CCL2 and Alzheimer disease: In addition, with regard to the correlation between the level of serum inflammatory factors and the ability of language and memory in patients with AD, the results of this study indicated that there exhibited no significant correlation between the levels of serum IL-4, IL-6, IL-10, TNF-α, CCL-2, and TNF-β and the scores of long-term delayed recognition, delayed memory, and instantaneous memory in the AD group [25].