Conversely, three inflammatory proteins exhibited a protective effect against AD, including NRTN (OR: 0.91, 95% CI: 0.85–0.99; p = 0.019), CCL4 (OR: 0.95, 95% CI: 0.91–1.00, p = 0.029), and MMP1 (OR: 0.93, 95% CI: 0.87–1.00, p = 0.049). Here, CCL4 is linked to Alzheimer disease.