Simple Disease Activity Index (SDAI) is calculated using the following formula: TJC + SJC + PGA + MDGA + CRP (TJC = number of painful joints from 28 joints, SJC = number of swollen joints from 28 joints, PGA = patient global assessment on a visual analog scale 0-10 cm, MDGA = physician global assessment on a visual analog scale 0-10 cm, and CRP = c-reactive protein in mg/dL) SDAI Remission is defined as SDAI <= 3.3.

Using a logistic regression model that includes treatment arm, randomization stratification factor, and baseline SDAI as continuous variable and point estimate of adjusted ORs, corresponding 95% CI and p-value was provided. SDAI total score range: 0 to 86. SDAI <= 3.3 indicates disease remission and SDAI >26 = high disease activity.

Primary analysis population included the first 50 Japanese and 325 rest of world (ROW) randomized and treated subjects in cohort 1 in the Induction Period. Intention to treat analysis. Non-Responder imputation.

DAS28-CRP = Disease Activity Score 28 based on C-reactive protein DAS28-CRP Remission is defined as DAS28-CRP <= 2.6 Using a logistic regression model that includes treatment arm, stratification variable and baseline measure as continuous variable and point estimate of adjusted ORs, corresponding 95% CI and p-value was provided.

Primary analysis population included the first 50 Japanese and 325 rest of world (ROW) randomized and treated subjects in cohort 1 in the Induction Period. Intention to treat analysis. Non-Responder imputation.

Simple Disease Activity Index (SDAI) is calculated using the following formula: TJC + SJC + PGA + MDGA + CRP (TJC = number of painful joints from 28 joints, SJC = number of swollen joints from 28 joints, PGA = patient global assessment on a visual analog scale 0-10 cm, MDGA = physician global assessment on a visual analog scale 0-10 cm, and CRP = c-reactive protein in mg/dL) SDAI Remission is defined as SDAI <= 3.3. Using a logistic regression model that includes treatment arm, randomization stratification factor, and baseline SDAI as continuous variable and point estimate of adjusted ORs, corresponding 95% CI and p-value was provided. SDAI total score range: 0 to 86. SDAI <= 3.3 indicates disease remission and SDAI >26 = high disease activity.

Primary analysis population included the first 50 Japanese and 325 rest of world (ROW) randomized and treated subjects in cohort 1 in the Induction Period. Intention to treat analysis. Non-Responder imputation.

The Modified Total Sharp Score (mTSS) is calculated as the bilateral sum of erosion and Joint Space Narrowing (JSN) scores across all joints of the hands and feet.The score range for mTSS is 0-448. Higher scores indicate more joint damage. The mean change from baseline in TSS using modified Sharp/van der Heijide scores was assessed using a rank-based nonparametric ANCOVA model.

Cohort 1 analysis population included all randomized and treated subjects in the Induction Period. Intention to treat analysis. Linear extrapolation imputation.

Boolean Remission is defined as Tender joint count less than 1, Swollen joint count less than 1, CRP less than 1 mg/dL, patient global assessment less than 1 (on 0 to 10 VAS scale). Logistic regression was used for this endpoint.

Cohort 1 analysis population included all randomized and treated subjects in the Induction Period. Intention to treat analysis. Non-Responder imputation.