Upper Urinary Tract Carcinoma

This is a randomized open-label multicentre Phase III superiority study of the effect of adding SBRT to the standard of care treatment on overall survival in patients with rare oligometastatic cancers. Patients will be randomized in a 1:1 ratio between current standard of care treatment vs. standard of care treatment + SBRT to all sites of known metastatic disease. The primary objective of this trial is to assess if the addition of stereotactic body radiotherapy (SBRT) to standard of care treatment improves overall survival (OS) as compared to standard of care treatment alone in patients with rare oligometastatic cancers.

The goal of this observational study is to evaluate the intravesical recurrence (IVR) rate after ureteroscopy (diagnostic or treatment) for upper tract urothelial carcinoma (UTUC) followed by an adjuvant single instillation of Mitomycin C (SI-MMC). The main question it aims to answer are: * What is the total and time to IVR after 2 years after ureteroscopy (diagnostic or treatment) for UTUC * How is the IVR compared with a historical cohort (no SI-MMC) * What is the time to IVR after 2 years in patients who subsequently received treatment by endoscopy vs. radical nephroureterectomy (RNU) * What is the additional value of a SI-MMC on time to IVR after RNU + adjuvant MMC in patients who were evaluated by ureteroscopy prior to RNU