OCLN and in situ carcinoma: However, neither CIS nor CYS affected Occludin protein expression (CIS group: 1.05 ± 0.22 (p value = 0.99 compared with the control group); 0.1 mM: 1.05 ± 0.12 (p value = 0.99 compared with CIS group); 0.2 mM: 1.10 ± 0.14 (p value = 0.99 compared with CIS group); 0.5 mM: 1.08 ± 0.18 (p value = 0.99 compared with CIS group); 1 mM: 1.07 ± 0.87 (p value = 0.50 compared with CIS group)).