# Mutational landscape of epidermoid carcinoma of the penis in a Brazilian cohort

## TL;DR

This study identifies common genetic mutations in penile cancer from Brazilian patients, revealing diverse molecular patterns and potential targets for treatment.

## Contribution

The study reports the mutational landscape of penile cancer in a Brazilian cohort, highlighting novel and frequently mutated genes like MUC16 and PABPC1.

## Key findings

- MUC16 and PABPC1 were the most frequently mutated genes in penile cancer tumor samples.
- The cohort showed significant genetic heterogeneity with mutations in carcinogenesis-related pathways.
- HPV-16 was detected in some cases but not consistently linked to more aggressive disease.

## Abstract

Penile cancer (PeCa) is a rare malignancy strongly associated with poor genital hygiene and is more prevalent in regions with low socioeconomic status. PeCa accounts for approximately 2% to 4% of all male cancers in Brazil, with higher incidence in the North and Northeast regions. Despite its aggressive nature, the molecular mechanisms underlying PeCa remain poorly understood. We performed whole-exome sequencing in a Brazilian cohort of patients with PeCa to identify potentially pathogenic genetic alterations associated with tumor development and progression.

Tumor tissue samples were obtained from patients diagnosed with PeCa. DNA was extracted and subjected to whole-exome sequencing. Human papillomavirus (HPV) genotyping was performed for subtypes 16 and 18. Control samples were collected from individuals without PeCa or other genital diseases.

The cohort demonstrated considerable genetic heterogeneity. Multiple gene mutations were identified in tumor samples, many of which are involved in carcinogenesis-related biological pathways. Distinct molecular profiles were observed, suggesting diverse tumorigenic mechanisms. MUC16 (present in 11/12 patients, 91.7%) and PABPC1 (8/12 patients, 66.7%) were the most frequently mutated genes. HPV-16 was detected in a subset of cases; however, no consistent association with more aggressive disease was identified.

This study provides new insights into the genomic landscape of PeCa in a Brazilian population. The findings highlight the presence of heterogeneous and potentially pathogenic mutations, reinforcing the need for further molecular characterization and exploration of novel therapeutic targets in PeCa.