SERPINB5 and urinary bladder carcinoma: However, our in vitro study results revealed that TSGH-8301 cells expressed the highest maspin protein levels among the four carcinoma cell lines (RT-4, HT1376, T24, and TSGH-8301), which indicated that maspin expression among the bladder carcinoma cell lines is dependent on the cell type but is not related to the extent of neoplasia in vitro.