ΔNp63 expression is associated with poor survival in ovarian cancer

Background: P63 belongs to the 'p53 family' whose role in cancer progression has been recently revisited in light of the plethora of splicing variants that are generated. We analyzed the expression of the full-length TAp63 gene and its dominant-negative form Delta Np63 in ovarian cancer biopsies to correlate their expression with clinical outcome. Materials and methods: Real-time RT-PCR analysis was used to determine the levels of TAp63 and Delta Np63 in 83 stage I and in 86 stage III ovarian cancer biopsies and in seven human ovarian cancer cell. Results: TAp63 levels were comparable in stage I and stage III, but Delta Np63 levels increased 77-fold in stage III, independently of the p53 status. Patients with high Delta Np63 expression had the worst overall survival (OS); patients with a Delta Np63/TAp63 ratio > 2 had a poor OS. Patients with a high Delta Np63/TAp63 ratio were those with a poor response to platinum-based therapy. Conclusions: Data indicate a role for Delta Np63 as a potential biomarker to predict patient's outcome and tumor progression in ovarian cancer. This would have particularly clinical relevance in ovarian cancer where the high rate of mortality reflects our lack of knowledge of molecular mechanisms underlying cell progression toward malignancy.