Clinical Trial to Evaluate Efficacy and Safety of Multiple Subcutaneous Injections of Various Doses of BCD-085 in Patients With Active Ankylosing Spondylitis

Inclusion criteria

• Written informed consent
• Age between 18 and 65 years
• Active ankylosing spondylitis according to modified criteria of New York classification (1984), that was diagnosed at least 3 months prior to screening.
• Active disease according to BASDAI (score 4 or more) if nonsteroidal antiinflammatory drugs were used in the last 3 month prior to screening.
• Mean backache intensity equals 4 points or more.
• If patient have had biologic therapy to treat ankylosing spondylitis for at least 3 months, there was no positive results of such treatment or patient revealed intolerance to the drug. This therapy must be discontinued at least 12 weeks before enrollment in the study.
• Female patients have negative urine pregnancy test.
• Patient has no history of tuberculosis.
• Patients have negative results of Diaskintest.
• Patient has no history of alcohol or drug abuse.

Exclusion criteria

• Total spinal ankylosis.
• Allergy or intolerance of monoclonal antibodies or any excipients of study drugs.
• Previous receipt of anti-interleukin 17 drugs or anti-interleukin 17 receptor drugs.
• Prior use of two or more biologics to tumor necrosis factor alfa.
• Prior use of two or more biologics to other targets. Previous receipt of monoclonal antibodies if they were cancelled less that in 12 weeks before signing informed consent.
• Patient is taking corticosteroids for up to 4 weeks in a dose more than 10 mg (recalculated to prednisolone) before signing informed consent and during screening, or in a dose less than 10 mg (recalculated to prednisolone) if it was not stable.
• Prior use of disease-modifying antirheumatic drugs including methotrexate, sulfasalazin, chloroquine or hydroxychloroquine for up to 4 weeks before randomization, if their dose was not stable for up to 4 weeks before signing informed consent and during screening.
• Prior use of live or attenuated vaccines for up to 8 weeks before signing informed consent.
• Prior use of alkylating agents for up to 12 months prior to signing informed consent.
• Intraarticular use of corticosteroids for up to 4 weeks before randomization.