Supplementary Material for: Prevention of Recurrent Bladder Tumors after Nephroureterectomy for Primary Upper Urinary Tract Urothelial Carcinoma: An Individualized Selection Strategy Based on Patient Risk Stratification Is Needed

<i>Objective:</i> To evaluate the efficacies of different chemotherapy regimens in different risk sub-groups for the prevention of bladder recurrence after radical nephroureterectomy (RNU). <i>Materials and Methods:</i> Between 2004 and 2012, we recruited 685 patients who underwent RNU for upper tract urothelial carcinoma at 4 Chinese institutions. We assessed whether the type of intravesical chemotherapy regimen affected the bladder recurrence rate in patients with different risk levels after RNU. <i>Results:</i> For all patients, the bladder recurrence rate was lower with intravesical chemotherapy than without, but no significant differences were found between the 2 intravesical chemotherapy regimens (single dose or relatively long-term therapy). We used multivariate analysis to define the risk factors for bladder recurrence and stratified patients into low-, intermediate-, and high-risk sub-groups accordingly. The bladder recurrence rate in the low-risk patients was not significantly different between patients with or without intravesical chemotherapy. However, in the intermediate-risk and high-risk patients, the rate was greater in patients without intravesical chemotherapy than in patients with. Furthermore, the rate was not significantly different between the 2 intravesical chemotherapy regimens in the intermediate-risk patients, while the efficacy of the relatively long-term regimen in high-risk patients remains unclear. <i>Conclusions:</i> Our study showed that an individualized strategy based on patient risk stratification is needed.