Through protein-protein interaction network analysis [29] with these 141 significant TWAS risk genes, we detected gene networks comprised of known AD risk genes such as APOC2, BIN1, CASS4, MS4A4A, MS4A6A, SLC24A4, and MAPT and additional risk genes that are not mapped in the GWAS Catalog. Here, CASS4 is linked to Alzheimer disease.