Mdm2 SNP309 G-variant is associated with invasive growth of human urinary bladder cancer
Florian Hitzenbichler1, Christine G Stoehr, Michael Rogenhofer
1Department of Internal Medicine I, Caritas St. Josef Medical Center, University of Regensburg, Regensburg, Germany.
Objective:
Human mouse double minute 2 (Mdm2) is essential in degrading p53 by acting as an ubiquitin ligase and therefore plays a vital role in cell cycle and survival. The G-variant of the Mdm2 SNP309, which is located within the promoter of the Mdm2 gene, increases expression of Mdm2 and thereby inhibits the p53 pathway. Several studies have investigated the influence of this SNP on disease risk and onset of various malignancies. The impact of Mdm2 SNP309 on bladder cancer is still to be established due to inconsistent data.
Methods:
In a case-control study we determined the distribution of Mdm2 SNP309 genotypes in 111 patients with an early-onset bladder cancer (diagnosis <45 years of age), in 113 consecutive bladder cancer patients and in a control group consisting of 140 patients without any malignancy.
Results:
There was no significant association between the allelic distribution of the Mdm2 SNP309 and tumor risk, early onset, gender or grade of the tumor. According to tumor stage we found a significant difference in the distribution of the Mdm2 SNP309 between patients with noninvasive and invasive (≥pT1) tumor growth (p = 0.016). In patients with invasive tumors a significant increase of the G allele was found (T/T vs. T/G + G/G; p = 0.023; OR 2.203, 95% CI 1.111-4.369).
Conclusion:
These data indicate that the G-variant of the Mdm2 SNP309 might influence the development of a more aggressive tumor phenotype in patients with bladder cancer without affecting the overall tumor risk.
Insights
The Mdm2 SNP309 G-variant is linked to more aggressive bladder tumors, not overall cancer risk. This finding suggests a role in tumor progression rather than initiation for bladder cancer patients.
Area of Science:
- Genetics
- Oncology
- Molecular Biology
Background:
- Human mouse double minute 2 (Mdm2) is crucial for degrading p53, regulating cell cycle and survival.
- The Mdm2 SNP309 G-variant increases Mdm2 expression, inhibiting the p53 pathway.
- Previous studies show mixed results on Mdm2 SNP309's impact on various cancer risks.
Purpose of the Study:
- To investigate the association between Mdm2 SNP309 genotypes and bladder cancer risk and characteristics.
- To clarify the inconsistent data regarding Mdm2 SNP309's role in bladder cancer.
Main Methods:
- A case-control study was conducted.
- Genotype distribution of Mdm2 SNP309 was analyzed in 111 early-onset bladder cancer patients, 113 bladder cancer patients, and 140 controls.
- Statistical analysis was performed to assess associations with tumor risk, onset, gender, grade, and stage.
Main Results:
- No significant association was found between Mdm2 SNP309 allelic distribution and overall bladder cancer risk, early onset, gender, or tumor grade.
- A significant difference in Mdm2 SNP309 distribution was observed between non-invasive and invasive (≥pT1) bladder tumors (p = 0.016).
- The G allele was significantly increased in patients with invasive tumors (p = 0.023; OR 2.203).
Conclusions:
- The Mdm2 SNP309 G-variant may contribute to a more aggressive tumor phenotype in bladder cancer.
- This SNP variant does not appear to influence the overall risk of developing bladder cancer.
- Further research is warranted to understand the precise role of Mdm2 SNP309 in bladder cancer progression.
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