The disease-activity score 28 (DAS28) score is a measure of validated instrument for the assessment of the overall severity of RA disease activity calculated using the tender joint count (TJC), swollen joint count (SJC), patient's global assessment of disease activity, and erythrocyte sedimentation rate (ESR) for a total possible score of 2 to 10. Higher values indicate higher disease activity. A negative change from baseline indicates improvement.

The analysis was conducted with all the participants who complied with the inclusion and exclusion criteria, thus defining full analysis set (n=9). However, data is presented only for those participants who completed Month 24 visit (n=8).

A tender joint count (TJC) is the most specific clinical method to quantify abnormalities in participants with RA. It is associated with the level of pain. Twenty-eight joints were assessed for tenderness. Joints were classified as tender (1)/not tender (0) giving a total possible TJC score of 0 to 28. A negative change from baseline indicates improvement.

The analysis was conducted with all the participants who complied with the inclusion and exclusion criteria, thus defining full analysis set (n=9). However, data is presented only for those participants who completed Month 24 visit (n=8).

A swollen joint count (SJC) is the most specific clinical method to quantify abnormalities in participants with RA. It reflects the amount of inflamed synovial tissue. Twenty-eight joints were assessed for swelling. Joints were classified as swollen (1)/ not swollen (0) giving a total possible SJC score of 0 to 28. A negative change from baseline indicates improvement.

The analysis was conducted with all the participants who complied with the inclusion and exclusion criteria, thus defining full analysis set (n=9). However, data is presented only for those participants who completed Month 24 visit (n=8).

The ESR is an acute phase reactant and a measure of inflammation. A negative change from baseline indicates improvement.

The analysis was conducted with all the participants who complied with the inclusion and exclusion criteria, thus defining full analysis set (n=9). However, data is presented only for those participants who completed Month 24 visit (n=8).

The C-reactive protein is an inflammation marker. High levels of this protein indicate inflammation in diseases such as RA. A negative change from baseline indicates improvement.

The analysis was conducted with all the participants who complied with the inclusion and exclusion criteria, thus defining full analysis set (n=9). However, data is presented only for those participants who completed Month 24 visit (n=8).

The Physician's Global Assessment of disease activity was assessed using a Visual Analogue Scale (VAS). The left-hand extreme of the line equals 0 mm, and is described as "no disease activity" (symptom-free and no arthritis symptoms) and the right-hand extreme equals 100 mm, as "maximum disease activity" (maximum arthritis disease activity).Change from Baseline = score at observation minus score at Baseline. An increase in score from Baseline represents disease progression and/or joint worsening, no change represents halting of disease progression, and a decrease represents improvement.

The analysis was conducted with all the participants who complied with the inclusion and exclusion criteria, thus defining full analysis set (n=9). However, data is presented only for those participants who completed Month 24 visit (n=8).

The Patient's Global Assessment of disease activity was assessed using VAS. The left-hand extreme of the line equals 0 mm, and is described as "no disease activity" (symptom-free and no arthritis symptoms) and the right-hand extreme equals 100 mm, as "maximum disease activity" (maximum arthritis disease activity).Change from Baseline = score at observation minus score at Baseline. An increase in score from Baseline represents disease progression and/or joint worsening, no change represents halting of disease progression, and a decrease represents improvement.

The analysis was conducted with all the participants who complied with the inclusion and exclusion criteria, thus defining full analysis set (n=9). However, data is presented only for those participants who completed Month 24 visit (n=8).

The patient's assessment of pain was performed using a 100 mm VAS ranging from no pain (0) to unbearable pain (100). The distance in mm from the left edge of the scale was measured. A negative change from Baseline score indicates improvement in pain intensity.

The analysis was conducted with all the participants who complied with the inclusion and exclusion criteria, thus defining full analysis set (n=9). However, data is presented only for those participants who completed Month 24 visit (n=8).

The functional capacity was analyzed using Health Assessment Questionnaire-Disability Index (HAQ-DI). It is a 20-question instrument that assesses the degree of difficulty a person has in accomplishing tasks in 8 domains (dressing, arising, eating, walking, hygiene, reaching, gripping and activities of daily living). Responses in each domain are scored from 0 to 3 (0=no difficulty; 1=some difficulty; 2=much difficulty; 3=unable to do). Overall score was computed as sum of domain scores and divided by the number of domains. A total possible score ranged from 0 (best) to 3 (worst).

The analysis was conducted with all the participants who complied with the inclusion and exclusion criteria, thus defining full analysis set (n=9). However, the results are presented only for the participants with available data and who completed Month 24 visit (n=7).

Adverse event, primary and secondary insufficient responses and monoclonal gammopathy were the reasons for starting rituximab therapy.

The analysis was conducted with all 9 participants who complied with the inclusion and exclusion criteria, thus defining the full analysis set.

There are two patterns of re-treatment, namely treat-to-target and according to the clinic.

Treat-to-target: a new cycle every 6 months if not in remission, with the participant receiving no new course of treatment as long as he is in remission.

On demand (according to clinic): a new cycle when, in an assessment performed at least 16 weeks after the last treatment cycle, the participant shows moderate or high disease activity [DAS28 > 3.2 or difference in DAS28 (ΔDAS28) > 0.6]

The analysis was conducted with all 9 participants who complied with the inclusion and exclusion criteria, thus defining the full analysis set.

An infusion reaction or injection site reaction is an event that occurs after infusion or injection which may include hypersensitivity reactions or anaphylactic reactions.

Safety population was used for the analysis which included all participants who received at least one dose of study drug, whether prematurely withdrawn from the study or not and who complied with the criteria for inclusion.

Follow-up of the infectious events was done after Month 6 visit, Month 12 visit and Month 24 visit.

Safety population was used for the analysis which included all participants who received at least one dose of study drug, whether prematurely withdrawn from the study or not and who complied with the criteria for inclusion.

An Adverse Events (AE) is any untoward medical occurrence in a participant or clinical investigation subject administered a pharmaceutical product and which does not necessarily have to have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product. A Serious Adverse Events (SAE) is any untoward medical occurrence that at any dose results in death, are life threatening, requires hospitalization or prolongation of hospitalization or results in disability/incapacity, and congenital anomaly/birth defect

Safety population was used for the analysis which included all participants who received at least one dose of study drug, whether prematurely withdrawn from the study or not and who complied with the criteria for inclusion.