MANAGEMENT OF ADVANCED SQUAMOUS CELL CARCINOMA OF THE PENIS

15 Years of penile cancer management in the United States: An analysis of the use of partial penectomy for localized disease and chemotherapy in the metastatic setting

BACKGROUND

Penile cancer remains a rare disease in the United States, and its understanding may be limited by the uncommon nature of the malignancy. We sought to describe recent penile cancer treatment patterns using the National Cancer Data Base.

METHODS

A retrospective review of data obtained from the National Cancer Data Base from 1998 to 2012 was performed. We obtained demographic information and therapeutic approaches within the following2 clinical scenarios: performance of partial penectomy for early stage disease (clinical Ta-T2) and the use of chemotherapy for metastatic disease. Multivariate logistic analysis was performed.

RESULTS

A total of 2,677 patients presented with early stage penile carcinoma. The proportion receiving partial penectomy increased from 74% in 1998 to 2000 to 80% in 2010 to 2012 (P<0.001). Partial penectomy was more common in the elderly (age>80, odd ratios [OR] = 1.53, 95% CI: 1.05-2.23), young (age<50, OR = 1.46, 95% CI: 1.02-2.07), and in African Americans (OR = 1.45, 95% CI: 1.00-2.12). Increasing tumor size was significantly associated with decreased likelihood of receiving partial penectomy. Of those presenting with metastatic disease (n = 819), use of chemotherapy increased over the time period from 39% receiving chemotherapy in 1998 to 2000 to 49% in 2010 to 2012 (P<0.03). Patients least likely to receive chemotherapy were older and with higher Comorbidity score (both P<0.05), African American (OR = 0.46, 95% CI: 0.30-0.73), and living≥50 miles from the nearest treatment hospital (OR = 0.37, 95% CI: 0.25-0.55).

CONCLUSIONS

Penile-sparing surgery for early stage disease and the use of chemotherapy for metastatic disease are becoming more commonly utilized over the past several years. Further work is needed to define clinical and nonclinical factors associated with the treatment.

Penile carcinoma: a challenge for the developing world

Although rare in developed countries, carcinoma of the penis is an important problem in the developing world. Circumcision done in childhood offers the greatest protection against this disease. Poor penile hygiene and phimosis are strong risk factors for development of penile carcinoma. Early disease can be treated by conventional resection of the penis, or in selected patients by organ preserving techniques including Mohs micrographic surgery, and laser and radiation therapy. For more advanced primary disease, partial or total penectomy is needed. Elective or therapeutic lymph-node dissection is recommended for inguinal metastatic disease, and depending on the disease status, unilateral or bilateral inguinal or ilioinguinal lymphadenectomy might be needed. The role of chemotherapy, as adjuvant or primary treatment in metastatic disease, needs to be defined in prospective clinical trials, which can be done in developing countries.

Current issues in the management of advanced squamous cell carcinoma of the penis

Effective treatment of penile carcinoma incorporates three modalities: surgery, radiation and chemotherapy. Surgery alone may offer a high cure rate in early stages of the disease. In certain patients radiation therapy may be utilized to eradicate the tumor and allow organ preservation. For patients with locally advanced disease, multi-modality approaches incorporating adjuvant or neoadjuvant chemotherapy and radiation therapy need to be studied. This approach may confer a survival benefit to a group that would otherwise have a poor prognosis. Finally, in the setting of metastatic disease, less toxic and more effective combination chemotherapy are sought. Novel targeted therapies that have been successful in squamous cell carcinoma at other sites must also be studied in this disease. We believe that multi-institutional trials should be designed in order to obtain prospective benchmark data from which to make valid comparisons of outcome.