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p16(INK4a) expression in urinary bladder carcinoma
Maria Rosaria Raspollini1, Gabriella Nesi, Gianna Baroni
1Department of Human Pathology and Oncology, University of Florence, Florence, Italy.
Abstract:
The most common genetic damage in urothelial carcinoma is partial loss of chromosome 9. The area around 9p21 where the CDKN2A/ARF gene is located is one of the major sites for deletion. This gene encodes for p16 protein which impedes the cell cycle. Specific binding of the p16 product to the cyclin-dependent protein kinases cdk4 or cdk6 inhibits the catalytic activity of the cyclin D-cdk complex, and consequently arrests the cell cycle at the G1/G2 phase. This study aims to immunohistochemically assess p16 expression in urothelial carcinoma in order to evaluate the correlation of this biological marker with tumour stage and/or grade. We studied specimens of transurethral resection (TURB) from 17 cases of non-invasive papillary urothelial carcinoma and from 22 cases of invasive urothelial carcinoma of the bladder. We observed strong p16 immunoreactivity in 11 cases (28.2%), while 28 cases (71.8%) did not show p16 staining. The expression of p16 was statistically associated with disease stage (p = 0.026, according to the chi-square test), but not with either tumour grade or disease progression. These observations call for further studies to focus the importance of p16 expression in bladder cancer development and/or progression. Additional data may provide insight into treatment guided by molecular changes.
Insights
Loss of chromosome 9 is common in urothelial carcinoma. This study found p16 expression is linked to bladder cancer stage, suggesting its role in tumor development.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- Urothelial carcinoma frequently exhibits genetic damage, particularly loss of chromosome 9.
- The CDKN2A/ARF gene at 9p21, encoding the cell cycle inhibitor p16, is a common deletion site.
- p16 protein inhibits cyclin D-cdk complexes, arresting the cell cycle at the G1/G2 phase.
Purpose of the Study:
- To immunohistochemically assess p16 expression in urothelial carcinoma.
- To evaluate the correlation between p16 expression and tumor stage and grade.
- To investigate the potential role of p16 in bladder cancer progression.
Main Methods:
- Immunohistochemical analysis of p16 expression.
- Study of transurethral resection specimens from 17 non-invasive and 22 invasive urothelial carcinoma cases.
- Statistical analysis using the chi-square test to assess correlations.
Main Results:
- Strong p16 immunoreactivity was observed in 28.2% of cases; 71.8% showed no p16 staining.
- p16 expression was statistically associated with disease stage (p = 0.026).
- No significant association was found between p16 expression and tumor grade or disease progression.
Conclusions:
- p16 expression is statistically linked to the stage of urothelial carcinoma.
- Further research is needed to elucidate the precise role of p16 in bladder cancer development and progression.
- p16 expression may offer insights into molecularly guided treatment strategies.
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