A Study of NDV-01 as an Intravesical Administration to Patients With BCG-Unresponsive Non-Muscle Invasive Bladder Cancer (NMIBC), Refractory to First-line Therapy

Inclusion Criteria:

* BCG-unresponsive NMIBC with CIS of the bladder, with or without coexisting papillary Ta/T1 tumor(s) who are ineligible for or have elected not to undergo cystectomy at the time of enrollment and have experienced 1) CIS disease within 12 months of treatment.
* Participants with BCG-unresponsive disease must have received up to two first-line therapies or BCG-unresponsive disease and who are recommended for radical cystectomy. Such therapies may include agents approved or in development (e.g., pembrolizumab, nadofaragene firodenovec, nogapendekin alfa inbakicept-pmln, cretostimogene grenadenorepvec, detalimogene voraplasmid, TARA-002, gemcitabine intravesical system (INLEXZO®), gemcitabine, MMC, or valrubicin monotherapy. Participants will have demonstrated recurrence or intolerance after one or two first-line therapy(ies).
* All specimens must be predominantly urothelial (transitional cell) carcinoma with or without squamous or glandular differentiation. Pure squamous or glandular tumors will not be included. Participants with less than 10% micropapillary histology will be included. All other variant histology (e.g. plasmacytoid, small cell, nested, trophoblastic variants) will not be included.

Exclusion Criteria:

\- Has had urothelial carcinoma outside of the urinary bladder (i.e., urethra, ureter, or renal pelvis) or has a predominant histological variant of UC. Ta/any T1, CIS of the upper urinary tract is allowable if treated with complete nephroureterectomy more than 24 months prior to initiating study: Participant has tumor(s) involving the prostatic urethra (ductal or stromal); N+ and/or M+ per computerized tomography (CT)/Magnetic Resonance Imagery (MR) urography. History of prior T2/T3 urothelial carcinoma of the bladder.