A Phase II Study of Consolidative Local Therapy in Patients With Locally Advanced or Oligo-metastatic Urothelial Carcinoma (la/mUC) Following Treatment Response to Systemic Therapy With or Without Metastasis-directed Radiotherapy

This is a single-arm, open-label, phase 2 clinical trial designed to evaluate the impact of consolidative local therapy in participants with locally advanced/oligo-metastatic urothelial carcinoma (UC) who have demonstrated stable or responsive disease to first-line systemic therapy.

Inclusion Criteria:

1. Be at least 18 years of age.
2. Have provided informed consent.
3. Have ECOG Performance status of 0 or 1.
4. Be surgical candidate for extirpative surgery of primary site with standard bilateral pelvic lymph node dissection and urinary diversion at the discretion of urological oncologist.
5. If applicable, must be a surgical candidate for resection of non-irradiated metastatic lesion(s) at the discretion of the treating surgeon.
6. Have adequate organ function as defined by:
   1. Hgb >9.0 ng/dL.
   2. WBC >3.0 K/mcL.
   3. PLT >100 K /mcL.
   4. CrCl >30ml/min by Cockcroft-Gault Formula).
   5. AST <3.0 x ULN U/L.
   6. ALT <3.0 x ULN U/L.
   7. Total Bilirubin <2.0 x UNL mg/dL.
   8. INR <1.5 x ULN.

   Disease characteristics:

7. Have histologically confirmed diagnosis of locally advanced or oligo-metastatic urothelial carcinoma defined by presence of five or few distinct metastatic lesions at the time of diagnosis of metastatic disease.
8. If variant histology present, it must be <50% and UC must be predominant.
9. Must have begun the first cycle of enfortumab-vedotin-based first-line therapy at least three months prior to the surgery and have continued therapy and the treatment duration must have not exceeded six months from the start of the first cycle. Treatment interruption, modification and discontinuation due to adverse events are allowed. Metastasis-directed radiotherapy (MDRT) is allowed.
10. The most recent restaging scan prior to signing ICD must show stable disease, partial response or complete response per treating investigator-assessed RECIST v1.1. In case of stable disease or partial response, MDRT is highly recommended. Enrollment of such participants should be discussed with the PI.

Exclusion Criteria:

Participants who meet any of the following criteria will be excluded from study entry.

1. Received systemic anti-cancer therapy within three weeks prior to the surgery.
2. Received radiotherapy within two weeks prior to the surgery.
3. Have a positive serum pregnancy test or women who are breastfeeding.
4. Have other concurrent medical, surgical or psychiatric conditions that, in the treating investigator's opinion, may be likely to confound study interpretation or prevent completion of study procedures and follow-up examinations.
5. Have any medical condition that, in the treating investigator's opinion, poses an undue risk to the participant's participation in the study.
6. Have history of central nervous system (CNS) metastasis and/or leptomeningeal metastasis.

Ages Eligible for Study 18 Years and older (Adult, Older Adult )Sexes Eligible for Study AllAccepts Healthy Volunteers Yes