Evaluation of the Efficacy and Safety of Two Dosing Regimens of Olokizumab (OKZ), Compared to Placebo, in Subjects With Rheumatoid Arthritis (RA) Who Were Taking an Existing Medication Called a Tumour Necrosis Factor Alpha Inhibitor But Had Active Disease

Inclusion Criteria:

Subjects may be enrolled in the study only if they meet all of the following criteria.

   - Subjects willing and able to sign informed consent

   - Subjects must have a diagnosis of adult onset RA classified by ACR/EULAR 2010 revised
   classification criteria for RA for at least 24 weeks prior to Screening.

(If the subject was diagnosed according to ACR 1987 criteria previously, the Investigator
may classify the subject per ACR 2010 retrospectively, using available source data.)

   - Treatment with oral, SC, or intramuscular (IM) MTX for at least 12 weeks prior to
   Screening at a dose of 15 to 25 mg/week (or ≥10 mg/week if there is documented
   intolerance to higher doses)

      - The dose and means of administering MTX must have been stable for at least 6
      weeks prior to Screening.

   - Subjects must be willing to take folic acid or equivalent throughout the study.

   - Subjects must have moderately to severely active RA disease as defined by all of the
   following:

      - ≥6 tender joints (68 joint count) at Screening and baseline; and

      - ≥6 swollen joints (66 joint count) at Screening and baseline; and

      - C-reactive protein (CRP) above Upper limit of normal (ULN) at Screening based on
      the central laboratory results.

   - Subjects must have a documented inadequate response to treatment (i.e., TNFi failure)
   with ≥1 licensed TNFi following at least 12 weeks of therapy with that agent.
   Inadequate response to treatment is classified as either:

      - Primary failure: The absence of any documented clinically significant response;
      or

      - Secondary failure: Documented initial response with subsequent loss of that
      response or partial response

Exclusion Criteria:

   - Diagnosis of any other inflammatory arthritis or systemic rheumatic disease (e.g.,
   gout, psoriatic or reactive arthritis, Crohn's disease, Lyme disease, juvenile
   idiopathic arthritis, or systemic lupus erythematosus) (However, subjects may have
   secondary Sjogren's syndrome or hypothyroidism.)

   - Subjects who are Steinbrocker class IV functional capacity (incapacitated, largely or
   wholly bed-ridden or confined to a wheelchair, with little or no self-care)

   - Prior exposure to any licensed or investigational compound directly or indirectly
   targeting Interleukin (IL) 6 or IL 6R (including tofacitinib or other Janus kinases
   and spleen tyrosine kinase [SYK] inhibitors)

   - Prior treatment with cell depleting therapies including anti CD20 or investigational
   agents (e.g., CAMPATH, anti CD4, anti CD5, anti CD3, and anti CD19) with the exception
   of rituximab, which is allowed if it was discontinued at least 24 weeks prior to
   baseline (rituximab should not be discontinued to facilitate a subject's participation
   in the study, but should instead have been previously discontinued as part of a
   subject's medical management of RA).

   - Prior use of bDMARDs, within the following windows prior to baseline (bDMARDs should
   not be discontinued to facilitate a subject's participation in the study, but should
   instead have been previously discontinued as part of a subject's medical management of
   RA):

      1. 4 weeks for etanercept and anakinra

      2. 8 weeks for infliximab

      3. 10 weeks for adalimumab, certolizumab, and golimumab

      4. 12 weeks for abatacept

   - Use of parenteral and/or intra-articular glucocorticoids within 4 weeks prior to
   baseline

   - Use of oral glucocorticoids greater than 10 mg/day prednisone (or equivalent) or
   change in dosage within 2 weeks prior to baseline

   - Prior documented history of no response to hydroxychloroquine and sulfasalazine

   - Prior use of cDMARDs (other than MTX) within the following windows prior to baseline
   (cDMARDs should not be discontinued to facilitate a subject's participation in the
   study, but should instead have been previously discontinued as part of a subject's
   medical management of RA):

      1. 4 weeks for sulfasalazine, azathioprine, cyclosporine, hydroxychloroquine,
      chloroquine, gold, penicillamine, minocycline, or doxycycline

      2. 12 weeks for leflunomide unless the subject has completed the following
      elimination procedure at least 4 weeks prior to baseline: Cholestyramine at a
      dosage of 8 grams 3 times daily for at least 24 hours, or activated charcoal at a
      dosage of 50 grams 4 times daily for at least 24 hours

      3. 24 weeks for cyclophosphamide

   - Vaccination with live vaccines in the 6 weeks prior to baseline or planned vaccination
   with live vaccines during the study

   - Participation in any other investigational drug study within 30 days or 5 times the
   terminal half-life of the investigational drug, whichever is longer, prior to baseline

   - Other treatments for RA (e.g., Prosorba Device/Column) within 6 months prior to
   baseline

   - Use of intra-articular hyaluronic acid injections within 4 weeks prior to baseline

   - Use of non steroidal anti inflammatory drugs (NSAIDs) on unstable dose or switching of
   NSAIDs within 2 weeks prior to baseline

   - Previous participation in this study (randomized) or another study of OKZ

   - Subjects with concurrent acute or chronic viral Hepatitis B or C infection as detected
   by blood tests at Screening (e.g., positive for hepatitis B surface antigen [HBsAg],
   total hepatitis B core antibody [anti-HBc], or hepatitis C virus antibody [HCV Ab])

   a) subjects who are positive for hepatitis B surface antibodies (anti-HBs), but
   negative for HBsAg and anti-HBc, will be eligible.

   - Subjects with HIV infection

   - Subjects with:

      1. Suspected or confirmed current active tuberculosis (TB) disease or a history of
      active TB disease.

      2. Close contact (i.e., sharing the same household or other enclosed environment,
      such as a social gathering place, workplace, or facility, for extended periods
      during the day) with an individual with active TB within 1.5 years prior to
      Screening

   - Concurrent malignancy or a history of malignancy within the last 5 years (with the
   exception of successfully treated carcinoma of the cervix in situ and successfully
   treated basal cell carcinoma and squamous cell carcinoma not less than 1 year prior to
   Screening [and no more than 3 excised skin cancers within the last 5 years prior to
   Screening])

   - Subjects with any infection requiring oral antibiotic or antiviral therapy in the 2
   weeks prior to Screening or at baseline, injectable anti-infective therapy in the last
   4 weeks prior to baseline, or serious or recurrent infection with history of
   hospitalization in the 6 months prior to baseline

   - Subjects with evidence of disseminated herpes zoster infection, zoster encephalitis,
   meningitis, or other non-self-limited herpes zoster infections in the 6 months prior
   to baseline

   - Subjects with planned surgery during the study or surgery ≤ 4 weeks prior to Screening
   and from which the subject has not fully recovered, as judged by the Investigator

   - Subjects with diverticulitis or other symptomatic GI conditions that might predispose
   the subject to perforations, including subjects with history of such predisposing
   conditions (e.g., diverticulitis, GI perforation, or ulcerative colitis)

   - Pre-existing central nervous system demyelinating disorders (e.g., multiple sclerosis
   and optic neuritis)

   - History of chronic alcohol or drug abuse as judged by the Investigator

   - Subjects with a known hypersensitivity to any component of the OKZ drug product or
   placebo

   - Subjects with a known hypersensitivity or contraindication to any component of the
   rescue medication

   - History of severe allergic or anaphylactic reactions to human, humanized, or murine
   monoclonal antibodies

   - Female subjects who are pregnant, currently lactating, have lactated within the last
   12 weeks, or who are planning to become pregnant during the study or within 6 months
   of the last dose of study treatment

   - Female subjects of childbearing potential (unless permanent cessation of menstrual
   periods, determined retrospectively after a woman has experienced 12 months of natural
   amenorrhea as defined by the amenorrhea with underlying status [e.g., correlative age]
   or 6 months of natural amenorrhea with documented serum follicle-stimulating hormone
   levels >40 mIU/mL and estradiol <20 pg/mL) who are not willing to use a highly
   effective method of contraception during the study and for at least 6 months after the
   last administration of study treatment

OR

Male subjects with partners of childbearing potential not willing to use a highly effective
method of contraception during the study and for at least 3 months after the last
administration of study treatment.

The above information was not intended to contain all considerations relevant to a
participant's potential participation in a clinical trial.