Related Experiment Video
Updated: Aug 4, 2026
06:23
A Murine Orthotopic Bladder Tumor Model and Tumor Detection System
Published on: January 12, 2017
In vivo fluorescence detection of human bladder carcinoma without sensitizing agents
M A D'Hallewin1, L Baert, H Vanherzeele
1Department of Urology at St. Pieter University Hospital, Catholic University of Leuven, Belgium.
The Journal of the American Paraplegia Society
|October 1, 1994
Summary
This study introduces a new cystoscopic tool for detecting bladder cancer without sensitizing agents. The novel method enhances tumor visualization, improving early diagnosis for high-risk patients.
Area of Science:
- Urology
- Medical Optics
- Oncology
Background:
- Diagnosing bladder cancer, particularly carcinoma in situ, is challenging in patients with spinal cord disorders due to inflammation from catheters, infections, or stones.
- Current fluorescence tagging methods using sensitizing agents like hematoporphyrin derivatives improve visualization but have patient drawbacks.
- There is a need for improved, non-invasive diagnostic techniques for bladder cancer detection.
Purpose of the Study:
- To develop and evaluate a novel cystoscopic fiber optic instrument for in vivo detection of human bladder carcinoma.
- To assess the efficacy of using tissue autofluorescence upon UV excitation for bladder tumor demarcation.
- To compare the diagnostic performance of this new method with existing techniques, including those using photosensitizers.
Main Methods:
- Development of a cystoscopic fiber optic instrument utilizing a mercury arc lamp for UV excitation (365 nm).
- Detection of tissue autofluorescence for in vivo imaging of the bladder.
- Quantification of demarcation contrast ratios for carcinoma in situ and transitional cell carcinoma.
Main Results:
- The developed instrument enables in vivo detection of human bladder carcinoma without sensitizing agents.
- Autofluorescence detection yielded demarcation contrast ratios of 2.6 for carcinoma in situ and 3.2 for transitional cell carcinoma.
- This demarcation ratio is 60% higher than ratios obtained after photosensitizer injection, indicating superior contrast.
Conclusions:
- The novel cystoscopic instrument offers a reliable, non-invasive method for diagnosing bladder carcinoma, including carcinoma in situ.
- The technique enhances tumor visualization through tissue autofluorescence, surpassing the contrast of photosensitizer-based methods.
- Integration with therapies like Nd:YAG laser irradiation facilitates cost-effective preventive care for high-risk individuals.
