Effects of Tofacitinib (CP-690,550) on Magnetic Resonance Imaging (MRI)- Assessed Joint Structure In Early Rheumatoid Arthritis (RA)

Synovitis is defined as an area in the synovial compartment that shows above normal postgadolinium enhancement of a thickness greater than the width of the normal synovium. T1-weighted images were acquired before and after the administration of intravenous contrast agent containing gadolinium. Intravenous contrast was required to demonstrate enhancing synovitis. Synovitis was scored 0 to 3 in 3 wrist regions and in each of the first through fifth MCP joints. A score of 0 is normal, with no enhancement or enhancement up to the thickness of normal synovium, while scores of 1 to 3 (mild, moderate, severe) refer to increments of one-third of the presumed maximum volume of enhancing tissue in the synovial compartment. Total synovitis score ranges from a minimum of 0 to a maximum of 24. A negative value in synovitis change from Baseline score indicates an improvement.

Bone edema was assessed at 25 anatomic locations: 15 in 1 wrist and 10 in attached hand. Bone edema was defined as a lesion within the trabecular bone, with ill-defined margins and signal characteristics consistent with increased water content. Each bone was scored separately; the scale was 0-3 based on the proportion of bone with edema, as follows 0: no edema; 1: 1-33% of bone edematous; 2: 34-66% of bone edematous; 3: 67-100%. OMERACT RAMRIS total bone edema score for hands/wrists was sum of the individual scores for each location. Thus the maximum score per hand/wrist was 75 (range 0-75). Increasing score=greater severity.

Synovitis is defined as an area in the synovial compartment that shows above normal postgadolinium enhancement of a thickness greater than the width of the normal synovium. T1-weighted images were acquired before and after the administration of intravenous contrast agent containing gadolinium. Intravenous contrast was required to demonstrate enhancing synovitis. Synovitis was scored 0 to 3 in 3 wrist regions and in each of the first through fifth MCP joints. A score of 0 is normal, with no enhancement or enhancement up to the thickness of normal synovium, while scores of 1 to 3 (mild, moderate, severe) refer to increments of one-third of the presumed maximum volume of enhancing tissue in the synovial compartment. Total synovitis score ranges from a minimum of 0 to a maximum of 24. A negative value in synovitis change from Baseline score indicates an improvement.

Bone edema was assessed at 25 anatomic locations: 15 in 1 wrist and 10 in attached hand. Bone edema was defined as a lesion within the trabecular bone, with ill-defined margins and signal characteristics consistent with increased water content. Each bone was scored separately; the scale was 0â€"3 based on the proportion of bone with edema, as follows 0: no edema; 1: 1â€"33% of bone edematous; 2: 34â€"66% of bone edematous; 3: 67â€"100%. OMERACT RAMRIS total bone edema score for hands/wrists was sum of the individual scores for each location. Thus the maximum score per hand/wrist was 75 (range 0-75). Increasing score=greater severity.

Bone erosion assessed at 25 anatomic locations: 15 in 1 wrist and 10 in attached hand. Each site was scored in 1.0 increments from 0 (no damage) to 10 (severe damage), indicating erosion (each unit=10% bone loss) of original articular bone. OMERACT RAMRIS total erosion score for hands/wrists was sum of the individual scores for each location. Thus the maximum score per hand/wrist is 250 (range 0-250). Increasing score=greater severity.

Modified TSS is a measure of change in joint health. TSS is defined as joint space narrowing score (range 0 [no narrowing] to 168 [high narrowing]) plus (+) erosion score (range is from 0 [no erosion] to 280 [high erosion]). The modified TSS range is from 0 (no damage) to 448 (bad joint status). Increase from baseline represents disease progression and / or joint worsening; no change represents halting of disease progression; a decrease represents improvement.

Modified TSS is a measure of change in joint health. TSS is defined as joint space narrowing score (range 0 [no narrowing] to 168 [high narrowing]) + erosion score (range is from 0 [no erosion] to 280 [high erosion]). The modified TSS range is from 0 (no damage) to 448 (bad joint status). Increase from baseline represents disease progression and / or joint worsening; no change represents halting of disease progression; a decrease represents improvement.

JSN score (a component of the modified TSS) is a measure of change in joint health. JSN score range is 0 (no narrowing) to 168 (high narrowing). Increase from baseline represents disease progression and / or joint worsening; no change represents halting of disease progression; a decrease represents improvement.

JSN score (a component of the modified TSS) is a measure of change in joint health. JSN score range is 0 (no narrowing) to 168 (high narrowing). Increase from baseline represents disease progression and / or joint worsening; no change represents halting of disease progression; a decrease represents improvement.

Erosion score (a component of the modified TSS) is a measure of change in joint health. Erosion score range is from 0 (no erosion) to 280 (high erosion). Increase from baseline represents disease progression and / or joint worsening; no change represents halting of disease progression; a decrease represents improvement.

Erosion score (a component of the modified TSS) is a measure of change in joint health. Erosion score range is from 0 (no erosion) to 280 (high erosion). Increase from baseline represents disease progression and / or joint worsening; no change represents halting of disease progression; a decrease represents improvement.

ACR20 response: greater than or equal to (≥)20% improvement in tender joint count; ≥20% improvement in swollen joint count; and ≥20% improvement in at least 3 of 5 remaining ACR core measures: Participant's Assessment of Pain; Participant's Global Assessment of Disease Activity; Physician Global Assessment of Disease Activity; self-assessed disability (disability index of the Health Assessment Questionnaire [HAQ]); and C-Reactive Protein (CRP).

ACR50 response: ≥ 50% improvement in tender or swollen joint counts and 50% improvement in 3 of the following 5 criteria: 1) Physician's Global Assessment of Disease Activity, 2) Participant's Assessment of disease activity, 3) Paricipant's Assessment of Pain, 4) Participant's assessment of functional disability via a HAQ, and 5) CRP at each visit.

ACR70 response: ≥70% improvement in tender or swollen joint counts and 70% improvement in 3 of the following 5 criteria: 1) Physician's Global Assessment of Disease Activity, 2) Participant's Assessment of Disease Activity, 3) Participant's Assessment of Pain, 4) Participant's Assessment of Functional Disability via a HAQ, and 5) CRP at each visit.

DAS28-3 (CRP) was calculated from the swollen joint count and tender joint count using the 28 joints count and CRP (mg/L). Total score range: 0 to 9.4, higher score indicated more disease activity. DAS28-3 (CRP) less than or equal to (≤)3.2 implied low disease activity and greater than (>)3.2 to 5.1 implied moderate to high disease activity, and DAS28-3 (CRP) less than (<)2.6 = remission.

DAS28-3 (CRP) was calculated from the swollen joint count and tender joint count using the 28 joints count and CRP (mg/L). Total score range: 0 to 9.4, higher score indicated more disease activity.

DAS28-4 (ESR) was calculated from swollen joint count and tender joint count using 28 joints count, ESR (millimeters per hour [mm/hour]) and Participant Global Assessment of disease activity (participant rated arthritis activity assessment). Total score range: 0 to 9.4; higher score=more disease activity. DAS28-4 (ESR) ≤3.2 implied low disease activity and >3.2 to 5.1 implied moderate to high disease activity, and DAS28-4 (ESR) <2.6 = remission.

DAS28-4 (ESR) was calculated from swollen joint count and tender joint count using 28 joints count, ESR (millimeters per hour [mm/hour]) and Participant Global Assessment of disease activity (participant rated arthritis activity assessment). Total score range: 0 to 9.4; higher score=more disease activity.

DAS28-3(CRP) was calculated from the swollen joint count and tender joint count using 28-joints count and CRP (mg/L). Total score range: 0 to 9.4, higher score indicated more disease activity. DAS28 categorical responses define a good (absolute: <3.2 or >1.2 improvement from baseline [BL]), moderate (absolute: 3.2-5.1 or 0.6-1.2 change from BL), or no response (absolute: >5.1 or <0.6 change from BL).

DAS28-3(CRP) was calculated from the swollen joint count and tender joint count using 28-joints count and CRP (mg/L). Total score range: 0 to 9.4, higher score indicated more disease activity. DAS28-3(CRP) ≤3.2 implied low disease activity.

DAS28-3(CRP) was calculated from the swollen joint count and tender joint count using 28-joints count and CRP (mg/L). Total score range: 0 to 9.4, higher score indicated more disease activity. DAS28-3(CRP) <2.6 implied remission.

DAS28-4(ESR) was calculated from swollen joint count and tender joint count using 28 joints count, ESR (mm/hour) and Participant's Global Assessment of Disease Activity (participant rated arthritis activity assessment). Total score range: 0 to 9.4, higher score=more disease activity. DAS28 categorical responses define a good (absolute: <3.2 or >1.2 improvement from BL), moderate (absolute: 3.2-5.1 or 0.6-1.2 change from BL), or no response (absolute: >5.1 or <0.6 change from BL).

DAS28-4(ESR) was calculated from swollen joint count and tender joint count using 28 joints count, ESR (mm/hour) and Participant's Global Assessment of Disease Activity (participant rated arthritis activity assessment). Total score range: 0 to 9.4, higher score=more disease activity. DAS28-4(ESR) ≤3.2 implied low disease activity.

DAS28-4(ESR) was calculated from swollen joint count and tender joint count using 28 joints count, ESR (mm/hour) and Participant's Global Assessment of Disease Activity (participant rated arthritis activity assessment). Total score range: 0 to 9.4, higher score=more disease activity. DAS28-4(ESR) <2.6 implied remission.