Exhibit 99.1 ProMIS Neurosciences Announces Full Year 2023 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 – April 1, 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 as ...