporine A(CsA). Although CS demonstrates high response rates, relapse frequently occurs upon dose reduction or discontinuation. CsA achieves response rates of 65%-87%, yet exhibits a delayed onset of action, often requiring 2-3 months to achieve transfusion independence. Sirolimus constitutes a second-line option, with additional therapeutic agents including methotrexate and cyclophosphamide.

Phosphatidylinositol 3-kinases (PI3Ks) represent a family of lipid kinases. The δ and γ isoforms are predominantly expressed in leukocytes and are frequently activated in various B-cell lymphomas, serving as the primary therapeutic targets for currently approved PI3K inhibitors in hematological malignancies. PI3K also plays a critical role in modulating cells of both the adaptive and innate immune systems. Studies indicate that engagement of multiple immune receptors on leukocytes triggers PI3K activation. Consequently, isoform-selective (δ or γ) or dual δ/γ inhibitors are being investigated for autoimmune conditions such as COPD, asthma, allergies, and Sjögren's syndrome. Leniolisib, the first oral PI3Kδ inhibitor approved by the FDA for immunodeficiency, exemplifies this therapeutic strategy. Several other PI3K-targeting agents are under clinical evaluation, including Parsaclisib (Phase II trial in relapsed/refractory autoimmune hemolytic anemia) and Linperlisib (Phase I trial in relapsed/refractory AIHA).

Read more

T-lymphocyte dysfunction is a pivotal factor in PRCA pathogenesis. RNA sequencing analyses have revealed significant upregulation of genes associated with the PI3K/AKT/mTOR pathway in bone marrow CD8+ T lymphocytes of patients with acquired PRCA, suggesting that targeting this pathway may represent a novel therapeutic strategy. Linperlisib, a highly selective PI3Kδ inhibitor approved for relapsed/refractory follicular lymphoma, suppresses PI3Kδ protein expression and reduces AKT phosphorylation, thereby inducing apoptosis and inhibiting lymphocyte proliferation. In 2024, a seminal report documented rapid responses and manageable tolerability with Linperlisib in four patients with acquired PRCA.

Currently, no cohort studies have been conducted on Linperlisib for PRCA treatment. This study seeks to characterize the dosing regimen, efficacy, and safety profile of Linperlisib in relapsed/refractory pure red cell aplasia.

Being tested
Linperlisib
Keywords
Linperlisib, Acquired Pure Red Cell Aplasia, Treatment

What participants receive

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

  • LinperlisibDrug

    Linperlisib 40 mg, orally, once daily. Following 2 weeks of treatment, efficacy was assessed. If the reticulocyte count remained <20×10⁹/L, the dose was escalated to 60 mg, once daily. After an additional 2 weeks of therapy, a second efficacy assessment was performed. Patients failing to achieve partial response (PR) underwent further dose escalation to 80 mg, once daily. Treatment was discontinued if PR was not attained after 8 weeks at the maximum dose. Responding patients maintained therapy at their effective dose level. The core study period comprised 12 weeks, with responders continuing treatment at the investigator's discretion.

Study groups in NCT07031115
Study groupRoleWhat they receive
Linperlisib in the Treatment of aPRCAExperimentalLinperlisib 40 mg, orally, once daily. Following 2 weeks of treatment, efficacy was assessed. If the reticulocyte count remained <20×10⁹/L, the dose was escalated to 60 mg, once daily. After an additional 2 weeks of therapy, a second efficacy assessment was performed. Patients failing to achieve partial response (PR) underwent further dose escalation to 80 mg, once daily. Treatment was discontinued if PR was not attained after 8 weeks at the maximum dose. Responding patients maintained therapy at their effective dose level. The core study period comprised 12 weeks, with responders continuing treatment at the investigator's discretion.
Receives: Drug: Linperlisib

What is being measured

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

  1. Overall response rate(ORR)

    ORR defined as the proportion of patients who met the criteria of either complete response (CR) or partial responce (PR).

    Measured: 12weeks

  2. Complete response rate (CRR)

    CRR defined as the proportion of patients who met the criteria of complete response.

    Measured: 12weeks

  3. Partial response (PR)

    PR defined as the patients who met the criteria of partial responce.

    Measured: 12weeks

  4. No response (NR)

    NR defined as the patients who had transfusion dependence or failed to achieve PR.

    Measured: 12weeks

Secondary outcomes (2)
  1. Relapse rate

    Relapse rate defined as the proportion of patients whose response shift from PR or CR to NR

    Measured: 12weeks

  2. Adverse events

    Safety analyses include the incidence, severity grading, and dose relationship of adverse events, along with the proportion of treatment discontinuations or dose reductions due to toxicity. All adverse events that occurred or worsened during the treatment period will be reported, including those occurred later but are considered by the investigator to be related to the trial drug.

    Measured: 12weeks

Timeline

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

  1. First posted22 Jun 2025
  2. Study start30 Oct 2026
  3. Primary completion30 Oct 2026
  4. Study completion30 Oct 2026

Why it stopped: The manufacturing enterprise has stopped the supply of drugs

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
Phase 2
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrolment
0 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07031115
Sponsor's protocol ID
Linperlisib-PRCA
Status last verified
Oct 2026
First submitted
12 Jun 2025
Last updated
2 Nov 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Publications

  • Means RT Jr. Pure red cell aplasia. Blood. 2016 Nov 24;128(21):2504-2509. doi: 10.1182/blood-2016-05-717140.

    PubMed 27881371
  • Sawada K, Fujishima N, Hirokawa M. Acquired pure red cell aplasia: updated review of treatment. Br J Haematol. 2008 Aug;142(4):505-14. doi: 10.1111/j.1365-2141.2008.07216.x. Epub 2008 May 28.

    PubMed 18510682
  • Mangla A, Hamad H. Pure Red Cell Aplasia. 2024 Feb 24. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Available from http://www.ncbi.nlm.nih.gov/books/NBK549833/

    PubMed 31751023
  • Clark DA, Dessypris EN, Krantz SB. Studies on pure red cell aplasia. XI. Results of immunosuppressive treatment of 37 patients. Blood. 1984 Feb;63(2):277-86.

    PubMed 6581839
  • Sawada K, Hirokawa M, Fujishima N, Teramura M, Bessho M, Dan K, Tsurumi H, Nakao S, Urabe A, Omine M, Ozawa K; PRCA Collaborative Study Group. Long-term outcome of patients with acquired primary idiopathic pure red cell aplasia receiving cyclosporine A. A nationwide cohort study in Japan for the PRCA Collaborative Study Group. Haematologica. 2007 Aug;92(8):1021-8. doi: 10.3324/haematol.11192. Epub 2007 Jul 20.

    PubMed 17640861
  • Liu Y, Liu M, He X, Yang L, Zhang M, Tang P, Xing L, Niu H, Wang H. Molecular landscape of CD8+ T cells in pure red cell aplasia. Ann Hematol. 2025 Feb;104(2):953-961. doi: 10.1007/s00277-025-06220-5.

    PubMed 39888354
  • Fruman DA, Chiu H, Hopkins BD, Bagrodia S, Cantley LC, Abraham RT. The PI3K Pathway in Human Disease. Cell. 2017 Aug 10;170(4):605-635. doi: 10.1016/j.cell.2017.07.029.

    PubMed 28802037
  • Wang Z, Jiang B, Song L, Sun M, Li C, Li X, Zheng W, Tao Y, Sun Q, Qi J. Patients with acquired pure red cell aplasia respond to PI3Kdelta inhibitor rapidly. Am J Hematol. 2024 Jul;99(7):1431-1433. doi: 10.1002/ajh.27325. Epub 2024 Apr 12. No abstract available.

    PubMed 38607227
  • Red Blood Cell Disease (Anemia) Group, Chinese Society of Hematology, Chinese Medical Association. [Chinese expert consensus on the diagnosis and treatment of acquired pure red cell aplasia (2020)]. Zhonghua Xue Ye Xue Za Zhi. 2020 Mar 14;41(3):177-184. doi: 10.3760/cma.j.issn.0253-2727.2020.03.001. No abstract available. Chinese.

    PubMed 32311886
  • Hirokawa M, Sawada K, Fujishima N, Teramura M, Bessho M, Dan K, Tsurumi H, Nakao S, Urabe A, Fujisawa S, Yonemura Y, Kawano F, Oshimi K, Sugimoto K, Matsuda A, Karasawa M, Arai A, Komatsu N, Harigae H, Omine M, Ozawa K, Kurokawa M; PRCA Collaborative Study Group. Long-term outcome of patients with acquired chronic pure red cell aplasia (PRCA) following immunosuppressive therapy: a final report of the nationwide cohort study in 2004/2006 by the Japan PRCA collaborative study group. Br J Haematol. 2015 Jun;169(6):879-86. doi: 10.1111/bjh.13376. Epub 2015 Mar 25.

    PubMed 25807974

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing Linperlisib in people with Acquired Pure Red Cell Aplasia, run by Peking Union Medical College Hospital at 1 site 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 7 inclusion and 7 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: withdrawn, as of the sponsor's last update on 2 Nov 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site 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?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

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

Are results available for this study?

The study was withdrawn before enrolling participants, so there are no results.

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

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Overall response rate(ORR) (time frame: 12weeks). The study lists 4 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 NCT07031115, which also lists 10 linked publications.

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 2 Nov 2026.

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