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Analysis of genetic and epigenetic processes that influence p14ARF expression in breast cancer
J Silva1, G Domínguez, J M Silva
1Department of Medical Oncology, Clínica Puerta de Hierro, E-28035-Madrid, Spain.
Abstract:
The INK4a/ARF locus encodes two unrelated cell cycle-regulatory proteins that both function in tumor suppression, p16INK4a and p14ARF. In human tumors including breast cancer, alterations affecting selectively p14ARF have been poorly analysed. We have performed a comprehensive analysis of the inactivation mechanisms (mutation, homozygous and hemizygous deletion, and promoter hypermethylation) in a large series of 100 primary breast carcinomas. RT-PCR showed expression variable of the p14ARF transcript, with 17% demonstrating overexpression and 26% demonstrating decreased expression. No detectable alterations were observed in the majority of cases with overexpressed p14ARF mRNA, but 77% of tumors with decreased expression presented at least one of these genetic/epigenetic alterations. Nevertheless, a statistically significant correlation was observed between decreased p14ARF expression and several poor prognostic parameters.
Insights
This study investigated alterations in the p14ARF tumor suppressor gene in breast cancer. Decreased p14ARF expression was linked to genetic/epigenetic changes and poorer patient prognosis.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- The INK4a/ARF locus is crucial for tumor suppression, encoding p16INK4a and p14ARF.
- Alterations in p14ARF, a key tumor suppressor, are understudied in breast cancer.
Purpose of the Study:
- To comprehensively analyze p14ARF inactivation mechanisms in primary breast carcinomas.
- To correlate p14ARF expression levels with genetic/epigenetic alterations and patient prognosis.
Main Methods:
- Analysis of mutation, deletion (homozygous and hemizygous), and promoter hypermethylation of p14ARF.
- Quantitative assessment of p14ARF mRNA expression using RT-PCR in 100 breast cancer samples.
Main Results:
- Variable p14ARF transcript expression observed, with 17% showing overexpression and 26% decreased expression.
- 77% of tumors with decreased p14ARF expression exhibited genetic/epigenetic alterations.
- A significant correlation was found between reduced p14ARF expression and poor prognostic indicators.
Conclusions:
- p14ARF inactivation mechanisms, including genetic and epigenetic alterations, are relevant in breast cancer.
- Decreased p14ARF expression is associated with adverse prognostic parameters in breast cancer patients.