Biologic Drugs in Development

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3D medical illustration of amyloid plaques on nerve cell representing Alzheimer's disease pathology and pepinemab SEMA4D antibody neuroinflammation mechanism| Image Credit: © Sebastian Kaulitzki - stock.adobe.com

Vaccinex will present new biomarker data from the Phase 1b/2 SIGNAL-AD trial of pepinemab — a humanized IgG4 monoclonal antibody targeting Semaphorin 4D — at AAIC 2026 in London on July 13, showing that SEMA4D blockade regulates glial biomarkers associated with disease progression in early Alzheimer's disease, while outlining plans for an enlarged Phase 2b SIGNAL-AD2 study.