A Multicenter, Randomized, Double-Blind, Placebo-Controlled Phase IIa Clinical Study to Evaluate the Efficacy and Safety of TollB-001 Tablets in Patients With Moderate to Severe Active Rheumatoid Arthritis
The goal of this study is to evaluate the safety, pharmacokinetic (PK) characteristics, and preliminary efficacy of a new oral chemical drug in : adults aged 18-70 years (male or female) with moderate to severe active rheumatoid arthritis (RA), who have had inadequate response to or intolerance of at least one conventional synthetic disease-modifying antirheumatic drug (csDMARDs) . Participants will take the assigned study drug (either tollB-001 Tablets or placebo) once daily orally for 4 weeks, follow up for 1 week.
• Aged 18 to 70 years (inclusive) at the time of signing the informed consent form, regardless of gender.
• Diagnosis of RA according to the 1987 American College of Rheumatology (ACR) criteria or the 2010 ACR/European League Against Rheumatism (EULAR) classification criteria.
• DAS28-CRP \> 3.2 at screening (joints that have undergone major surgical treatment or intra-articular injection of glucocorticoids or hyaluronic acid within 6 weeks before randomization are not counted in the TJC and SJC counts).
• C-reactive protein (CRP)/high-sensitivity C-reactive protein (hsCRP) ≥ upper limit of normal (ULN) at screening.
• Prior to the first administration of the study drug, has received continuous treatment with at least one conventional synthetic disease-modifying antirheumatic drug (csDMARDs, including methotrexate, chloroquine, hydroxychloroquine, sulfasalazine, leflunomide, iguratimod) with inadequate response or intolerance, and agrees to discontinue use during the study.
• Female and male subjects of childbearing potential must use effective contraceptive measures during the study and for 3 months after the last study drug administration. Male subjects whose spouses or partners are females of childbearing potential must also agree to use effective contraceptive measures during the study and for 3 months after the last administration, and shall not donate sperm during this period. Female subjects of childbearing potential must have a negative pregnancy test.
• Must provide written informed consent and be willing and able to comply with the study protocol (e.g., understand and complete questionnaires, follow the visit schedule, take medications as prescribed).