Figure 2A–E demonstrates that three collagen-related genes were found to be differently expressed in genitourinary tumors such as bladder cancer (BLCA), clear cell renal cell cancer (ccRCC/KIRC), and prostate cancer (PRAD). Moreover, the expression of FN1 was found to be significantly differently expressed in KIRC and PRAD, while IL6 was significantly differently expressed in BLCA, KIRC, and PRAD (p < 0.1 was considered statistically significant according to the TIMER database). Here, IL6 is linked to urinary bladder carcinoma.