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<dc:title xml:lang="fr">Étude de l’impact des stratégies thérapeutiques chez le sujet âgé de plus de 50 ans atteint de sclérose en plaques</dc:title>
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<dc:subject xml:lang="fr">Sclérose en plaques</dc:subject>
<dc:subject xml:lang="fr">Immunosénescence</dc:subject>
<dc:subject xml:lang="fr">Neuroprotection</dc:subject>
<dc:subject xml:lang="fr">Stratégies thérapeutiques et méthodes causales</dc:subject>
<dc:subject xml:lang="en">Multiple sclerosis</dc:subject>
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<dcterms:abstract xml:lang="fr">La prise en charge des patients atteints de sclérose en plaques (SEP) âgés de plus de 50 ans pose des dilemmes cliniques du fait que l’activité de la SEP diminue avec l’âge et que le risque de survenue d’infections opportunistes et de développement néoplasique augmente. Dans cette thèse, nous évaluons via différentes méthodes d’estimation causale : l’impact des traitements anticancéreux sur le devenir de la SEP chez des patients atteints de SEP et de cancer, l’effet de l’arrêt thérapeutique des traitements de haute efficacité (HET) chez le patient stable après 50 ans et l’effet des stratégies d’escalade et d’induction chez les patients à début tardif (après 50 ans). Nos résultats montrent un effet protecteur global des chimiothérapies sur le risque de survenue de poussées, un effet délétère de l’arrêt de l’HET sur l’activité de la maladie et un risque accru de survenue de poussées avec le choix d’une stratégie d’escalade plutôt que d’induction.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The management of patients with multiple sclerosis (MS) over 50 presents clinical dilemmas, as MS activity decreases with age whilst the risk of opportunistic infections and neoplastic development increases. In this thesis, we use various causal inference methods to assess : impact of anticancer treatments on the course of MS among patients with both MS and cancer, effect of discontinuing high-efficacy treatments (HET) among stable patients over 50, and effect of escalation versus induction strategies among patients with late-onset MS (after the age of 50). Our results show an overall protective effect of chemotherapies on relapse risk, a deleterious effect of discontinuing HET on disease activity and an increased risk of relapse when choosing an escalation strategy rather than an induction strategy.</dcterms:abstract>
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