A Study of Ocrelizumab in Combination With Methotrexate in Patients With Rheumatoid Arthritis Who Are Naive to Methotrexate (FILM)

The mTSS is a measure of joint damage and includes measures of joint erosion (JE) and joint space narrowing (JSN). The JE score, using the van der Heijde modification, measures erosion severity in 32 hand joints and 12 foot joints. Each hand joint is scored from 0 to 5 and each foot joint is scored from 0 to 10; the total score ranges from 0 to 280. Each joint is scored according to the surface area involved. A score of 10 indicates extensive loss of bone from more than one-half of the articulating bone; a score of 0 indicates no erosion. The JSN score measures the severity of JSN in 30 hand joints (15 per hand) and 12 foot joints (6 per foot). Each joint is scored from 0 to 4; the total score ranges from 0 to 168. A higher score indicates more joint space narrowing. The mTSS ranges from 0 to 448 (280+168). A higher mTSS score indicates greater damage. A negative change score indicates improvement.

Time frame: Baseline to Week 52

A participant was in DAS28 remission if their DAS28 score \< 2.6). The DAS28 is a combined index for measuring disease activity in rheumatic arthritis (RA) and includes swollen and tender joint counts, erythrocyte sedimentation rate (ESR), and general health (GH) status. The index is calculated with the following formula: DAS28 = (0.56 × √(TJC28)) + (0.28 × √(SJC28)) + (0.7 × log(ESR)) + (0.014 × GH), where TJC28 = tender joint count and SJC28 = swollen joint count, each on 28 joints. GH = a patient's global assessment of disease activity in the previous 24 hours on a 100 mm visual analog scale (left end = no disease activity \[symptom-free and no arthritis symptoms\], right end = maximum disease activity \[maximum arthritis disease activity\]). When ESR equaled 0 mm/hr, it was set to 1 mm/hr. The DAS28 scale ranges from 0 to 10, where a higher score indicates more disease activity.

Time frame: Week 24 and Week 52

Improvement must be seen in tender (68) and swollen (66) joint counts. Joints were assessed and classified as swollen/not swollen and tender/not tender by pressure and joint manipulation. Improvement must also be seen in at least 3 of the following 5 parameters: Separate patient and physician assessments of patient disease activity in the previous 24 hours on a visual analog scale (VAS, the extreme left end of the line none \[symptom-free and no arthritis symptoms\] and the extreme right end maximum \[maximum arthritis disease activity\]; patient assessment of pain in the previous 24 hours on a VAS (extreme left end of the line none and the extreme right end unbearable); Health Assessment Questionnaire-Disability Index (20 questions, 8 components: dressing/grooming, arising, eating, walking, hygiene, reach, grip, and activities, 0=without difficulty to 3=unable to do); and C-reactive protein (CRP), or erythrocyte sedimentation rate if CRP was missing.

Time frame: Baseline to Week 52

RP was defined as a change from Baseline in the modified Total Sharp Score (mTSS) ≤ 0. The mTSS is a measure of joint damage and includes measures of joint erosion (JE) and joint space narrowing (JSN). The JE score, using the van der Heijde modification, measures erosion severity in 32 hand joints and 12 foot joints. Each hand joint is scored from 0 to 5 and each foot joint is scored from 0 to 10; the total score ranges from 0 to 280. Each joint is scored according to the surface area involved. A score of 10 indicates extensive loss of bone from more than one-half of the articulating bone; a score of 0 indicates no erosion. The JSN score measures the severity of JSN in 30 hand joints (15 per hand) and 12 foot joints (6 per foot). Each joint is scored from 0 to 4; the total score ranges from 0 to 168. A higher score indicates more joint space narrowing. The mTSS ranges from 0 to 448 (280+168). A higher mTSS score indicates greater damage. A negative change score indicates improvement.

Time frame: Week 52