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PRX012

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PRX012 is a high-affinity monoclonal antibody developed by [Prothena Biosciences](https://www.prothena.com) targeting [amyloid-beta](/proteins/amyloid-beta) (Aβ) for the treatment of [Alzheimer's disease](/diseases/alzheimers-disease) (AD)[@prothena2024]. Unlike previous generation amyloid antibodies that primarily target either soluble protofibrils ([lecanemab](/entities/lecanemab)) or deposited plaques ([donanemab](/entities/donanemab), [aducanumab](/entities/aduhelm)), PRX012 is designed to bind with high affinity to multiple forms of Aβ, including monomers, oligomers, and fibrils, with particular selectivity for toxic oligomeric species[@sperling2023]. The antibody represents Prothena's strategic focus on the [amyloid cascade hypothesis](/mechanisms/amyloid-cascade) and builds on the company's expertise in protein aggregation biology. PRX012 entered clinical development following extensive preclinical characterization demonstrating robust target engagement and amyloid-reducing activity in animal models. The drug is being evaluated in Phase 1b/2 studies in patients with early [Alzheimer's disease](/diseases/alzheimers-disease)[@salloway2024].

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📊 Evidence Profile
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Certainty
10%
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2
Outgoing
11
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