The objective of this study was to evaluate the long-term safety and efficacy of repeated rituximab (RTX) infusions in the treatment of rheumatoid arthritis in daily clinical practice in Finland.
Data were collected from the medical records of a total of 151 patients with rheumatoid arthritis treated with RTX and followed up for at least 12 months after the treatment onset. Change in the 28-joint Disease Activity Score (DAS28), European League Against Rheumatism response criteria and proportions of patients reaching disease remission (DAS28 < 2.6) or low disease activity (DAS28 < 3.2) were used to assess the clinical response.
Of the 151 patients 128 received 2 courses, 76 received 3 courses, and 42 received 4 courses of RTX. The mean time to retreatment for the first 4 courses varied between 11 and 13 months. Median DAS28 decreased from 5.4 (0.5-8.6) to 3.3 (0.6-6.6) after the first course. After the second treatment course, the DAS28 was 3.1 (range, 0.1-6.5). The median precourse baseline DAS28 before the second and third courses were 4.6 (range, 1.7-7.8) and 4.24 (range, 1.7-7.2), respectively. The number of previously failed tumor necrosis factor inhibitors did not predict response to RTX in this patient cohort with extensive use of previous disease-modifying antirheumatic drugs (median = 6).
The treatment as-needed regimen used in this study cohort led to delayed RTX retreatment and disease flare in a significant proportion of patients. A regular retreatment every 6 months, at least, after the first 2 treatment courses in patients who are not in remission could allow better control of disease activity.