To develop a modified risk stratification scheme for localized prostate cancer incorporating percent of positive cores (PPC).
Surveillance, Epidemiology and End Results database was accessed for eligible patients. Assessment of the prognostic value of PPC was conducted in a multivariate Cox regression model. A modified risk stratification scheme was proposed.
In a multivariate model, higher PPC was associated with worse cancer-specific survival (p < 0.0001). A modified risk-stratification scheme was proposed incorporating PPC. Concordance index was evaluated and the results were: D'Amico model: 0.782 (SE: 0.014; 95% CI: 0.755-0.810); modified model: 0.809 (SE: <0.001; 95% CI: 0.781-0.837).
Integration of PPC into the risk stratification model for localized prostate cancer improves its performance.
Future oncology (London, England). 2018 May 10 [Epub ahead of print]
Clinical Oncology Department, Faculty of Medicine, Ain Shams University, Lotfy El Sayed Street, Cairo, 11566, Egypt.