FURIN and head and neck squamous cell carcinoma: Compared with FURIN expression in normal tissues, its expression levels were relatively higher in bladder urothelial carcinoma (BRCA), esophageal carcinoma (ESCA), head and neck squamous cell carcinoma (HNSC), lung adenocarcinoma (LUAD), stomach adenocarcinoma (STAD), and uterine corpus endometrial carcinoma (UCEC).