UBQLN4 and esophageal squamous cell carcinoma: UBQLN4 expression in primary ESCC tumors (n = 59) was significantly higher than normal adjacent esophageal epithelia (n = 10, H‐score = 82.0 ± 78.9 versus 12.2 ± 10.2, P < 0.0001, Fig. 4E,F).