115 research outputs found

    Lability of IgE Levels Early in Life

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    We report a case of a very fast and intriguing decrease in IgE concentrations after exclusion from the diet of any CM lysate in an unusual clinical presentation of cow's milk allergy in an infant. Analysis of IgE kinetics after allergen elimination suggests rapid cessation of IgE biosynthesis and a short IgE half-life

    Antibodies toward infliximab are associated with low infliximab concentration at treatment initiation and poor infliximab maintenance in rheumatic diseases

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    International audienceINTRODUCTION: A proportion of patients receiving infliximab have antibodies toward infliximab (ATI), which are associated with increased risk of infusion reaction and reduced response to treatment. We studied the association of infliximab concentration at treatment initiation and development of ATI as well as the association of the presence of ATI and maintenance of infliximab. METHODS: All patients with rheumatoid arthritis (RA) or spondyloarthritis (SpA) receiving infliximab beginning in December 2005 were retrospectively followed until January 2009 or until infliximab discontinuation. Trough serum infliximab and ATI concentrations were measured at each visit. The patients were separated into two groups: ATI(pos) if ATI were detected at least once during the follow-up period and ATI(neg) otherwise. Repeated measures analysis of variance was used to study the association of infliximab concentration at treatment initiation and the development of ATI. Maintenance of infliximab in the two groups was studied by using Kaplan-Meier curves. RESULTS: We included 108 patients: 17 with RA and 91 with SpA. ATI were detected in 21 patients (19%). The median time to ATI detection after initiation of infliximab was 3.7 months (1.7 to 26.0 months). For both RA and SpA patients, trough infliximab concentration during the initiation period was significantly lower for ATI(pos) than ATI(neg) patients. RA patients showed maintenance of infliximab at a median of 19.5 months (5.0 to 31.0 months) and 12.0 months (2.0 to 24.0 months) for ATI(neg) and ATI(pos) groups, respectively (P = 0.08). SpA patients showed infliximab maintenance at a median of 16.0 months (3.0 to 34.0 months) and 9.5 months (3.0 to 39.0 months) for ATI(neg) and ATI(pos) groups, respectively (P = 0.20). Among SpA patients, those who were being treated concomitantly with methotrexate had a lower risk of developing ATI than patients not taking methotrexate (0 of 14 patients (0%) vs. 25 of 77 patients (32%); P = 0.03). CONCLUSIONS: High concentrations of infliximab during treatment initiation reduce the development of ATI, and the absence of ATI may be associated with prolonged maintenance of infliximab. Thus, trough serum infliximab concentration should be monitored early in patients with rheumatic diseases

    De la sérothérapie aux anticorps recombinants « nus »

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    Les anticorps monoclonaux (Acm) puis l’ingĂ©nierie molĂ©culaire ont rĂ©novĂ© l’antique sĂ©rothĂ©rapie, multipliant les possibilitĂ©s d’intervention thĂ©rapeutique et apportant de nouveaux succĂšs cliniques. Mettre en perspective cette histoire permet de mieux apprĂ©hender l’évolution des concepts qui sous-tendent l’utilisation thĂ©rapeutique des anticorps, tout autant que la maturation de l’outil lui-mĂȘme. Seront abordĂ©s successivement dans cette revue les diffĂ©rents principes de ciblage thĂ©rapeutique, depuis leur conception parfois sĂ©culaire jusqu’aux derniers dĂ©veloppements cliniques : anticorps neutralisant les toxines et les antigĂšnes solubles, anticorps antimicrobiens, anticorps cytotoxiques, anticorps spĂ©cifiques de tumeurs, anticorps modifiant les rĂ©ponses cellulaires, etc. Ce panorama sera enfin l’occasion d’introduire une nouvelle classification pharmacologique de la classe des anticorps thĂ©rapeutiques non conjuguĂ©s

    Nouvelle revue internationale mAbs.

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    H. Watier : membre du comité éditorial de la nouvelle revue internationale mAb

    Polymorphismes de récepteurs Fcg : implications biologiques et cliniques.

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    Biothérapies, immunothérapies, thérapies ciblées, biomédicaments


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    Savoir prĂ©cisĂ©ment dĂ©nommer le progrĂšs mĂ©dical relĂšve de la rigueur scientifique, mais c’est aussi une exigence pour faire communiquer le monde mĂ©dical et scientifique et le grand public. Par leurs succĂšs cliniques considĂ©rables, les anticorps thĂ©rapeutiques sont emblĂ©matiques de ce progrĂšs ; si le terme de sĂ©rothĂ©rapie convenait il y a un siĂšcle, il est devenu obsolĂšte. Sont en revanche apparus rĂ©cemment les termes de biothĂ©rapie, immunothĂ©rapie, thĂ©rapie ciblĂ©e et biomĂ©dicament ; ils englobent tous plus ou moins les traitements par anticorps. Quelle signification ont-ils rĂ©ellement ? Que reprĂ©sentent-ils ? Les conclusions et recommandations tirĂ©es de cette analyse visent Ă  simplifier le paysage, en proposant d’abandonner les termes de biothĂ©rapie et de thĂ©rapie ciblĂ©e, de ne pas utiliser le terme d’immunothĂ©rapie auprĂšs du grand public, et de promouvoir le terme de biomĂ©dicament, en le positionnant bien comme un intermĂ©diaire entre les mĂ©dicaments chimiques et les mĂ©dicaments vivants, qui nĂ©cessitent, eux aussi, d’ĂȘtre bien redĂ©finis

    Les anticorps thérapeutiques (conférence de vulgarisation grand public).

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    International audienc
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