Shinseung Kim

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2. Materials and Methods 2.1. Study Population and Data Collection All patients who underwent TURBT from January 2017 to December 2020 were selected. Bladder tumours were staged according to the 2017 TNM classification of urinary bladder cancer [15]. Histologic grading of bladder tumours was performed according to the 2004/2016 World Health Organisation (WHO) grading classification system [16]. After confirmation by pathologic examination, patients diagnosed with NMIBC were enrolled in the study.