This study will evaluate the efficacy and safety of 608 in patients with AS.
Able to understand and comply with the protocol requirements, participate and sign the informed consent form (ICF) voluntarily;
At least 18 years of age at the time of signing the ICF, with no gender restrictions;
Meet the 1984 modified New York criteria for ankylosing spondylitis (AS);
Have inadequate response to non-steroidal anti-inflammatory drugs (NSAIDs) or have contraindications/intolerance to NSAIDs treatment;
Patients with other uncontrolled active inflammatory diseases.
Clinical laboratory tests and other tests that reveal abnormalities with clinical significance
Patients who have active Hepatitis B, Hepatitis C or HIV infections as determined by positive results at Screening.
History of cancer.
Parallel
608 dose
Drug608 subcutaneous (SC) injection.
Placebo
DrugPlacebo subcutaneous (SC) injection.
The Percentage of Participants Who Achieved an Assessment of Spondylo Arthritis International Society (ASAS) 40 Response.
Assessment of SpondyloArthritis International Society criteria (ASAS) consist of 6 domains (4 main and 2 additional assessment domains): 1. Patient's global assessment measured on a NRS; 2. Patient's assessment of back pain, measured on a NRS; 3. Function represented by Bath Ankylosing Spondylitis Functional Index (BASFI) average of 10 questions as measured by NRS; 4. Inflammation represented by mean duration and severity of morning stiffness, on the Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) as measured by NRS; 5. Spinal mobility represented by the Bath Ankylosing Spondylitis Metrology Index (BASMI) lateral spinal flexion assessment; 6. C-reactive protein (acute phase reactant). ASAS40 response is defined as an improvement of ≥40% and ≥2 units on a scale of 10 in at least three of the four ASAS main domains and no worsening at all in the remaining domain. A higher score on the NRS signifies higher severity.
The Percentage of Participants Who Achieved an Assessment of Spondylo Arthritis International Society (ASAS) 20 Response.
Assessment of SpondyloArthritis International Society criteria (ASAS) consist of 6 domains (4 main and 2 additional assessment domains): 1. Patient's global assessment measured on a NRS; 2. Patient's assessment of back pain, measured on a NRS; 3. Function represented by Bath Ankylosing Spondylitis Functional Index (BASFI) average of 10 questions as measured by NRS; 4. Inflammation represented by mean duration and severity of morning stiffness, on the Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) as measured by NRS; 5. Spinal mobility represented by the Bath Ankylosing Spondylitis Metrology Index (BASMI) lateral spinal flexion assessment; 6. C-reactive protein (acute phase reactant). ASAS 20 response is defined as an improvement of ≥20% and ≥1 unit on a scale of 10 in at least three of the four main domains and no worsening of ≥20% and ≥1 unit on a scale of 10 in the remaining domain. A higher score on the NRS signifies higher severity.
608 Concentration in Serum.
The concentration of 608 in Serum.
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