Progression of a series of patients with relapsing-remitting multiple sclerosis treated for 7 years with natalizumab using the "no evidence of disease activity" parameter.

INTRODUCTION: The safety and effectiveness of natalizumab in patients with relapsing-remitting multiple sclerosis (RRMS) has been demonstrated in clinical trials. However, due to the limitations of these trials, it is important to know how the condition behaves under long-term clinical practice conditions. OBJECTIVE: To determine the long-term effectiveness of natalizumab in patients with RRMS by means of annual evaluation of the "no evidence of disease activity" (NEDA) parameter, which includes number of relapses, disability (measured with the Expanded Disability Status Scale), and brain MRI parameters. PATIENTS AND METHODS: We performed a retrospective study of patients with RRMS from 3 centres who were treated with one or more doses of natalizumab. Each year, we evaluated NEDA status and safety based on the percentage of patients who discontinued treatment with natalizumab and experienced adverse reactions. RESULTS: The study included 89 patients, most of whom received treatment for 2 to 4 years, with a follow-up period of up to 7 years. Natalizumab significantly reduces the radiological and clinical progression of the disease, as well as the annual rate of relapses. The NEDA parameter demonstrates the effectiveness of the drug, with values of 75.28% for year one and 66.67% for year 7. Twenty-five patients (28.1%) dropped out after a median of 4 years. Fourteen of these patients (56%) dropped out due to the appearance of anti-JC virus antibodies, either in isolation or associated with another cause. Four dropouts (16%) were due to treatment ineffectiveness, with one patient dying due to progressive multifocal leukoencephalopathy. CONCLUSIONS: Natalizumab is highly effective as measured by the NEDA long-term remission parameter.

Evolución de una serie de pacientes con esclerosis múltiple remitente-recurrente tratados con natalizumab durante 7 años mediante el parámetro no evidencia enfermedad activa / Progression of a series of patients with relapsing-remitting multiple sclerosis treated for 7 years with natalizumab using the “no evidence of disease activity” parameter

Introducción: La efectividad y seguridad de natalizumab en pacientes con esclerosis múltiple remitente recurrente (EMRR) se demostró en ensayos clínicos. Sin embargo, por las limitaciones de estos es importante saber cómo se comporta en condiciones de práctica clínica a largo plazo.ObjetivoConocer la eficacia a largo plazo de natalizumab en pacientes con EMRR mediante la evaluación anual del no evidence of disease activity (NEDA), que incluye número de brotes, discapacidad medida con EDSS y parámetros de RM cerebral.Pacientes y métodosEstudio retrospectivo y multicéntrico (n = 3) de pacientes con EMRR tratados con una o más dosis de natalizumab. Se evaluó el estado NEDA cada año y la seguridad a partir del porcentaje de pacientes que discontinuaron y que presentaron efectos adversos.ResultadosIncluimos 89 pacientes, la mayoría recibieron tratamiento durante 2 a 4 años, con una duración del seguimiento de hasta 7 años. Natalizumab reduce significativamente la progresión radiológica y clínica de la enfermedad, así como la tasa anual de brotes, demostrándose su eficacia con el parámetro NEDA, 75,28% al primer año y 66,67% al séptimo año. Veinticinco pacientes (28,1%) han abandonado el estudio en una mediana de tiempo de 4 años, 14 pacientes (56%) por aparición de anticuerpos contra el virus JC, como causa única o asociada a otro motivo, 4 abandonos (16%) fueron por ineficacia, un paciente falleció a causa de LMP.ConclusionesNatalizumab presenta una alta eficacia medida mediante el parámetro de remisión NEDA a largo plazo. (AU)

Introduction: The safety and effectiveness of natalizumab in patients with relapsing-remitting multiple sclerosis (RRMS) has been demonstrated in clinical trials. However, due to the limitations of these trials, it is important to know how the condition behaves under long-term clinical practice conditions.ObjectiveTo determine the long-term effectiveness of natalizumab in patients with RRMS by means of annual evaluation of the “no evidence of disease activity” (NEDA) parameter, which includes number of relapses, disability (measured with the Expanded Disability Status Scale), and brain MRI parameters.Patients and methodsWe performed a retrospective study of patients with RRMS from 3 centres who were treated with one or more doses of natalizumab. Each year, we evaluated NEDA status and safety based on the percentage of patients who discontinued treatment with natalizumab and experienced adverse reactions.ResultsThe study included 89 patients, most of whom received treatment for 2 to 4 years, with a follow-up period of up to 7 years. Natalizumab significantly reduces the radiological and clinical progression of the disease, as well as the annual rate of relapses. The NEDA parameter demonstrates the effectiveness of the drug, with values of 75.28% for year one and 66.67% for year 7. Twenty-five patients (28.1%) dropped out after a median of 4 years. Fourteen of these patients (56%) dropped out due to the appearance of anti–JC virus antibodies, either in isolation or associated with another cause. Four dropouts (16%) were due to treatment ineffectiveness, with one patient dying due to progressive multifocal leukoencephalopathy.ConclusionsNatalizumab is highly effective as measured by the NEDA long-term remission parameter. (AU)