Der Stellenwert der Tageted-Therapie beim Peniskarzinom

Molecular carcinogenesis in equine penile cancer: A potential animal model for human penile cancer

OBJECTIVES

To evaluate the expression of COX-2, E-cadherin, vimentin, 14-3-3σ, and Phosphatase and tensin homolog (PTEN) tumor-related proteins in equine penile papillomas (ePP) and squamous cell carcinomas (ePSCC), the occurrence of epithelial-mesenchymal transition (EMT) at the invasion front (IF) and compare our findings with current knowledge on human penile squamous cell carcinoma (hPSCC).

MATERIAL AND METHODS

We analyzed, by immunohistochemistry in 45 equine penile proliferative epithelial lesions, the expression of COX-2, E-cadherin, vimentin, 14-3-3σ, and PTEN using monoclonal antibodies. Tumors were histopathologically classified as well-differentiated or poorly differentiated using the IF grading scheme. Semiquantitative analysis was performed to determine down or up-regulation of the proteins and association with histopathological characteristics were statistically investigated using Mann-Whitney U test and/or Spearman's tests.

RESULTS

COX-2 was neo-expressed in 86.6% of the cases and expression progressively increased from ePP to ePSCC (P = 0.0003) and from well to poorly differentiated (P = 0.033). High COX-2 expression was associated with a high mitotic index (MI) (P = 0.026). In contrast to normal epidermis, ePSCC had very low E-cadherin expression in 64% of the cases (P = 0.0005). Vimentin was neo-expressed in 65% of poorly differentiated ePSCC at the IF indicating EMT. Cytoplasmic 14-3-3σ protein expression was reduced in 42% of the ePSCC and additionally, nuclear expression of 14-3-3σ in neoplastic keratinocytes and in the cytoplasm of stromal fibroblasts at the IF was features only found in ePSCC. PTEN protein showed a tendency to be decreased or lost in ePSCC.

CONCLUSIONS

Our study provides evidence of molecular abnormalities in ePSCC similar to those reported for human PSCC. The occurrence of EMT at the IF is a common event in ePSCC. Naturally occurring ePSCC could serve as a valuable preclinical animal model to explore upcoming therapeutic options for hPSCC.

Advances in penile cancer management

PURPOSE OF REVIEW

Penile cancer is a rare disease that may cause devastating physical and psychological effects on patients due to the disease itself and/or the associated treatments. As with many other cancer types, significant efforts have been made in penile cancer to minimize invasiveness and morbidity of therapeutic approaches, while aiming to conserve organ function and optimize disease control. This updated review focuses on penile cancer management data published in the last few years.

RECENT FINDINGS

Several aspects of penile cancer management are discussed in this review. Wider knowledge about the disease's natural history has provided the basis for new TNM staging and follow-up schedule proposals. Modern imaging techniques and gene profiling assays have been applied. A new guideline addressing various aspects of penile cancer was recently published, and more extensive experience has been gained with sentinel lymph node biopsy and radiotherapy. Quality of life and psychosexual impact of the disease are also being addressed.

SUMMARY

New diagnostic and therapeutic techniques, as well as attempts to better identify patients who may benefit from less invasive treatments have been studied, but more experience in the field is clearly needed. For this purpose, collaborative multicenter studies are strongly encouraged.

[The current state of the art of chemotherapy of penile cancer: results of a nationwide survey of German clinics]

INTRODUCTION

The prognosis for advanced penile carcinomas is extremely poor. Due to the low response rates and relevant side effects of current chemotherapy regimens, several attempts have been made to improve chemotherapy in recent years. In a retrospective survey the current state of the art of chemotherapy for penile carcinoma in Germany was analysed.

METHODS

The study took the form of a retrospective survey among all urological departments in Germany. The questionnaire contained seven questions concerning indications and modalities for chemotherapy of penile carcinoma in addition to general questions.

RESULTS

Out of 280 departments 129 (46%) returned an answered questionnaire. Chemotherapy was reported to be carried out by 91 of the answering departments and overall 18 different chemotherapy regimens were used. The regimens cisplatin/methotrexate/bleomycin, vinblastin/methotrexate/bleomycin and cisplatin/5FU were the most frequently reported. Chemotherapy was carried out on average 2.3 times per year per department. The majority of the departments reported response rates under 30%. Finally 101 of the answering departments confirmed the necessity of new chemotherapy regimens.

CONCLUSIONS

The current state of the art for chemotherapy of penile carcinoma showed a very large variation in Germany. The response rates were disappointing. A nationwide study with new chemotherapy approaches is urgently needed (information under www.uni-rostock.de/peniskarzinom).