Next, we analyzed the expression levels of these driver genes in GSE21034, which indicated that GSTM2, HAAO, C2orf88, CYP27A1, FAXDC2, HFE, GSTP1, EFS, and WFDC2 were all downregulated in PCa (Figure 8A). The gene discussed is CYP27A1; the disease is posterior cortical atrophy.