Diacerein for the treatment of rheumatoid arthritis in patients with inadequate response to methotrexate: a pilot randomized, double-blind, placebo-controlled add-on trial.

OBJECTIVE: To evaluate the efficacy and safety of diacerein in patients with rheumatoid arthritis (RA) who are methotrexate inadequate responders (MTX-IR). METHOD: In this pilot, multicenter, double-blind, placebo-controlled trial, MTX-IR RA patients were randomized to either diacerein or matching placebo as add-on treatment to MTX for 24 weeks. Efficacy and safety were evaluated every 4 weeks until week 28. Primary and secondary efficacy endpoints were the percentage of patients achieving the ACR20 criteria and a moderate EULAR response at week 24, respectively. RESULTS: Forty patients were equally randomized to both study treatments; 16 and 19 participants completed the study in the diacerein and the placebo arms, respectively. Baseline characteristics were similar in both groups, except that tender joint count, DAS28-ESR score, and non-steroidal anti-inflammatory drug consumption were higher in the placebo arm. The ACR20 response at week 24 was similar in the diacerein and placebo groups (65% vs 45%, P = .20). However, treatment response according to the EULAR criteria was better in patients taking diacerein (75% vs 25% of moderate response, P = .002). In the 35 patients with assessments through week 28, diacerein was superior to placebo in ACR20 at weeks 24 and 28 (both 81% vs 47%, P = .04). Incidence of adverse events was comparable in both arms, with only chromaturia being more common with diacerein than placebo (40% vs 10%, P = .03). CONCLUSIONS: These preliminary results show the potential benefits of diacerein on pain, joint function, and disease activity in MTX-IR RA patients. TRIAL REGISTRATION: ClinicalTrials.gov Identifier: NCT01264211 Key Points • Diacerein has shown positive effects on rheumatoid arthritis symptoms. • A good safety profile of diacerein has been observed when it was administered as add-on therapy to methotrexate in patients with rheumatoid arthritis.

Guidelines for the conduct of pharmacological clinical trials in hand osteoarthritis: Consensus of a Working Group of the European Society on Clinical and Economic Aspects of Osteoporosis, Osteoarthritis and Musculoskeletal Diseases (ESCEO).

OBJECTIVES: To gather expert opinion on the conduct of clinical trials that will facilitate regulatory review and approval of appropriate efficacious pharmacological treatments for hand osteoarthritis (OA), an area of high unmet clinical need. METHODS: The European Society on Clinical and Economic Aspects of Osteoporosis, Osteoarthritis and Musculoskeletal diseases (ESCEO) organized a working group under the auspices of the International Osteoporosis Foundation (IOF) and the World Health Organization (WHO). RESULTS: This consensus guideline is intended to provide a reference tool for practice, and should allow for better standardization of the conduct of clinical trials in hand OA. Hand OA is a heterogeneous disease affecting different, and often multiple, joints of the thumb and fingers. It was recognized that the various phenotypes and limitations of diagnostic criteria may make the results of hand OA trials difficult to interpret. Nonetheless, practical recommendations for the conduct of clinical trials of both symptom and structure modifying drugs are outlined in this consensus statement, including guidance on study design, execution, and analysis. CONCLUSIONS: While the working group acknowledges that the methodology for performing clinical trials in hand OA will evolve as knowledge of the disease increases, it is hoped that this guidance will support the development of new pharmacological treatments targeting hand OA.

Clinical trials of new drugs for the treatment of rheumatoid arthritis: focus on early disease.

The European Society for Clinical and Economic Aspects of Osteoporosis, Osteoarthritis and Musculoskeletal Diseases convened a task force of experts in rheumatoid arthritis (RA) and clinical trial methodology to comment on the new draft 'Guideline on clinical investigation of medicinal products for the treatment of RA' released by the European Medicines Agency (EMA). Special emphasis was placed by the group on the development of new drugs for the treatment of early RA. In the absence of a clear definition of early RA, it was suggested that clinical investigations in this condition were conducted in disease-modifying antirheumatic drugs naïve patients with no more than 1 year disease duration. The expert group recommended using an appropriate improvement in disease activity (American College of Rheumatology (ACR) or Simplified/Clinical Disease Activity Index (SDAI/CDAI) response criteria) or low disease activity (by any score) as primary endpoints, with ACR/European League Against Rheumatism remission as a secondary endpoint. Finally, as compelling evidence showed that the Disease Acrivity Score using 28-joint counts (DAS28) might not provide a reliable definition of remission, or sometimes even low disease activity, the group suggested replacing DAS28 as a measurement instrument to evaluate disease activity in RA clinical trials. Proposed alternatives included SDAI, CDAI and Boolean criteria.