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In order to elucidate the mechanisms of multidrug resistance (MDR) in bladder cancer, the expression of glutathione S-transferase-π (GST-π) and multidrug resistance associated protein (MRP) in tissue samples resected from 44 patients and 6 normal bladder mucosa as control was de- tected by using immunohistochemical method, and the results were analyzed by computer-assisted im- age analyzing system (IAS) to achieve semi-quantitative data. In addition, correlation between the expression of both factors was studied. The results showed that the positive expression rate of GST- π and MRP in bladder cancer was 72. 7 % (32/44) and 68. 2 % (30/44) respectively, significantly higher than those in normal bladder mucosa, being 16. 7% and 33. 3% respectively. The rate of GST-πpositive staining was increased correspondingly with tumor grade and stage elevated, being higher in recurrent tumors treated by chemotherapy, but not significantly (P>0. 05). There was no significant differences between the expression of MRP and tumors’ behaviors and clinical characters. However, the results demonstrated that the correlation between the expression of both resistant fac- tors was very evident (r=0. 695, P<0. 0025). It was suggested that the activation of GST-π and MRP might occur during malignant transformation of normal mucosa, but tumors’ differentiation and progression could not be the unique factors that influenced both overexpression. Chemotherapy might be another important reason. The correlation of both indicated that there was a common mech- anism regulating their expression probably, which made them play a pivotal role in chemotherapy drug resistance of bladder cancers.
In order to elucidate the mechanisms of multidrug resistance (MDR) in bladder cancer, the expression of glutathione S-transferase-π (GST-π) and multidrug resistance associated protein (MRP) in tissue samples resected from 44 patients and 6 normal bladder mucosa as control was de- tected by using immunohistochemical method, and the results were analyzed by computer-assisted im-analyzing analyzing system (IAS) to achieve semi-quantitative data. In addition, correlation between the expression of both factors was studied. showed that the positive expression rate of GST- π and MRP in bladder cancer was 72. 7% (32/44) and 68.2% (30/44) respectively, significantly higher than those in normal bladder mucosa, being 16. 7 % and 33. 3% respectively. The rate of GST-πpositive staining was significantly correspondingly with tumor grade and stage elevated, being higher in recurrent tumors treated by chemotherapy, but not significantly (P> 0.05). There was no significant differences b etween the expression of MRP and tumors’ behaviors and clinical characters. However, the results demonstrated that the correlation between the expression of both resistant to- was was evident (r = 0. 695, p <0. 0025). It was suggested that the activation of GST-π and MRP might occur during malignant transformation of normal mucosa, but tumors’ differentiation and progression could not be the unique factors that affect both overexpression. Chemotherapy might be another important reason. The correlation of both indicates that there was a common mech- anism regulating their expression probably, which made them play a pivotal role in chemotherapy drug resistance of bladder cancers.