CCL2 and Alzheimer disease: Other candidates include pro- and anti-inflammatory serum interleukins, which are also associated with risk for AD (Sokolova et al., 2009; Khan et al., 2023), and CSF monocyte chemoattractant protein-1 (MCP-1), which is associated with risk for both AD (Sokolova et al., 2009) and PD (Santaella et al., 2020).