A Clinical Study of YTS109 Cell in R/R Systemic Lupus Erythematosus

An Exploratory Clinical Study of YTS109 Cell in Subjects With Refractory Disease Systemic Lupus Erythematosus

This study evaluates the safety and efficacy of YTS109 cells in adults with refractory Lupus Nephritis (LN) and Systemic Lupus Erythematosus-Immune Thrombocytopenia (SLE-ITP). Approximately 36 patients aged 18-65 will receive a single infusion of YTS109 cells (1×10⁶-2×10⁶ cells/kg). The primary endpoint is observations of types, severity, and frequency of dose-limiting toxicities (DLTs) and adverse events (AEs). Secondary endpoints include the complete renal response (CRR) rate at week 12 in LN, and proportion of subjects achieving complete response (CR) or partial response (PR) at week 12 post-treatment in SLE-ITP. This single-arm, open-label trial will enroll patients across Beijing GoBroad Hospital in China.

Study Overview

• Status: Recruiting
• Conditions: Lupus Nephritis (LN); Immune Thrombocytopenia (ITP)
• Intervention / Treatment: Drug: YTS109 cell injection

Detailed Description

Background: Systemic lupus erythematosus (SLE) is characterized by multi-system and multi-organ involvement, recurrent flares and remissions, and the presence of numerous autoantibodies. LN and SLE-ITP are the most common and severe clinical manifestations of SLE. Recently, the therapeutic advancements have been made in the management of SLE. However, the patients with refractory SLE, particularly those complicated by LN and SLE-ITP, continue to face significant unmet clinical needs. CAR-T cell therapy has emerged as one of the innovative therapeutic modalities for autoimmune diseases, characterized by its controllable safety profile and durable therapeutic efficacy, warranting further clinical exploration and investigation in the future. YTS109 cell is a universal allogeneic STAR-T cell therapy targeting CD19, designed to efficiently eliminate B cells in patients with SLE and mitigate autoimmune responses. Design: This is a single-center, single-arm, prospective exploratory clinical trial designed to evaluate the safety profile, preliminary therapeutic efficacy, and pharmacokinetic/pharmacodynamic (PK/PD) characteristics of YTS109 cell therapy in patients with refractory SLE. Approximately 36 patients aged 18-65 will receive a single infusion of YTS109 cells (1×10⁶-2×10⁶ cells/kg). The primary endpoint is observations of types, severity, and frequency of dose-limiting toxicities (DLTs) and adverse events (AEs). This study was approved by the IRB of Beijing GoBroad Hospital (Approval Number: RP2025-013-002), All participants provided written informed consent.

• Study Type: Interventional
• Enrollment (Estimated): 36
• Phase: Phase 1

Contacts and Locations

• Study Contact: Name: Jing Pan; Phone Number: 010-63290612; Email: panj@gobroaddhealthcare.com

Study Locations

• China
  • Beijing
    • Beijing, Beijing, China, 102206
      • Recruiting
      • Beijing GoBroad Hospital
      • Contact: Jing Pan; Phone Number: 010-63290612; Email: panj@gobroaddhealthcare.com

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

Subjects must meet all of the following inclusion criteria to be eligible for enrollment in this study:

1. Age ranges from 18 to 65 years old (including threshold), regardless of gender.
2. Meet the EULAR/ACR 2019 SLE Classification Criteri:

Cohort 1: Refractory Lupus Nephritis: Defined as failure to achieve remission after treatment with corticosteroids and ≥2 immunosuppressants (e.g., CTX, tacrolimus, MMF, cyclosporine) and/or biologics, with urine protein/creatinine ratio (UPCR ≥1.0 g/g) , and renal pathology requirement scriteria: ISN/RPS 2003 Class III/IV proliferative lupus nephritis (or combined with type V features) , with ≤50% glomerulosclerosis.

Cohort 2: Refractory Immune Thrombocytopenia: Requires treatment failure with: Failed treatment with at least 1 course of MP shock (1g for 3 days) or high- dose glucocorticosteroids (1mg/kg/d equivalent dose of glucocorticosteroids) in combination with 1 or more immunosuppressive agents. At least 2 consecutive routine blood tests for platelets less than 50×10^9/L and >30×10^9/L were performed prior to enrolment. other non-SLE causes of thrombocytopenia, such as infections, myelosuppression and hypersplenism, were excluded.

3. Essential Organ Function Criteria:

1. Bone marrow: Neutrophils ≥1×10^9/L (within 2 weeks, excluding granulocyte colony-stimulating factor use).

   Hemoglobin ≥60 g/L.

2. Liver: ALT/AST ≤3×ULN (disease-related elevations permitted). TBIL

   ≤1.5×ULN (disease-related elevations permitted).

3. Renal: CrCl≥30mL/min (Cockcroft-Gault formula, excluding acute declines).
4. Coagulation: INR/PT ≤1.5×ULN.
5. Cardiovascular: Hemodynamic stability. 4. Fertile females or males with partners of childbearing age must use medically approved contraception or abstain during and ≥12 months post- treatment. Negative serum HCG test (within 7 days pre-enrollment) for fertile females; non-lactating.

5. Voluntary participation with signed informed consent and compliance.

Exclusions Criteria:

Subjects who meet any of the following exclusion criteria will not be admitted to the study:

1. Severe drug allergies or hypersensitivity.
2. Uncontrolled/untreated infections (fungal, bacterial, viral, etc.).
3. CNS disorders (exceptions: epilepsy, psychosis, organic brain syndrome, cerebrovascular accident, encephalitis, CNS vasculitis).
4. Heart failure intolerance.
5. Congenital immunoglobulin deficiency.
6. Malignancy within 5 years (exceptions: localized cancers with negligible metastasis risk).
7. End-stage renal failure.
8. Subjects positive for: HBsAg / HBcAb with HBV DNA > detection limit; HCV Ab + HCV RNA; HIV Ab; Syphilis test.
9. Deep vein thrombosis/pulmonary embolism within 6 months pre- screening.
10. Severe mental illness/cognitive impairment.
11. Participation in other clinical trials within 3 months pre-screening.
12. Use of immunosuppressants (within 5 half-lives) or biologics (within 4 weeks) pre-screening.
13. Pregnancy/breastfeeding or planned conception.
14. Other researcher-determined ineligibility.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: YTS109 cell; Subjects will receive YTS109 cell (1E6 STAR+T cell/kg or 2E6 STAR+T cell/kg) once in this study.	Drug: YTS109 cell injection; Subjects will receive YTS109 Cell Injection(1E6 STAR+T cell/kg or 2E6 STAR+T cell/kg) once in this study.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Incidence of Treatment-Emergent Adverse Events	Dose-limiting toxicity (DLT);; Types, severity, and frequency of adverse events (AEs).	28 days for DLT during the treatment assessment period, and observation AEs will be conducted up to 52 weeks post-treatment.

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Efficacy Evaluation in LN	The proportion of subjects who achieved complete renal response (CRR) at 12 weeks	The complete renal response (CRR) rate at week 12 in LN, and observation will be conducted up to 52 weeks post-treatment.
Efficacy Evaluation in SLE-ITP	The proportion of subjects achieving complete response (CR) or partial response (PR) at 12 weeks	The proportion of subjects achieving complete response (CR) or partial response (PR) at week 12 post-treatment in SLE-ITP, and observation will be conducted up to 52 weeks post-treatment.
Peak Plasma Concentration (Cmax) of YTS109	To evaluate the metabolic characteristics of YTS109	These detections will be conducted up to 52 weeks post-treatment.
Time to Peak (Tmax) of YTS109	To evaluate the metabolic characteristics of YTS109	These detections will be conducted up to 52 weeks post-treatment.
Area under the plasma concentration versus time curve (AUC) of YTS109	To evaluate the metabolic characteristics of YTS109	These detections will be conducted up to 52 weeks post-treatment.
PD parameters	Changes in B cells quantification and phenotypic in peripheral blood	These detections will be conducted up to 52 weeks post-treatment.

Collaborators and Investigators

• Sponsor: China Immunotech (Beijing) Biotechnology Co., Ltd.
• Collaborators: Beijing GoBroad Hospital

Study record dates

Study Major Dates

• Study Start (Actual): April 16, 2025
• Primary Completion (Estimated): April 25, 2026
• Study Completion (Estimated): April 25, 2027

Study Registration Dates

• First Submitted: April 16, 2025
• First Submitted That Met QC Criteria: April 17, 2025
• First Posted (Actual): April 25, 2025

Study Record Updates

• Last Update Posted (Actual): May 13, 2025
• Last Update Submitted That Met QC Criteria: May 8, 2025
• Last Verified: April 1, 2025

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Urogenital Diseases; Cytopenia; Pathologic Processes; Male Urogenital Diseases; Kidney Diseases; Urologic Diseases; Female Urogenital Diseases; Female Urogenital Diseases and Pregnancy Complications; Connective Tissue Diseases; Autoimmune Diseases; Immune System Diseases; Hemorrhage; Skin Manifestations; Hematologic Diseases; Blood Coagulation Disorders; Hemorrhagic Disorders; Blood Platelet Disorders; Thrombotic Microangiopathies; Glomerulonephritis; Purpura, Thrombocytopenic; Purpura; Lupus Erythematosus, Systemic; Nephritis; Lupus Nephritis; Thrombocytopenia; Purpura, Thrombocytopenic, Idiopathic
• Other Study ID Numbers: YTS109-005

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No