HSP90AA1 and Alzheimer disease: The first module (orange), which was correlated with CSF Aβ42 levels, Aβ40 levels, and Aβ38 levels, was enriched for lipoprotein and plasma membrane pathways, with the hub gene HSP90AA1 having been previously shown to be differentially expressed in MCI and AD blood, and is correlated with the levels of various immune cells, whereas in the brain, its expression levels are correlated with α‐ and β‐secretase activity.71