Linperlisib in the Treatment of aPRCA

NCT07031115 | Not Yet Recruiting Phase 2

• 1 other identifier: Linperlisib-PRCA
• Study Type: interventional
• Target: 15
• Locations: 1 country
• Sites: 1

Brief 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. 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). 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.

Conditions

Acquired Pure Red Cell Aplasia

Keywords

Linperlisib; Acquired Pure Red Cell Aplasia; Treatment

Outcome Measures

Primary Outcomes (4)

• Overall response rate(ORR)

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

  12weeks

• Complete response rate (CRR)

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

  12weeks

• Partial response (PR)

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

  12weeks

• No response (NR)

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

  12weeks

Secondary Outcomes (2)

• Relapse rate

  12weeks

• Adverse events

  12weeks

Study Arms (1)

Linperlisib in the Treatment of aPRCA

EXPERIMENTAL

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.

Drug: Linperlisib

Interventions

Linperlisib DRUG

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.

Linperlisib in the Treatment of aPRCA

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• 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.

You may not qualify if:

• 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.

Sponsors & Collaborators

• Peking Union Medical College Hospital: lead

Study Sites (1)

Peking Union Medical College Hospital

Beijing, Beijing Municipality, 100730, China

Location

Related Publications (10)

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

  PMID: 27881371 BACKGROUND

• 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.

  PMID: 18510682 BACKGROUND

• Mangla A, Hamad H. Pure Red Cell Aplasia. 2024 Feb 24. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. Available from http://www.ncbi.nlm.nih.gov/books/NBK549833/

  PMID: 31751023 BACKGROUND

• 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.

  PMID: 6581839 BACKGROUND

• 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.

  PMID: 17640861 BACKGROUND

• 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.

  PMID: 39888354 BACKGROUND

• 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.

  PMID: 28802037 BACKGROUND

• 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.

  PMID: 38607227 BACKGROUND

• 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.

  PMID: 32311886 BACKGROUND

• 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.

  PMID: 25807974 BACKGROUND

Central Study Contacts

Miao Chen

CONTACT

+86 18618230229; chenm@pumch.cn

Study Design

• Study Type: interventional
• Phase: phase 2
• Allocation: NA
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: SINGLE GROUP
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: June 12, 2025
• First Posted: June 22, 2025
• Study Start: September 1, 2025
• Primary Completion: December 31, 2025
• Study Completion (Estimated): December 31, 2026
• Last Updated: June 22, 2025

Record last verified: 2025-06

Data Sharing

• IPD Sharing: Will not share

Locations

CN (1)