SAINT PREX, SWITZERLAND -- Ferring Pharmaceuticals presented the first results from an ongoing Phase 3 trial in Japan assessing the efficacy and safety of nadofaragene firadenovec in patients with high-risk Bacillus Calmette-Guérin (BCG)-unresponsive non-muscle invasive bladder cancer (NMIBC) with carcinoma in situ (CIS) with or without papillary tumors (±Ta/T1).[1] Nadofaragene firadenovec is the first and only intravesical non-replicating gene therapy approved by the U.S. Food and Drug Administration (FDA) in this patient population.[2] The product is given once every three months.

The data - presented at the 112th Annual Meeting of the Japanese Urological Association (JUA 2025) held April 17-19 in Fukuoka, Japan - showed a complete response (CR) rate at three months of 75% (15/20) among Japanese patients with CIS ± high-grade Ta/T1.[1] Importantly, these results were achieved following a single quarterly administration, representing a significant clinical advantage. The efficacy appears higher than previously reported in the US Phase 3 trial[3,4] and adds to a growing body of evidence. Recent real-world data was presented by the Mayo Clinic and showed 79% CR rate,[2] demonstrating consistent efficacy and safety when patients are treated with nadofaragene firadenovec. Patients who responded at the three-month assessment received continued every three months doses until disease recurrence. These data will be presented at a future congress. Within this conservatively designed protocol, a replication of CS-003 US Phase 3 trial, patients who did not respond at three months were not offered a re-induction dose. This contrasts with a growing trend in other NMIBC trials, where re-induction is included in the study protocols for patients who do not achieve a response at initial assessment. Re-induction is now being explored with nadofaragene firadenovec in other trials.

“When BCG therapy is ineffective, patients are forced to choose invasive surgery, i.e., total bladder removal, but nadofaragene firadenovec may provide a new treatment option,” noted Professor Keiji Inoue, M.D., Ph.D., Department of Urology, Kochi Medical School. “These findings are particularly significant for Japanese patients, as our treatment options have been more limited compared to other regions. The ability to achieve such promising results represents an important advancement for our clinical practice.”

Overall, 80% of participants (16 patients) experienced drug-related adverse events (AEs), with 76 total AEs recorded. All reported AEs were either Grade 1 (64 AEs in 15 participants, 84.2%) or Grade 2 (12 AEs in 5 participants, 15.8%). No Grade 3, 4, or 5 AEs were reported, demonstrating a clinically manageable and tolerable safety profile. The data from Japan add to the growing body of evidence, including recent real-world data presented by the Mayo Clinic,[2] demonstrating favorable efficacy and safety when patients are treated with nadofaragene firadenovec.

“At Ferring, we are committed to meeting the unmet needs in bladder cancer care and equipping uro-oncologists with critical evidence they need to deliver effective, and life-changing treatment,” said Joern Jakobsen, M.D., Ph.D., Vice President and Head of Global Research and Medical for Uro-Oncology and Urology, Ferring Pharmaceuticals. “These new Phase 3 findings affirm the safety profile of nadofaragene firadenovec, demonstrating a three-month efficacy that is higher than previously reported in our Phase 3 clinical trial, and complements results from an ongoing independent real-world study presented earlier this year. Collectively, the data are broadening our understanding of the value that nadofaragene firadenovec offers, furthering our journey to establish nadofaragene firadenovec as the new standard of care and backbone therapy across the urothelial cancer disease spectrum.”

Bladder cancer is the 9th most common cancer worldwide by incidence, with approximately 614,000 new cases diagnosed each year.[5] Non-muscle invasive bladder cancer (NMIBC) accounts for about 75% of all newly diagnosed bladder cancers.[6] For patients who do not respond to BCG treatment, current options are limited, often leading to invasive surgery involving complete bladder removal. The strong efficacy demonstrated in this Japanese patient population suggests nadofaragene firadenovec could address a critical unmet need in the bladder cancer treatment landscape, delaying radical cystectomy and preserving quality of life for thousands of patients annually.

The ongoing Phase 3 Japanese trial is evaluating the efficacy and safety of nadofaragene firadenovec in two cohorts of high-risk BCG-unresponsive NMIBC patients: those with CIS ± HG Ta/T1, and patients with papillary tumors (Ta/T1) only. Results from the cohort with CIS ± HG Ta/T1 were presented on April 19 at JUA 2025.[1]