The Use of Tocilizumab in Combination with Methotrexate in Indonesian Rheumatoid Arthritis Patients (PICTURE INA Study)

Abstract

Background Aim of this research is to assess the efficacy and safety of tocilizumab (TCZ) in combination with methotrexate (MTX) in Indonesian patients with moderate to severe active rheumatoid arthritis (RA) who have an inadequate response to non-biologic DMARDs.Methods This was a interventional, prospective, single arm, multicenter, study in  Indonesian male or female patients aged ≥ 18 years old, with a diagnosis of RA for > 6 months based on ACR 1987 revised criteria with moderate to severe disease activity (DAS28 score > 3.2) after ≥ 12 weeks of non-biologic DMARDs treatment. The treatment consisted of tocilizumab, 8 mg/kg, intravenous (IV), every 4 weeks for a total of 6 infusion in combination with oral MTX (10−25 mg) every week. Efficacy was assessed based on the percentage of patients achieving low disease activity state (DAS28 < 3.2), percentage of patients achieving reduction > 1.2 point of DAS28, percentage of patients achieving remission (DAS28 < 2.6), and percentage of patients with ACR20, ACR50, and ACR70 responses. Descriptive statistics will be used for presentation of results.Results 100% patients reached low disease activity (DAS28 ≤ 3.2) at last study visit (week 24) and clinically significant improvement (reduction at least 1.2 units) at every visit in DAS28, both for ITT or PP patients. Remission (DAS28 < 2.6) was observed in 82.1% (ITT patients) and 93.1 % (PP patients) on last study visit. ACR20, ACR50, and ACR70 were achieved in 20%, 34%, and 34% (ITT patients), and 7%, 24%, and 62% (PP patients) on week 24. There were 3 out of 39 patients (7.69%) with adverse events (AE) and serious adverse events (SAE) that resulted in discontinuation of TCZ treatment, consisting of 1 patient with SAE of sepsis ec acquired community pneumonia, 1 patient with SAE of pneumonia tuberculosis, and 1 patient with AE of candidiasis. Most common adverse events were hepatic dysfunction (30.7%), hypercholesterolemia (23.1%), followed by arthralgia (20.5%) Twelve percent of patients needed dose modification due to elevated liver enzyme (elevated ALT/SGPT level).Conclusion Tocilizumab seems to be efficacious and likely to have good safety profile in non- biologic DMARD nonresponsive RA patients of PICTURE INA study.   Keywords: Rheumatoid Arthritis, Tocilizumab, DMARD, DAS28