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Molecular mechanisms in urinary bladder carcinogenesis.

D Volanis¹, G Papadopoulos, K Doumas

¹Department of Urology, "Asklipieio" General Hospital, Voula, Athens, Greece.

Journal of B.U.ON. : Official Journal of the Balkan Union of Oncology

|February 15, 2012

Summary

Genetic factors influence bladder cancer development, with specific DNA alterations like loss of heterozygosity (LOH) and microsatellite instability (MSI) aiding early diagnosis and predicting tumor behavior.

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Magnetic Resonance Imaging Assessment of Carcinogen-induced Murine Bladder Tumors

Magnetic Resonance Imaging Assessment of Carcinogen-induced Murine Bladder Tumors

Published on: March 29, 2019

Area of Science:

Oncology
Genetics
Molecular Biology

Background:

Urinary bladder cancer (UCC) represents about 5% of new cancer diagnoses globally.
Environmental factors like smoking and occupational exposures are key risks, but individual susceptibility varies.
Genetic susceptibility, including variations in DNA repair capacity, plays a crucial role in unpredictable cancer development.

Purpose of the Study:

To explore genetic and epigenetic alterations in urinary bladder cancer.
To identify biomarkers for early diagnosis and predicting tumor aggressiveness.
To understand the role of genetic susceptibility in bladder carcinogenesis.

Main Methods:

Analysis of genetic aberrations such as loss of heterozygosity (LOH) at chromosome 9.
Detection of microsatellite instability (MSI) for early diagnosis of urothelial cell carcinoma (UCC).
Investigation of epigenetic modifications, including gene promoter methylation (e.g., p16(INK4A), DAPK).
Examination of alterations in tumor suppressor genes and proto-oncogenes.

Main Results:

Loss of heterozygosity (LOH) at chromosome 9 is an early event in UCC development.
Microsatellite instability (MSI) analysis shows promise for early UCC diagnosis.
Gene silencing via promoter methylation (e.g., p16(INK4A), DAPK) is a significant carcinogenic mechanism.
Alterations in specific genes correlate with uncontrolled cell proliferation, reduced apoptosis, and aggressive UCC phenotypes.

Conclusions:

Genetic and epigenetic alterations are critical in urinary bladder cancer development and progression.
Biomarkers like LOH and MSI can aid in early UCC diagnosis and risk stratification.
Understanding these molecular changes offers potential for breakthroughs in bladder cancer management.