Die Fr�hinstillation des Harnblasenkarzinoms

Bioluminescence imaging to monitor bladder cancer cell adhesion in vivo: a new approach to optimize a syngeneic, orthotopic, murine bladder cancer model

OBJECTIVE

To improve the orthotopic murine bladder cancer model by using bioluminescent (BL) MB49 tumour cells for noninvasive in vivo monitoring of tumour growth and to examine the efficacy of integrin receptor-blocking oligopeptides on preventing tumour cell adhesion in this improved bladder cancer model.

MATERIALS AND METHODS

The capacity of oligopeptide combinations to interfere with tumour cell adhesion was assessed in vivo in a syngeneic, orthotopic, murine bladder cancer model. Tumour outgrowth was monitored noninvasively by bioluminescence imaging (BLI) after administration of luciferase-expressing MB49(LUC) bladder cancer cells. The presence of tumour cells was verified histologically and immunohistochemically on paraffin wax-embedded sections of excised bladders.

RESULTS

Anti-adhesive oligopeptides effectively inhibited tumour outgrowth. BLI detected tumour cells at an early stage when there were no clinical signs of cancer in any of the mice. The technique has high sensitivity in detecting tumour cell implantation, but is less reliable in assessing tumour volume in advanced-stage disease due to light attenuation in large tumours.

CONCLUSIONS

Peptides targeting adhesion molecules prevent attachment of bladder cancer cells to the injured bladder wall. BLI is a sensitive method for detecting luminescent bladder cancer cells in an orthotopic mouse model.

Persistence, recurrence, and progression rates of superficial bladder tumours after resection using the differentiated technique

OBJECTIVE

To investigate whether the differentiated resection technique for excising superficial bladder cancer leads to higher recurrence and progression rates as compared with regular resection.

SUBJECTS AND METHODS

We evaluated 163 patients, 66 undergoing a differentiated and 97 a regular resection. All patients underwent a routine second resection within 6-10 weeks. Recurrence and progression rates as well as tumour persistence on second resection were analyzed.

RESULTS

Patients with differentiated resections of bladder tumours did not have higher tumour recurrence and progression rates. Also, these patients had a significantly higher percentage of tumour-free second resections (p = 0.03).

CONCLUSION

The differentiated resection technique for excising superficial bladder cancer has no negative influence on recurrence and progression rates, but it leads to a reduced tumour persistence.