Phase II Study to Analyze Sarilumab in Non-Infectious Uveitis

At least 2-step reduction in VH per central review from baseline was evaluated on Miami 9-step scale. VH is the obscuration of fundus by vitreous cells and protein exudation. Each of the 9-step scale (from grade 0 \[low opacity\] to 8 \[more opacity\]) images (in increasing order of opacity) are equivalent to approximately 0.3 log units of degradation in visual acuity based on the Bangerter calibration. Participants with prednisone dose \<10 mg/day (or equivalent oral corticosteroid) were also evaluated.

Time frame: Week 16

Population: Modified intent-to-treat population (mITT) included all randomized participants who received at least 1 injection analyzed according to the group to which the participant was allocated by the randomization schedule. Modified multiple imputation approach was used on VH missing adjudicated scores.

BCVA score is based on the number of letters read correctly on the Early Treatment Diabetic Retinopathy Study (ETDRS) visual acuity chart assessed at a starting distance of 4 meters, and then at 1 meter. The range of ETDRS is 0 to 100 letters. The lower the number of letters read correctly on the eye chart, the worse the vision (or visual acuity). An increase in the number of letters read correctly means that vision has improved. LS mean was calculated using MMRM model with treatment groups, randomization strata of VH level (\<4, \>=4), visits and visit-by-treatment groups interaction as fixed categorical effects, as well as, fixed continuous covariate of baseline BCVA.

Time frame: Baseline to Week 16

Population: Analysis was performed on mITT population. Number of participants analyzed = participants with BCVA score assessment at baseline and post-baseline visits.

CRT was measured by spectral domain optical coherence tomography (SD-OCT), a non-invasive diagnostic system providing high-resolution imaging sections of the retina. All images were transmitted to the central reading center. SD-OCT was performed in the study eye after pupil dilation. LS mean was calculated using MMRM model with treatment groups, randomization strata of VH level (\<4, \>=4), visits and visit-by-treatment groups interaction as fixed categorical effects, as well as, fixed continuous covariate of baseline CRT.

Time frame: Baseline to Week 16

Population: Analysis was performed on mITT population. Number of participants analyzed = participants with CRT assessment at baseline and post-baseline visits.

Change from baseline in VH scale was evaluated on Miami 9-step scale. VH is the obscuration of fundus by vitreous cells and protein exudation. Each of the 9-step scale (from grade 0 \[low opacity\] to 8 \[more opacity\]) images (in increasing order of opacity) were equivalent to approximately 0.3 log units of degradation in visual acuity based on the Bangerter calibration. Least squares (LS) mean was calculated using mixed model for repeated measurements (MMRM) model with treatment groups, visits and visit-by-treatment groups interaction as fixed categorical effects as well as fixed continuous covariate of baseline adjudicated VH.

Time frame: Baseline to Week 16

Population: Analysis was performed on mITT population. Number of participants analyzed = participants with VH assessment at baseline and post-baseline visits.

Participants with AC cell score = 0 or with ≥2 step reduction from baseline at Week 16 were evaluated. Slit lamp examinations were conducted at each visit to assess AC cell count. The number of AC cells observed within a 1 mm × 1 mm slit beam was used to determine the grade according to the Standardization of Uveitis Nomenclature (SUN) criteria: grade 0 = no cells; grade +0.5 = 1 - 5 cells; grade +1 = 6 - 25 cells; grade +2= 26 - 50 cells; grade +3 = too many to count.

Time frame: Week 16

Population: Analysis was performed on mITT population. Number of participants analyzed = participants with non-missing AC cell score at Week 16.

Time frame: Week 16

Population: This endpoint was replaced by the percent change from baseline in CRT at Week 16 as this is more clinically relevant. Zero participant was analyzed.

Time frame: Week 16

Population: Analysis of this endpoint was not performed as no retinal vessel leakage data was collected at Week 16. Zero participants were analyzed.

Participants with prednisone dose ≤5 mg/day (or equivalent oral corticosteroid) at Week 16 were evaluated.

Time frame: Week 16

Population: Analysis was performed on mITT population. Number of participants analyzed = participants with non-missing data for prednisone (or equivalent oral corticosteroid) dose at Week 16.

CRT was measured by SD-OCT, a non-invasive diagnostic system providing high-resolution imaging sections of the retina. All images were transmitted to the central reading center. SD-OCT was performed in the study eye after pupil dilation. LS mean was calculated using MMRM model with treatment groups, randomization strata of VH level (\<4, \>=4), visits and visit-by-treatment groups interaction as fixed categorical effects, as well as, fixed continuous covariate of baseline CRT.

Time frame: Baseline to Week 16

Population: Analysis was performed on mITT population. Number of participants analyzed = participants with CRT assessment at baseline and post-baseline visits.

Serum functional (unbound) sarilumab concentrations were determined using an enzyme-linked immunosorbent assay (ELISA) method with a lower limit of quantification (LLOQ) of 294 ng/mL. Concentrations below LLOQ were set to zero for samples at predose. Post-treatment concentrations below LLOQ were replaced by LLOQ/2. The samples were considered non-eligible for the analysis if the previous dosing time was \<11 days or \>17 days before the sampling time for every other week regimens.

Time frame: Predose on Day 1 (Baseline), Week 2, 4, 8, 12, 16, 24, 36, 52, and end of study (EOS) (Week 56)

Population: PK population: all participants who received at least one dose or part of a dose of investigational medicinal product (IMP) with at least one post-dose, non-missing serum concentration value and were analyzed according to treatment actually received. Data of this endpoint was planned to be analyzed for Sarilumab 200 mg q2w arm in Part A and B only.