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Updated: Aug 8, 2026

An Orthotopic Bladder Cancer Model for Gene Delivery Studies
Published on: December 1, 2013
Role of P-glycoprotein in chemoresistant superficial bladder tumours
V H Nargund1, J Lowe, G M Flannigan
1Department of Pathology, Bradford Royal Infirmary, UK.
Objective:
The drug resistance at cellular level is mediated by P-glycoprotein (P-G), which is variably expressed in bladder tumours. The effect of intravesical chemotherapy on P-G status was studied in chemoresistant and recurrent superficial tumours which progressed to metastasis or needed further treatment.
Methods:
Archival histological materials of 14 patients who received intravesical epirubicin for recurrent superficial transitional cell carcinoma of the bladder were studied for the presence of P-G using monoclonal antibody JSB-1.
Results:
Four patients showed complete absence of P-G following chemotherapy although only 2 patients were recurrence-free. In 4 patients with extravesical metastasis, there was no evidence of increased P-G expression.
Conclusions:
The P-glycoprotein expression is not related to histological grading or clinical progression of bladder tumours.
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