Compared to HC samples, mild AD samples had significantly elevated levels of events labeled with antibodies against tau (P = 0.0108), p‐tau231 (P < 0.0001), p‐tau181 (P < 0.0001), p‐tau217, p‐tauS235 (P = 0.0001), p‐tauS202‐T205 (P = 0.0061), alpha‐synuclein (P = 0.0200), and LAMP1 (P = 0.0046). Here, LAMP1 is linked to Alzheimer disease.