Deletion of WWOX, a tumor suppressor gene, is frequent in esophageal adenocarcinoma (32%) and stomach adenocarcinoma (30.2%) and also observed in other human cancer types such as colon adenocarcinoma, bladder urothelial carcinoma and lung adenocarcinoma (Hussain et al., 2019). This evidence concerns the gene WWOX and bladder transitional cell carcinoma.