An Open-label Study of GB261 in Refractory Seropositive Systemic Lupus Erythematosus

Официальное название

An Open-label Study Evaluating the Safety, Tolerability, Pharmacokinetics, Pharmacodynamics, Immunogenicity, and Preliminary Clinical Activity of GB261 in Patients With Refractory Seropositive Systemic Lupus Erythematosus

Обзор

The purpose of the study is to evaluate the safety and efficacy of CD20xCD3 T-cell engager (GB261) in patients with refractory seropositive systemic lupus erythematosus.

Подробное описание

B cells play an important role in the pathogenesis of systemic lupus erythematosus (SLE). CD20 is a transmembrane receptor that is highly expressed on approximately 95% of B lineage cells. The use of anti-CD20 for B cell depletion represents a significant breakthrough in the treatment of B-cell-mediated autoimmune diseases. GB261 is a novel CD20/CD3 bispecific TCE that is designed to have very low affinity for CD3 and high affinity for CD20 to enable efficient T cell-mediated killing while minimizing risk of cytokine release syndrome (CRS). GB261 has shown promising safety and anti-tumor activity in a Phase 1/2 study in patients with relapsed/refractory B-cell non-Hodgkin lymphoma and chronic lymphocytic leukemia. GB261 offers a promising mechanism of action for SLE. This study aims to assess the safety, tolerability, PK, pharmacodynamics (PD), immunogenicity, and preliminary clinical activity of GB261 administered in patients with SLE. Patients will be invited to participate in the study, to receive GB261 intravenous infusion and monitored from the first dose of GB261 until Week 52.

Вмешательства

• Биопрепарат GB261
  GB261 will be dosed according to the assigned group.

Первичные конечные точки

• Safety and tolerability [Срок оценки: Baseline to Month 12]

Вторичные конечные точки (4)

• Pharmacokinetics of GB261 [Срок оценки: Baseline to Month 12 (Day1-4, 8-11, 15-18, 22, 29, 36 Week 8, 52)]
• Pharmacokinetics of GB261 [Срок оценки: Baseline to Month 12 (Day1-4, 8-11, 15-18, 22, 29, 36 Week 8, 52)]
• Pharmacokinetics of GB261 [Срок оценки: Baseline to Month 12 (Day1-4, 8-11, 15-18, 22, 29, 36 Week 8, 52)]
• Pharmacokinetics of GB261 [Срок оценки: Baseline to Month 12 (Day1-4, 8-11, 15-18, 22, 29, 36 Week 8, 52)]

Критерии участия

Критерии включения

• 18 to 75 years old at the time of signing the informed consent form (ICF)
• Diagnosis of SLE according to the 2019 American College of Rheumatology (ACR), European Alliance of Associations for Rheumatology (EULAR) classification criteria
• 3\. Positive for 2 out of 3 antibodies at Screening: a. Anti-dsDNA; b. Anti-Smith antibodies; c. Antinuclear antibody (ANA) titer ≥1:80
• Active SLE disease
• Inadequate response
• Current and stable use of some medication up to Day 1
• Current and stable use of some medication must be discontinued ≥1 week prior to Day 1

Additional Inclusion Criteria for SLE with Active LN

SLE patients with active LN are eligible to be included in the study only if all of the following additional criteria apply:

• Active, biopsy-proven, proliferative LN Class III or IV according to the 2018 International Society of Nephrology/Renal Pathology Society criteria
• Inadequate response
• Stable angiotensin-converting enzyme inhibitors/angiotensin receptor blockers for at least 4 weeks prior to Screening

Критерии исключения

• Inadequate clinical laboratory parameters at Screening:
• Patients will be excluded if they are known to have active infection
• Receipt of or inability to discontinue any excluded therapies
• Receipt of live vaccine within 4 weeks prior to Screening
• Presence of any concomitant autoimmune disease
• Active or known history of catastrophic anti-phospholipid syndrome (APS)
• APS or thrombotic event not adequately controlled by anticoagulation therapy
• History of progressive multifocal leukoencephalopathy
• History of primary immunodeficiency or a hereditary deficiency of the complement system
• Central nervous system (CNS) disease
• Presence of 1 or more significant concurrent medical conditions per investigator judgment
• Have a diagnosis or history of malignant disease within 5 years prior to Screening
• Serious mental illness, alcohol or drug abuse, dementia, or any other condition that would impair the patient's ability to receive the planned treatment or to understand informed consent at the study site as determined by local practice
• Inability to comply with protocol-mandated requirements
• History of severe allergic or anaphylactic reactions to mAb therapy (or recombinant antibody-related fusion proteins) or any constituents of study drug.
• History of or planned organ transplant and/or autologous or allogeneic hematopoietic stem cell transplantation for the duration of the study.
• Major surgery requiring use of general anesthesia within 12 weeks prior to Screening or planned or expected major surgery during the study period (from Screening to patient's last visit).
• Any serious medical condition or abnormality on clinical laboratory testing
• Women who are pregnant or breastfeeding.
• Sexually active male patients who do not agree to refrain from donating semen

Критерии приведены из реестра в оригинале (на английском). Окончательную оценку соответствия проводит исследовательский центр.

Здоровые добровольцы: Нет

Дизайн исследования

Распределение

Не применимо

Модель

Одна группа

Маскирование

Открытое

Основная цель

Лечение

Центры проведения

Китай · 1 центр

• Wuhan Union Hospital — Ухань

Идентификаторы

NCT: NCT06945068 · UHCT250170

Первоисточники (государственные реестры)

• ClinicalTrials.gov (NIH, США)

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