Effect of Telitacicept on Antibody Titers in Primary APS Patients

Phase 2

Recruiting

• Conditions: Antiphospholipid Syndrome (APS)
• Interventions: Drug: Telitacicept+SOC; Drug: SOC

• Registration Number: NCT06315530
• Lead Sponsor: Ruijin Hospital

Brief Summary

The purpose of this study is to evaluate the regulatory effect of Telitacicept on antibody titers in primary antiphospholipid syndrome patients carrying high-risk antiphospholipid antibody profiles.

Detailed Description

This is a single center, randomized controlled trial in Ruijin Hospital. The enrolled patients will be randomized in a 1: 1 ratio to receive either SOC+Telitacicept or SOC treatment.Telitacicept is administered subcutaneously at a dose of 160mg once a week for 48 weeks.

Study Timeline

• Study Start: 2023-12-01
• Study First Submitted: 2024-03-11
• Study First Submitted QC: 2024-03-11
• Study First Posted: 2024-03-18
• Status Verified: 2024-12
• Last Update Submitted: 2025-02-26
• Last Update Posted: 2025-03-03
• Primary Completion: 2025-12-31
• Study Completion: 2026-12-31

Recruitment & Eligibility

• Status: RECRUITING
• Sex: All
• Target Recruitment: 20

Inclusion Criteria

• Age ≥18 years;
• Diagnosis of primary APS, meet 2006 Sydney classification criteria or continuously positive for antiphospholipid antibodies within the first 12 months of inclusion (tested at least every 12 weeks), classified as high-risk antiphospholipid antibody spectrum based on the risk of antibody levels, in order to meet at least one of the following conditions: 1. Positive lupus anticoagulant (LAC) (tested according to ISTH guidelines); 2. Two or three types of aPL positivity (lupus anticoagulant, anticardiolipin antibody, and anti-β2 any two or all three types of glycoprotein I antibodies; 3. Or persistent high titer aPL;
• There are no other autoimmune diseases occurring simultaneously;
• According to EULAR recommendations for antiphospholipid syndrome, a stable APS treatment regimen should be adopted;
• Female patients who are not pregnant, breastfeeding, have no fertility potential, or have not undergone contraception.

Exclusion Criteria

• Patients with a history of malignant tumor in the past 5 years, except for basal cell carcinoma or squamous cell carcinoma of skin or cervical carcinoma in situ treated locally, and there is no evidence of metastasis within 3 years;
• Patients with a history of primary immunodeficiency;
• Serious lack of IgG (IgG level < 400 mg/dL);
• IgA deficiency (IgA level < 10 mg/dL);
• Patients with a current history of infection;
• Patients with a current history of drug or alcohol abuse or dependence, or have a history of drug or alcohol abuse or dependence within 365 days before day 0;
• HIV test is historically positive or HIV screening is positive;
• Hepatitis status;
• Patients with a history of allergic reaction caused by injection of contrast agent, human or mouse protein or monoclonal antibody;
• Patients with other abnormal laboratory values with clinical significance;
• If women with reproductive potential (WCBP) are included, please refer to the following special instructions;
• Patients with concurrent major medical or mental illnesss;
• Patients with diseases of liver, kidney, heart and other important organs,blood and Endocrine system;
• Patients who have been vaccinated with live vaccine in the last month;
• Patients who have participated in any clinical trial within 28 days before the initial screening and/or within 5 times of the half-life of the study compound (whichever is longer);
• Patients who use B-cell targeted therapy drugs within one year, such as rituximab or epratuzumab;
• Patients who use tumor necrosis factor inhibitor and interleukin receptor blocker within one year;
• Patients who use Intravenous gamma globulin (IVIG) and prednisone ≥100mg/d for more than 14 days within one year or plasma exchange;
• Patients with active infection (such as herpes zoster, HIV infection, active tuberculosis, etc.) during the screening period;
• Patients with depression or suicidal thoughts;
• Other conditions that the investigator considers would make the candidate unsuitable for the study.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Experimental: SOC+Telitacicept arm	Telitacicept+SOC	Telitacicept 160mg once a week for 48 week as an add-on treatment regimen. SOC treatment includes aspirin and/or vitamin K antagonists (VKA) and/or low molecular weight heparin.
Experimental: SOC+Telitacicept arm	SOC	Telitacicept 160mg once a week for 48 week as an add-on treatment regimen. SOC treatment includes aspirin and/or vitamin K antagonists (VKA) and/or low molecular weight heparin.
Experimental: SOC arm	SOC	SOC treatment includes aspirin and/or vitamin K antagonists (VKA) and/or low molecular weight heparin.

Primary Outcome Measures

Name	Time	Method
The proportion of patients with decreased aPL titer at week 48 of treatment	week 48

Secondary Outcome Measures

Name	Time	Method
Effects of Telitacicept on the genotype, phenotype, and functional heterogeneity of T and B cells	baseline, week 12, 24, 36, 48	Application of single-cell RNA sequencing technology (scRNAseq)
new thrombotic event	48 weeks	any new thrombotic event during Telitacicept treatment

Trial Locations

Locations (1)

Ruijin Hospital; 🇨🇳 Shanghai, Shanghai, China