ZO-1 mRNA expression appeared to significantly decrease in BC cell lines (5637: 0.29 ± 0.07, UM-UC-3: 0.51 ± 0.04, and T24: 0.21 ± 0.05) over that of noncancer urothelial cell line sv-huc-1 (1.0 ± 0.13, P < 0.05, Figure 2(a)) and to significantly decrease in BC tissue (0.42 ± 0.12) over that of ANTT (1.0 ± 0.19, P < 0.05, Figure 2(b)). Here, TJP1 is linked to breast cancer.