The expression of XDH was higher in bladder urothelial carcinoma, cervical squamous cell carcinoma, endocervical adenocarcinoma, esophageal carcinoma, kidney renal clear cell carcinoma, kidney renal papillary cell carcinoma, lung adenocarcinoma, lung squamous cell carcinoma, and uterine corpus endometrial carcinoma, compared with corresponding normal tissues. Here, XDH is linked to squamous cell lung carcinoma.