Study	Reason for exclusion
Doehn 2014	Irrelevant study design: this was a sequential intervention study where participants received WLC TURBT, blue light‐guided TURBT, and NBI + WLC TURBT in a randomized order.
Dogra 2016	Irrelevant outcome: this study compared the detection of bladder cancer, rather than our outcomes of interest (disease recurrence, progression, death, adverse events).
Geavlete 2012	Irrelevant study design: all participants underwent WLC TURBT, followed by NBI + WLC TURBT.
Hah 2018	Irrelevant outcome: this study compared the detection of bladder cancer, rather than our outcomes of interest (disease recurrence, progression, death, adverse events).
Herr 2015	Article was retracted.
Herr 2019	Irrelevant design: editorial.
Hirner 2016	Irrelevant study population: this study examined the use of NBI in participants on surveillance, a population which we have specified to exclude in our protocol since we are only considering the use of NBI in the treatment setting in this review.
Lee 2017	Irrelevant outcome: this study compared the detection of bladder cancer, rather than our outcomes of interest (disease recurrence, progression, death, adverse events).
Mita 2018	Irrelevant study population: this study examined the use of NBI in participants on surveillance, a population which we have specified to exclude in our protocol since we are only considering the use of NBI in the treatment setting in this review.
Mukherjee 2019	Irrelevant study design: this was a sequential intervention study where participants received WLC TURBT and NBI + WLC TURBT in a randomized order.
Naya 2015	Irrelevant study design: this was a sequential intervention study where participants received WLC TURBT and NBI + WLC TURBT in a randomized order.
Shen 2010	Irrelevant study design: this was a sequential intervention study where participants received WLC TURBT and NBI + WLC TURBT in a randomized order.
Shen 2012	Irrelevant study design: this was a sequential intervention study where participants received WLC TURBT and NBI + WLC TURBT in a randomized order.
Tschirdewahn 2020	Irrelevant study population: this study examined the use of NBI in participants on surveillance, a population which we have specified to exclude in our protocol since we are only considering the use of NBI in the treatment setting in this review.
Ye 2015	Irrelevant study design: this was a sequential intervention study where participants received WLC TURBT and NBI + WLC TURBT in a randomized order.

NBI: narrow band imaging; TURBT: transurethral resection of bladder tumor; WLC: white light cystoscopy