A Trial to Evaluate Efficacy of Reinduction With Nadofaragene Firadenovec in Subjects With CIS ± High-grade Ta/T1 and no Complete Response to First Nadofaragene Firadenovec Dose.

Inclusion Criteria:

* Diagnosed, as documented, with CIS ± high-grade disease Ta/T1 and absence of progression after first dose of nadofaragene firadenovec within the last 5 months from instillation.
* Diagnosed, as documented, with:

  * Low risk of disease progression as assessed at the discretion of the investigator
  * Previous Bacillus Calmette Guerin (BCG) therapy (BCG exposed) with no maximum limit to the amount of BCG administered

Exclusion Criteria:

* Current or previous evidence of muscle-invasive (muscularis propria) or metastatic disease presented at the screening visit. Examples of increased risk of muscle-invasive include but are not limited to:

  * Presence of lymphovascular invasion and / or micropapillary disease as shown in the histology of the biopsy sample
  * Subjects with T1 disease accompanied by the presence of hydronephrosis secondary to the primary tumor
* Current and prior systemic or local therapy for bladder cancer since first dose of nadofaragene firadenovec
* Current or prior investigational treatment for BCG-unresponsive NMIBC or any other investigational drug (drug used in a clinical trial, i.e drug used in a Ferring sponsored non-interventional study does not apply) since first dose of nadofaragene firadenovec
* Clinically significant and unexplained elevated liver or renal function tests
* History of malignancy of other organ system within past 5 years, except treated basal cell carcinoma or squamous cell carcinoma of the skin and ≤pT2 upper tract urothelial carcinoma at least 24 months after nephroureterectomy. Also subjects with genitourinary cancers other than urothelial cancer or prostate cancer that are under active surveillance are excluded