As shown in Figure 1, the results from the database showed that PIF1 was significantly upregulated in 21 out of all 33 cancer types compared with normal tissues, such as testicular germ cell tumor (TGCT), bladder urothelial carcinoma (BLCA), cervical squamous cell carcinoma and endocervical adenocarcinoma (CESC). Here, PIF1 is linked to bladder transitional cell carcinoma.