CD34 immunoexpression in penile carcinoma

RESUMO

Objective: To investigate microvessel density as a risk factor in squamous cell carcinoma of the penis. Methods: Fifty patients with penile carcinoma were evaluated retrospectively. The mean age and standard deviation were 60.8 +/- 11.8 years. All of them were treated by penectomyand with positive nodes underwent groin lymphadenectomy. Tumor grading was 36 G1 and 24 G2/3. Primary lesion stage was 22pT1 and 28pT2-4. Positive inguinal nodes were observed in 18 patients. Selected paraffin embedded sections were submitted to CD34 immunohistochemical analysis by the avidinbiotin-immunoperoxidase method with antigen retrieval. All slides were examined using an automatic analyser system and the number of micro-vessels in 10 high magnification power fields (400X) were counted in a blind analysis. Results: Median number of microvessels was 631 in G1 versus 695 in G2/3 tumors (p=0.78), and 696 in pT1 versus 566 pT2-4 tumors (p=0.23). The respective data for pN0 patients was 525 and for pN+ was 696 (p=0.01), which is an unexpected result. Conclusion: CD34 immunoexpression or microvessel density determined by this method bear no association with tumor grade, stage or prognosis.