Although Aβ42/40 was not associated with cognitive decline in the DLB group, GFAP concentration was associated with an annual change of −2.11 MMSE points (95% CI −2.88 to −1.35 MMSE points, p < 0.001) and NfL concentration was associated with an annual change of −2.13 MMSE points (95% CI −2.97 to −1.29 MMSE points, p < 0.001) (Figure 4) after correction for age and sex. This evidence concerns the gene NEFL and Mental deterioration.