Efficacy, Safety, and Immunogenicity of Biosimilar Etanercept (Enerceptan) Versus Its Original Form in Combination With Methotrexate in Patients With Rheumatoid Arthritis: A Randomized, Multicenter, Evaluator-Blinded, Noninferiority Study.

BACKGROUND: Enerceptan (EtaBS) has been developed as a proposed biosimilar of etanercept. METHODS: This randomized, multicenter, evaluator-blinded, noninferiority study conducted in Argentina included adults with active, moderate, and severe rheumatoid arthritis with inadequate response to methotrexate. Subjects were randomly assigned to 32 weeks treatment with EtaBS (n = 99) or etanercept (n = 51) at a weekly 50-mg dose administered subcutaneously. Patients were categorized according to prior use of biologic disease-modifying antirheumatic drugs and concomitant use of steroids. The primary efficacy endpoint was ACR20 response rate at week 32. Safety, immunogenicity, and steady-state concentration of both drugs were evaluated. The noninferiority margin for ACR20 was estimated at 12%. RESULTS: In the per-protocol population, 85 subjects (92.4%) treated with EtaBS and 44 subjects (93.6%) treated with etanercept achieved ACR20 (difference, -1.2%; 95% confidence interval, -10.1% to 7.6%). Frequent adverse drug reactions occurred in 34.3% and 38% of subjects treated with EtaBS and etanercept, respectively. The most common reaction was upper respiratory tract infection. Six and 3 serious adverse events occurred in 4 and 3 subjects treated with EtaBS and etanercept, respectively. Injection site reactions occurred in 67.7% and 66.0% of subjects treated with EtaBS and etanercept, respectively. Two subjects treated with EtaBS and 1 subject treated with etanercept developed antibodies by week 32. CONCLUSIONS: Efficacy outcomes for EtaBS were noninferior to original etanercept in patients with moderate-to-severe rheumatoid arthritis with inadequate response to methotrexate. Safety and immunogenicity results were comparable between the two. This study is a major step toward improving access to biologics in Latin America.

The prevalence of rheumatoid arthritis in Argentina: a capture-recapture study in a city of Buenos Aires province.

OBJECTIVE: The objective of this study was to assess the prevalence of rheumatoid arthritis (RA) in the population of a city of 70,000 inhabitants located in Buenos Aires, Argentina. METHODS: Based on the hypothesis that RA is an underdiagnosed disease in Argentina, a capture-recapture method was applied. A local registry of RA patients of Luján City was taken as the primary source; a telephone survey was specifically carried out as a secondary source of information. Patients suspected of having RA were referred to a local hospital to be examined by a team of 12 rheumatologists. Anamnesis and physical examination were followed by hand and foot radiography and erythrocyte sedimentation rate and rheumatoid factor measurements. RESULTS: According to the American College of Rheumatology criteria, a prevalence rate of 0.94% (95% confidence interval [CI], 0.86%-1.02%) was found in the surveyed population; in agreement with other studies, this prevalence was higher in women when compared with men (for female, 1.54% [95% CI, 1.40%-1.69%]; for male, 0.40% [95% CI, 0.32%-0.49%]). CONCLUSION: The prevalence of RA in a representative sample of the population of a city from the central region of Argentina seems to be close to 1%.

Eficacia, tolerabilidad y seguridad de la ciclosporina para microemulsion en el tratamiento de la artritis reumatoidea activa: estudio abierto / Efficacy, tolerability and safety of cyclosporine for microemulsion in the treatment of the active rheumatoid arthritis: open study

La ciclosporina para microemulsión (cpm) ha sido ampliamente utilizada para el tratamiento de la ar- tritis reumatoidea (AR) con muy buenos resultados sobre la progresión del daño articular según ha sido informado por el grupo de estudio GRISAR1. Para evaluar eficacia, seguridad y tolerabilidad de la cpm en el tratamiento de la AR un grupo local de 12 centros (50 pacientes), realizó un estudio abierto, prospectivo (Neo-Ra-02), de seis meses de seguimiento. Los parámetros considerados para evaluar la eficacia fueron: modificación de la rigidez matutina, pruebas funcionales (índices de HAQ, Ritchie y Lee), de laboratorio y radiológicos (índice de Larsen). Los parámetros usados para evaluar la seguridad fueron: tensión arterial y determinaciones de laboratorio de función renal, hepática y análisis hematológico. Los criterios para la participación de los pacientes fueron: presencia de AR activa (según definición del ACR), estadios anatómicos y funcionales de Steinbrocker del I al III, evolución de la enfermedad no mayor de 5 años, ausencia de historia previa de hipertensión arterial, enfermedad renal o hepática y ausencia de uso de drogas modificadoras de la enfermedad en los dos meses anteriores al estudio. A las 4 semanas del tratamiento se verificó disminución estadísticamente significativa del dolor, rigidez matutina, scores de sensibilidad, entumecimiento articular e índice de Ritchie. No hubo incremento significativo de la creatinina, ni del ácido úrico séricos. Seis casos desarrollaron hipertensión arterial leve. La cpm demostró eficacia con mínima incidencia de efectos adversos (12 por ciento de hipertensión arterial leve) cuando su administración fue en dosis bajas y adecuadamente monitoreada.