# Domain Expert Assessment: EV-Derived Biomarkers for Early/Prodromal AD
## 1. Hypotheses with Highest Translational Potential
### Tier 1: NDEV p-Tau Species (Strongest, but requires precision correction)
NDEV-derived phospho-tau remains the most translationally advanced EV concept, but the current framing conflates evidence across epitopes in ways that would undermine credibility with regulatory reviewers or clinical collaborators. The p-tau231 hypothesis is mechanistically interesting but the evidentiary base is substantially weaker than for p-tau181. If pursued, it must be presented as a next-generation hypothesis building on p-tau181, not as independently validated.
### Tier 2: NDEV Synaptic Proteins (Most differentiated from plasma assays)
GAP-43, neurogranin, and synaptotagmin-