PMN ProMIS Neurosciences Inc

ProMIS Neurosciences, Inc. (TSX: PMN) (OTCQB: ARFXF), a biotechnology company focused on the discovery and development of antibody therapeutics targeting misfolded proteins such as toxic oligomers, announced today that PMN310, its lead antibody therapeutic candidate for Alzheimer’s disease (AD), showed a significant cognitive benefit in a widely recognized animal model of AD.

The APP/L mouse is a “transgenic” model of AD in which human amyloid-beta oligomers lead to cognitive deficits. In this model, treatment with PMN310 which selectively targets toxic oligomers of amyloid-beta preserved memory using the water maze readout, to the extent that the PMN310 treated mice were indistinguishable from “non-transgenic” control mice.      “This model closely aligns with the most current understanding of the biology of Alzheimer’s disease, that small clumps of misfolded amyloid-beta (toxic oligomers) are the most pathogenic species1”, stated Dr. Neil Cashman, ProMIS Chief Scientific Officer. “In our opinion, studies in transgenic mouse models that focus on plaque removal or monomer depletion are not representative of human disease. Indeed, drug candidates that showed plaque reduction in animal models were disappointing in the clinic, and targeting amyloid monomers which worked in these models, universally failed in clinical trials.”

This positive result builds on earlier in vivo data for PMN310. We have previously published2 on the protective activity of PMN310 in a novel object recognition model where toxic oligomers of amyloid-beta are injected in the brain of mice to create a memory deficit. In this model, co-injection of PMN310 prevented the loss of memory caused by toxic oligomers. Commenting on today’s announcement, ProMIS Chairman and CEO, Eugene Williams stated: “The observed positive outcome with systemic administration of PMN310 is very encouraging, as PMN310 is on track for an IND filing by year end in its initial formulation for intravenous/infusion delivery. In parallel, we are also progressing a potential subcutaneous injection form of PMN310.”   

1Cline E et al. 2018. The amyloid- oligomer hypothesis: beginning of the third decade. Journal of Alzheimer’s disease, 64, S567-S610.2Gibbs E et al. 2019.  A rationally designed humanized antibody selective for amyloid beta oligomers in Alzheimer's disease.  Scientific Reports 9: 9870.   https://doi.org/10.1038/s41598-019-46306-5

About ProMIS NeurosciencesProMIS Neurosciences, Inc. is a development stage biotechnology company focused on discovering and developing antibody therapeutics selectively targeting toxic misfolded oligomers implicated in the development and progression of neurodegenerative diseases, in particular Alzheimer’s disease (AD), amyotrophic lateral sclerosis (ALS) and Parkinson’s disease (PD). The Company’s proprietary target discovery engine is based on the use of two complementary computational modeling techniques. The Company applies its molecular dynamics, computational discovery platform -ProMIS™ and Collective Coordinates - to predict novel targets known as Disease Specific Epitopes on the molecular surface of misfolded proteins. ProMIS is headquartered in Toronto, Ontario, with offices in Cambridge, Massachusetts. ProMIS is listed on the Toronto Stock Exchange under the symbol PMN, and on the OTCQB Venture Market under the symbol ARFXFVisit us at www.promisneurosciences.com, follow us on Twitter and LinkedIn

For Investor Relations please contact:Alpine Equity AdvisorsNicholas Rigopulos, Presidentnick@alpineequityadv.comTel. 617 901-0785

The TSX has not reviewed and does not accept responsibility for the adequacy or accuracy of this release. This information release contains certain forward-looking information. Such information involves known and unknown risks, uncertainties and other factors that may cause actual results, performance or achievements to be materially different from those implied by statements herein, and therefore these statements should not be read as guarantees of future performance or results. All forward-looking statements are based on the Company's current beliefs as well as assumptions made by and information currently available to it as well as other factors. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this press release. Due to risks and uncertainties, including the risks and uncertainties identified by the Company in its public securities filings, actual events may differ materially from current expectations. The Company disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

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