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3%) had IVR after 40 months (range, 24-56 months) follow-up. In the matched group, the independent risk factors for IVR were tumor diameter (HR = 2.690, p = 0.038) and tumor stage (T3 vs. T1, HR = 3.363, p = 0.019; T2 vs. T1, HR = 2.835, p = 0.022). OS and CSS were poor in patients with IVR than patients without IVR (p less then 0.0001). CONCLUSIONS In this propensity score-matched case-control study, tumor diameter and tumor stage were shown to be independent risk factors for IVR in patients with organ-confined UTUC. Moreover