IL6 and chronic cystitis: ↑ IL-6/IL6 in BlCa patients than normal tissues or cystitis patients (Chen et al., 2013); ↑ in early stages than non-malignant disease (Chen et al., 2013); ↑ was mostly associated in MIBC tissues (Chen et al., 2013); IL-6 is expressed in non-malignant tissues (Chen et al., 2013)