Exhibit 99.1 ProMIS Neurosciences Announces First Quarter 2024 Financial Results and Recent Highlights Top-line data from first-in-human Phase 1a clinical trial of PMN310 as a treatment for Alzheimer’s disease on track for mid-2024 CAMBRIDGE, Massachusetts and TORONTO, Ontario – May 14, 2024 – ProMIS Neurosciences Inc. (Nasdaq: PMN), a clinical-stage biotechnology company focused on the generation and development of antibody therapeutics targeting toxic misfolded proteins in neurodegenerative diseases such ...