SFRP4 and posterior cortical atrophy: After the intersection of DEGs and prognosis-related genes in the GEO and TCGA databases, and the MIDS-related genes (Figures 2A–C), CXCL14, SFRP4, and CD38 were eventually identified to classify the PCa patients in the TCGA database into two distinct clusters (Figure 2D; consensus matrix k = 2).