[P4–384]: ANTI‐Aβ<sub>X‐40</sub> ANTIBODIES EXERT NEUROPROTECTIVE EFFECT AGAINST Aβ‐OLIGOMER TOXICITY

Montañés, María; Marcos, Ivan; Canudas, Jesús; Lacosta, Ana M.; Pesini, Pedro; Sarasa, Manuel

doi:10.1016/j.jalz.2017.06.2255

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“…Although Aβ 42 is regarded as the most toxic species, other studies have shown that Aβ 40 can also form cytotoxic aggregates [ 9 , 53 , 54 ]. Additionally, it has been observed that the levels of insoluble Aβ 40 in the brain of patients with AD increase substantially in association with the onset of dementia [ 11 , 12 ], and we have found large numbers of degenerating neurons filled with C-terminal fragments of Aβ x-40 (but not Aβ x-42 ) in the entorhinal cortex of AD brains [ 16 ].…”

Section: Discussionmentioning

confidence: 99%

Safety, tolerability and immunogenicity of an active anti-Aβ40 vaccine (ABvac40) in patients with Alzheimer’s disease: a randomised, double-blind, placebo-controlled, phase I trial

et al. 2018

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BackgroundImmunotherapy targeting the amyloid-β (Aβ) peptide is a promising strategy for the treatment of Alzheimer’s disease (AD); however, none of the active or passive vaccines tested have been demonstrated to be effective to date. We have developed the first active vaccine against the C-terminal end of Aβ40, ABvac40, and assessed its safety and tolerability in a phase I clinical trial.MethodsA randomised, double-blind, placebo-controlled, parallel-group, phase I study of ABvac40 was conducted with patients aged 50–85 years with mild to moderate AD. Participants were entered into three separate groups according to time of study entry and were randomly allocated to receive ABvac40 or placebo (overall ratio 2:1). The first group received two half-doses of ABvac40 or placebo, whereas the second and third groups received two and three full doses, respectively. All treatments were administered subcutaneously at 4-week intervals. Patients, carers and investigators were blind to treatment allocation throughout the study. The primary objective was to assess the safety and tolerability of ABvac40 by registering all adverse events (AEs). All patients who received at least one dose of treatment were included in the safety analysis. The secondary objective was to evaluate the immunogenicity of ABvac40 by titration of specific anti-Aβ40 antibodies in plasma.ResultsTwenty-four patients were randomly allocated: 16 patients to the ABvac40 group and 8 patients to the placebo group. All randomised patients completed the study, therefore the intention-to-treat and safety populations were identical. Overall, 71 AEs affecting 18 patients were recorded: 11 (69%) in the ABvac40 group and 7 (88%) in the placebo group (p = 0.6214). Neither incident vasogenic oedema nor sulcal effusion (amyloid-related imaging abnormalities corresponding to vasogenic oedema and sulcal effusions) nor microhaemorrhages (amyloid-related imaging abnormalities corresponding to microhaemorrhages and hemosiderin deposits) were detected throughout the study period in the ABvac40-treated patients. Eleven of 12 (~92%) individuals receiving three injections of ABvac40 developed specific anti-Aβ40 antibodies.ConclusionsABvac40 showed a favourable safety and tolerability profile while eliciting a consistent and specific immune response. An ongoing phase II clinical trial is needed to confirm these results and to explore the clinical efficacy of ABvac40.Trial registrationClinicalTrials.gov, NCT03113812. Retrospectively registered on 14 April 2017.Electronic supplementary materialThe online version of this article (10.1186/s13195-018-0340-8) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 99%

Safety, tolerability and immunogenicity of an active anti-Aβ40 vaccine (ABvac40) in patients with Alzheimer’s disease: a randomised, double-blind, placebo-controlled, phase I trial

et al. 2018

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[P4–384]: ANTI‐Aβ_X‐40 ANTIBODIES EXERT NEUROPROTECTIVE EFFECT AGAINST Aβ‐OLIGOMER TOXICITY

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Safety, tolerability and immunogenicity of an active anti-Aβ40 vaccine (ABvac40) in patients with Alzheimer’s disease: a randomised, double-blind, placebo-controlled, phase I trial

Safety, tolerability and immunogenicity of an active anti-Aβ40 vaccine (ABvac40) in patients with Alzheimer’s disease: a randomised, double-blind, placebo-controlled, phase I trial

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[P4–384]: ANTI‐AβX‐40 ANTIBODIES EXERT NEUROPROTECTIVE EFFECT AGAINST Aβ‐OLIGOMER TOXICITY

Cited by 1 publication

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Safety, tolerability and immunogenicity of an active anti-Aβ40 vaccine (ABvac40) in patients with Alzheimer’s disease: a randomised, double-blind, placebo-controlled, phase I trial

Safety, tolerability and immunogenicity of an active anti-Aβ40 vaccine (ABvac40) in patients with Alzheimer’s disease: a randomised, double-blind, placebo-controlled, phase I trial

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[P4–384]: ANTI‐Aβ_X‐40 ANTIBODIES EXERT NEUROPROTECTIVE EFFECT AGAINST Aβ‐OLIGOMER TOXICITY