A Study to Evaluate the Safety and Efficacy of Rituximab in Combination With Methotrexate Compared to Methotrexate Alone in Patients With Active Rheumatoid Arthritis

To achieve an ACR20 required at least a 20% improvement compared with Baseline in both tender joint counts (68 joints assessed for tenderness) and swollen joint counts (66 joints assessed for swelling), as well as a 20% improvement in three of the following five additional measurements:

• Physician's global assessment of disease activity (assessed using a 100 mm Visual Analog Scale [VAS]);
• Patient's global assessment of disease activity (assessed using a 100 mm VAS);
• Patient's assessment of pain (assessed using a 100 mm VAS);
• Health Assessment Questionnaire (HAQ; a patient completed questionnaire consisting of 20 questions, scored from 0-3);
• Acute phase reactant: C-reactive protein (CRP) or, if CRP was missing, erythrocyte sedimentation rate (ESR).

Participants who withdrew prematurely from the study prior to Week 24, who received rescue therapy or had insufficient data in order to calculate a clinical response were considered to be non-responders.

To achieve an ACR50 required at least a 50% improvement compared with Baseline in both tender joint counts (68 joints assessed for tenderness) and swollen joint counts (66 joints assessed for swelling), as well as a 50% improvement in three of the following five additional measurements:

• Physician's global assessment of disease activity (assessed using a 100 mm Visual Analog Scale [VAS]);
• Patient's global assessment of disease activity (assessed using a 100 mm VAS);
• Patient's assessment of pain (assessed using a 100 mm VAS);
• Health Assessment Questionnaire (HAQ; a patient completed questionnaire consisting of 20 questions, scored from 0-3);
• Acute phase reactant: C-reactive protein (CRP) or, if CRP was missing, erythrocyte sedimentation rate (ESR).

Participants who withdrew prematurely from the study prior to Week 24, who received rescue therapy or had insufficient data in order to calculate a clinical response were considered to be non-responders.

To achieve an ACR70 required at least a 70% improvement compared with Baseline in both tender joint counts (68 joints assessed for tenderness) and swollen joint counts (66 joints assessed for swelling), as well as a 70% improvement in three of the following five additional measurements:

• Physician's global assessment of disease activity (assessed using a 100 mm Visual Analog Scale [VAS]);
• Patient's global assessment of disease activity (assessed using a 100 mm VAS);
• Patient's assessment of pain (assessed using a 100 mm VAS);
• Health Assessment Questionnaire (HAQ; a patient completed questionnaire consisting of 20 questions, scored from 0-3);
• Acute phase reactant: C-reactive protein (CRP) or, if CRP was missing, erythrocyte sedimentation rate (ESR).

Participants who withdrew prematurely from the study prior to Week 24, who received rescue therapy or had insufficient data in order to calculate a clinical response were considered to be non-responders.

The DAS28 is a composite score to measure disease activity in patients with rheumatoid arthritis, derived from the following variables:

• The number of swollen and tender joints assessed using the 28-joint count;
• Erythrocyte sedimentation rate (ESR);
• Patient's global assessment of disease activity measured on a 100 mm visual analog scale.

The DAS28 score ranges from zero to ten. A DAS28 score above 5.1 means high disease activity whereas a DAS28 less than or equal to 3.2 indicates low disease activity. Remission is achieved by a DAS28 lower than 2.6.

A EULAR response reflects an improvement in disease activity and an attainment of a lower degree of disease activity based on the DAS28 score. The DAS28 score ranges from 0-10, with higher scores indicating more disease activity.

A Good Response is defined as an improvement (decrease) in the DAS28 of more than 1.2 compared with Baseline and attainment of a DAS28 score of less than or equal to 3.2.

A Moderate Response is defined as either:

• an improvement (decrease) in the DAS28 of greater than 0.6 and less than or equal to 1.2 from Baseline and attainment of a DAS28 score of less than or equal to 5.1 or,
• an improvement (decrease) in the DAS28 of more than 1.2 from Baseline and attainment of a DAS28 score of greater than 3.2.

No Response is defined as either an improvement (decrease) in the DAS28 of less than or equal to 0.6, or an improvement (decrease) in the DAS28 of greater than 0.6 and less than or equal to 1.2 and attainment of a DAS28 of more than 5.1.

Sixty-six joints were assessed and classified as swollen/not swollen by pressure and joint manipulation on physical examination.

The percentage change from baseline at each post-baseline visit was calculated as:

[(post-baseline value minus baseline value) divided by Baseline value]*100.

A negative percentage change from baseline score indicates an improvement.

Sixty-eight joints were assessed and classified as tender/not tender by pressure and joint manipulation on physical examination.

The percentage change from baseline at each post-baseline visit was calculated as:

[(post-baseline value minus baseline value) divided by Baseline value]*100.

A negative percentage change from baseline score indicates an improvement.

The participant's overall assessment of their current disease activity measured on a 100 mm horizontal visual analog scale (VAS). The left-hand extreme of the line (0 mm) was described as "no disease activity" (symptom-free and no arthritis symptoms) and the right-hand extreme (100 mm) as "maximum disease activity" (maximum arthritis disease activity).

The percentage change from baseline at each post-baseline visit was calculated as:

[(post-baseline value minus baseline value) divided by Baseline value]*100.

A negative percentage change from baseline score indicates an improvement.

The participant's assessment of their current level of pain on a 100 mm horizontal visual analog scale (VAS), where the left-hand extreme of the line (0 mm) was described as "no pain" and the right-hand extreme (100 mm) as "unbearable pain".

The percentage change from baseline at each post-baseline visit was calculated as:

[(post-baseline value minus baseline value) divided by Baseline value]*100.

A negative percentage change from baseline score indicates an improvement.

The physician's assessment of the participant's current disease activity on a 100 mm horizontal VAS, where the left-hand extreme of the line (0 mm) was described as "no disease activity" (symptom-free and no arthritis symptoms) and the right-hand extreme (100 mm) as "maximum disease activity".

The percentage change from baseline at each post-baseline visit was calculated as:

[(post-baseline value minus baseline value) divided by Baseline value]*100.

A negative percentage change from baseline score indicates an improvement.

The Stanford Health Assessment Questionnaire disability index is a patient-reported questionnaire specific for rheumatoid arthritis. It consists of 20 questions referring to eight domains: dressing/grooming, arising, eating, walking, hygiene, reach, grip, and daily activities. Participants choose from four response categories, ranging from 'without any difficulty' (Score=0) to 'unable to do' (Score=3). The overall score is the average of each of the 8 category scores and ranges from 0 to 3, where zero represents no disability and three very severe, high-dependency disability.

The percentage change from baseline at each post-baseline visit was calculated as:

[(post-baseline value minus baseline value) divided by Baseline value]*100.

A negative percentage change from baseline score indicates an improvement.

C-Reactive Protein (CRP) was measured from blood samples by a central laboratory as a marker for inflammation.

The percentage change from baseline at each post-baseline visit was calculated as:

[(post-baseline value minus baseline value) divided by Baseline value]*100.

A negative percentage change from baseline score indicates an improvement.

Erythrocyte sedimentation rate (ESR) indirectly measures how much inflammation is in the body. A higher ESR is indicative of increased inflammation.

The percentage change from baseline at each post-baseline visit was calculated as:

[(post-baseline value minus baseline value) divided by Baseline value]*100.

A negative percentage change from baseline score indicates an improvement.

The SF-36 measures the impact of disease on overall quality of life and consists of 36 questions split into two major components: physical health and mental health. Under physical health are the following four domains: physical health, bodily pain, physical functioning and physical role limitations. Under the mental health domain there are four domains; mental health, vitality, social functioning, and emotional role limitation. The individual domain scores are aggregated to derive a physical-component summary score and a mental-component summary score which range from 0 to 100, with higher scores indicating a better level of functioning.

The percentage change from baseline at each post-baseline visit was calculated as:

[(post-baseline value minus baseline value) divided by Baseline value]*100.

A positive percentage change from baseline score indicates an improvement.

The SF-36 measures the impact of disease on overall quality of life and consists of 36 questions in eight domains (physical function, pain, general and mental health, vitality, social function, physical and emotional health). The individual domain scores are calculated and transformed to range from 0 to 100, with higher scores indicating a better level of functioning.

A positive change from baseline score indicates an improvement.

The SF-36 measures the impact of disease on overall quality of life and consists of 36 questions in eight domains (physical function, pain, general and mental health, vitality, social function, physical and emotional health). The individual domain scores are calculated and transformed to range from 0 to 100, with higher scores indicating a better level of functioning.

A positive change from baseline score indicates an improvement.

The SF-36 measures the impact of disease on overall quality of life and consists of 36 questions in eight domains (physical function, pain, general and mental health, vitality, social function, physical and emotional health). The individual domain scores are calculated and transformed to range from 0 to 100, with higher scores indicating a better level of functioning.

A positive change from baseline score indicates an improvement.

The SF-36 measures the impact of disease on overall quality of life and consists of 36 questions in eight domains (physical function, pain, general and mental health, vitality, social function, physical and emotional health). The individual domain scores are calculated and transformed to range from 0 to 100, with higher scores indicating a better level of functioning.

A positive change from baseline score indicates an improvement.

The SF-36 measures the impact of disease on overall quality of life and consists of 36 questions in eight domains (physical function, pain, general and mental health, vitality, social function, physical and emotional health). The individual domain scores are calculated and transformed to range from 0 to 100, with higher scores indicating a better level of functioning.

A positive change from baseline score indicates an improvement.

The SF-36 measures the impact of disease on overall quality of life and consists of 36 questions in eight domains (physical function, pain, general and mental health, vitality, social function, physical and emotional health). The individual domain scores are calculated and transformed to range from 0 to 100, with higher scores indicating a better level of functioning.

A positive change from baseline score indicates an improvement.

The SF-36 measures the impact of disease on overall quality of life and consists of 36 questions in eight domains (physical function, pain, general and mental health, vitality, social function, physical and emotional health). The individual domain scores are calculated and transformed to range from 0 to 100, with higher scores indicating a better level of functioning.

A positive change from baseline score indicates an improvement.

The SF-36 measures the impact of disease on overall quality of life and consists of 36 questions in eight domains (physical function, pain, general and mental health, vitality, social function, physical and emotional health). The individual domain scores are calculated and transformed to range from 0 to 100, with higher scores indicating a better level of functioning.

A positive change from baseline score indicates an improvement.

The FACIT-Fatigue questionnaire is a self-administered patient questionnaire that consists of 13 questions designed to measure the degree of fatigue experienced by participants in the previous 7 days. Participants respond to the questions using a value in the range of 0 (not at all) to 4 (very much). The scale score is computed by summing the item scores, after reversing those items that are worded in the negative direction. The FACIT-Fatigue subscale score ranges from 0 to 52, where higher scores represent less fatigue.

A positive change from baseline score indicates an improvement.

The DAS28 is a composite score to measure disease activity in patients with rheumatoid arthritis, derived from the following variables:

• The number of swollen and tender joints assessed using the 28-joint count;
• Erythrocyte sedimentation rate (ESR);
• Patient's global assessment of disease activity measured on a 100 mm visual analog scale.

The DAS28 score ranges from zero to ten. DAS28 above 5.1 indicates high disease activity.

Low disease activity is defined by a DAS28 score less than or equal to 3.2. Remission is defined by a DAS28 score less than 2.6.

The Stanford Health Assessment Questionnaire disability index is a patient-reported questionnaire specific for rheumatoid arthritis. It consists of 20 questions referring to eight domains: dressing/grooming, arising, eating, walking, hygiene, reach, grip, and daily activities. Participants choose from four response categories, ranging from 'without any difficulty' (Score=0) to 'unable to do' (Score=3). The overall score is the average of each of the 8 category scores and ranges from 0 to 3, where zero represents no disability and three very severe, high-dependency disability. A negative change from baseline score indicates an improvement.

Improved HAQ-DI is defined as a change from Baseline score less than or equal to -0.22.

An Unchanged HAQ-DI is defined as a change from Baseline score greater than -0.22 and less than 0.22.

A worsened HAQ-DI score is defined as a change from Baseline score of greater than or equal to 0.22.

The Stanford Health Assessment Questionnaire disability index is a patient-reported questionnaire specific for rheumatoid arthritis. It consists of 20 questions referring to eight domains: dressing/grooming, arising, eating, walking, hygiene, reach, grip, and daily activities. Participants choose from four response categories, ranging from 'without any difficulty' (Score=0) to 'unable to do' (Score=3). The overall score is the average of each of the 8 category scores and ranges from 0 to 3, where zero represents no disability and three very severe, high-dependency disability. A negative change from baseline score indicates an improvement.

Improved HAQ-DI is defined as a change from Baseline score less than or equal to -0.22.

An Unchanged HAQ-DI is defined as a change from Baseline score greater than -0.22 and less than 0.22.

A worsened HAQ-DI score is defined as a change from Baseline score of greater than or equal to 0.22.

A EULAR response reflects an improvement in disease activity and an attainment of a lower degree of disease activity based on the DAS-28 score.

A Good Response is defined as an improvement (decrease) in the DAS28 of more than 1.2 compared with Baseline and attainment of a DAS28 score less than or equal to 3.2.

A Moderate Response is defined as either:

• an improvement (decrease) in the DAS28 of greater than 0.6 and less than or equal to 1.2 and attainment of a DAS28 score of less than or equal to 5.1 or,
• an improvement (decrease) in the DAS28 of more than 1.2 and attainment of a DAS28 score of greater than 3.2.

No Response is defined as either an improvement (decrease) in the DAS28 of less than or equal to 0.6, or an improvement (decrease) in the DAS28 of greater than 0.6 and less than or equal to 1.2 and attainment of a DAS28 score of 5.1 or higher.

The DAS28 is a composite score to measure disease activity in patients with rheumatoid arthritis, derived from the following variables:

• The number of swollen and tender joints assessed using the 28-joint count;
• Erythrocyte sedimentation rate (ESR);
• Patient's global assessment of disease activity measured on a 100 mm visual analog scale.

The DAS28 score ranges from zero to ten. DAS28 above 5.1 indicates high disease activity.

Low disease activity is defined by a DAS28 score less than or equal to 3.2. Remission is defined by a DAS28 score less than 2.6.

To achieve an ACR50 required at least a 50% improvement compared with Baseline in both tender joint counts (68 joints assessed for tenderness) and swollen joint counts (66 joints assessed for swelling), as well as a 50% improvement in three of the following five additional measurements:

• Physician's global assessment of disease activity (assessed using a 100 mm Visual Analog Scale [VAS]);
• Patient's global assessment of disease activity (assessed using a 100 mm VAS);
• Patient's assessment of pain (assessed using a 100 mm VAS);
• Health Assessment Questionnaire (HAQ; a patient completed questionnaire consisting of 20 questions, scored from 0-3);
• Acute phase reactant: C-reactive protein (CRP) or, if CRP was missing, erythrocyte sedimentation rate (ESR).

Participants who withdrew prematurely from the study prior to week 48, who received rescue therapy or had insufficient data in order to calculate a clinical response were considered to be non-responders.

To achieve an ACR70 required at least a 70% improvement compared with baseline in both tender joint counts (68 joints assessed for tenderness) and swollen joint counts (66 joints assessed for swelling), as well as a 70% improvement in three of the following five additional measurements:

• Physician's global assessment of disease activity (assessed using a 100 mm Visual Analog Scale [VAS]);
• Patient's global assessment of disease activity (assessed using a 100 mm VAS);
• Patient's assessment of pain (assessed using a 100 mm VAS);
• Health Assessment Questionnaire (HAQ; a patient completed questionnaire consisting of 20 questions, scored from 0-3);
• Acute phase reactant: C-reactive protein (CRP) or, if CRP was missing, erythrocyte sedimentation rate (ESR).

Participants who withdrew prematurely from the study prior to Week 48, who received rescue therapy or had insufficient data in order to calculate a clinical response were considered to be non-responders.