Impact of tumor size on the oncological outcome of high-grade nonmuscle invasive bladder cancer – examining the utility of classifying Ta bladder cancer based on size.

To examine survival rates and to calculate the risk of disease recurrence, progression, overall, and cancer-specific mortality in patients diagnosed with high-risk NMIBC using a multi-institutional dataset to evaluate differences between the guidelines of the European Association of Urology and the guidelines of the National Comprehensive Cancer Network (NCCN) with regard to tumor size in risk stratification.