Prognostic Factors for Penile Cancer and Survival in Response to Multimodality Therapy

Purpose: To report treatment outcomes of penile cancer in a single institution in Thailand and to identify prognostic factors for survival, highlighting the crucial role of multi-modality treatment (MMT). Patients and Methods: Squamous cell carcinoma of penis patients who were treated at Srinagarind hospital between 2007-2015 were retrospectively analyzed. Clinical and pathological data were retrospectively reviewed. Overall survival (OS) was calculated using the Kaplan-Meier method and data were compared using the Log rank test. Cox regression analysis of factors affecting survival was conducted. Results: A total of 70 patients were identified with a median follow-up of 69.4 months. Twenty-eight patients (40%) presented with early-stage (stage I or II), whereas 42 patients (60%) were stage III or IV disease. The median OS was 29.3 months (Interquartile range 10.5 months - not reached) for the entire cohort. Nodal involvement was the only factor identified from the multivariate model with the adjusted HR or 5.74 (95% CI 2.52-13.04). For patients with stage IIIB/IV, multi-modality treatment (MMT) resulted in longer survival when compared with surgery alone (HR 0.37; 95% CI 0.16-0.90). Conclusion: Patients with penile cancer in Thailand presented with younger age and more locally advanced stage. Nodal involvement is the single poor prognostic factor for OS and MMT was associated with longer survival in stage IIIB/IV disease.