J Cancer 2018; 9(22):4234-4241. doi:10.7150/jca.26050

Research Paper

P53 Codon 72 Polymorphism and Risk for Squamous Cell Carcinoma of the Penis: A Caucasian Case-Control Study

Robert Stoehr1✉, Rebecca Weisser1, Olaf Wendler2, Johannes Giedl1, Khalid Daifalla1, Nadine T. Gaisa3, Georg Richter4, Valentina Campean1,5, Maximilian Burger6, Bernd Wullich7, Arndt Hartmann1

1. Institute of Pathology, University Hospital Erlangen, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany;
2. Department of Otorhinolaryngology - Head and Neck Surgery, University Hospital Erlangen, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany;
3. Institute of Pathology, RWTH Aachen University, Aachen, Germany;
4. Institute of Pathology, Hameln, Germany;
5. Institute of Pathology, Ansbach, Germany;
6. Department of Urology, Caritas St. Josef Medical Center, University of Regensburg, Regensburg, Germany;
7. Department of Urology, University Hospital Erlangen, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany

Abstract

Squamous cell carcinoma of the penis is a rare but often aggressive disease. A large proportion of penile cancers are associated with HPV infection, mainly with HPV high-risk subtypes 16 and 18. From other HPV-related malignancies a link between a functional SNP in the p53 gene (rs1042522, p.Arg72Pro) and a higher disease risk in the presence of HPV is documented. The p53 p.Arg72 variant was described as a risk factor for developing a malignancy in combination with the presence of HPV as the p.72Arg variant is more prone to HPV E6 protein-mediated degradation than the p.72Pro variant. For penile carcinoma there are only sparse data available on this topic. We therefore analyzed the distribution of this p53 codon 72 SNP in a cohort of 107 penile cancer patients and a healthy control group (n=194) using Restriction Fragment Length Polymorphism (RFLP) analysis. After DNA isolation a PCR amplicon including the variant nucleotide was generated. Based on the variant nucleotide this amplicon can be cleaved into two parts or remain unaffected by a restriction enzyme. Subsequent electrophoresis allowed the discrimination of SNP alleles in the investigated sample. Comparison of the allelic variants revealed no significant differences in the distribution of this SNP between cases and controls (p=0,622). There was also no difference in SNP distribution between cases with/without HPV infection (p=0,558) or histologic variants (p=0.339). In order to strengthen the impact of our data we performed a combined analysis of all published data on this topic with our results. This ended up in SNP distribution data from 177 cases and 1149 controls. Overall, there were also no significant differences in the allelic distribution of the p53 codon 72 SNP between either cases and controls (p=0,914) or HPV-positive and HPV-negative cases (p=0,486). From this most comprehensive data available to date we conclude that there is no influence of the p53 codon 72 SNP on the risk of development of penile carcinoma in Caucasians even in the presence of HPV.

Keywords: penile cancer, HPV, squamous cell carcinoma, p53, polymorphism, RFLP

This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY-NC) license (https://creativecommons.org/licenses/by-nc/4.0/). See http://ivyspring.com/terms for full terms and conditions.
How to cite this article:
Stoehr R, Weisser R, Wendler O, Giedl J, Daifalla K, Gaisa NT, Richter G, Campean V, Burger M, Wullich B, Hartmann A. P53 Codon 72 Polymorphism and Risk for Squamous Cell Carcinoma of the Penis: A Caucasian Case-Control Study. J Cancer 2018; 9(22):4234-4241. doi:10.7150/jca.26050. Available from http://www.jcancer.org/v09p4234.htm