KLF4 and triple-A syndrome: First, we used the LASSO regression algorithm to identify six genes from the grey60 module as diagnostic markers for PVAT around AAA, including EGR1, DUSP1, CYR61, FOSB, KLF4, and CREB5 (Figures 5A,B); eight genes were obtained from the grey60 module by the SVM-RFE algorithm as diagnostic markers, including APOLD1, PLA2G2A, NR4A2, EGR1, KLF4, CCL8, CCL3L3, and FOS (Figure 5C); we also used the RF algorithm to identity eight genes from the grey60 module as diagnostic markers, including FOS, EGR1, DUSP1, CYR61, FOSB, JUN, KLF4, and CREB5 (Figure 5D).