SOX9 and reading: As shown in Figure 5(c), PC4 and SOX9 were positively correlated in many types of cancers, including bladder urothelial carcinoma (BLCA) (r = 0.383, p < 0.001), kidney renal clear cell carcinoma (KIRC) (r = 0.333, p < 0.001), liver hepatocellular carcinoma (LIHC) (r = 0.511, p < 0.001), and rectum adenocarcinoma (READ) (r = 0.334, p < 0.001).