TAR-200 Monotherapy Has 82.8% Complete Response Rate in BCG-Unresponsive HR-NMIBC
Updated findings from SunRISe-1 also showed that all but 1 responder achieved complete response within 12 weeks of treatment with the targeted gemcitabine delivery system.
Updated
“Radical cystectomy is a life-changing operation with considerable morbidity and quality of life considerations,” said Joseph Jacob, MD, MS, presenting author and associate professor of urology at Upstate Medical University. “Moreover, there is a 90-day mortality risk of up to 8%. As such, there is a high unmet need for bladder-sparing therapies in this population.”
TAR-200 is a novel targeted release system that delivers gemcitabine to the bladder over time and is inserted using a urinary placement catheter, which typically takes 2 to 3 minutes. Removal of TAR-200 is conducted with a cystoscope, similar to removing a ureteral stent.
The new SunRISe-1 findings were presented at the
In these updated results—with a data cutoff of January 4, 2024—82.8% (95% CI, 70.6%-91.4%) of 85 patients treated with TAR-200 monotherapy achieved a complete response (CR) measured via urine cytology and/or biopsy. Additionally, 86.2% (95% CI, 74.6%-93.9%) of patients in this cohort achieved an investigator-assessed CR. Onset of CR was rapid, with 98% of responses achieved at week 12, when the first disease assessment was conducted.
"The high complete response rate and durability of these responses observed in patients treated with TAR-200 underscores the potential of this treatment approach for patients with BCG-unresponsive HR-NMIBC," Jacob said in a
The dosage in this study involved monotherapy once every 3 weeks for the first 24 weeks, and then once every 12 weeks until week 96. The estimated 6-month CR rate is 75.7% (95% CI, 59.1%-86.3%) and the estimated 12-month CR rate is 61.9% (95% CI, 41.1%-77.1%). Additionally, the estimated 1-year duration of response rate is 74.6% (95% CI, 49.8-88.4), with a median follow-up of 29.9 weeks (range, 14-140) in responders.
The CR rate of the TAR-200 monotherapy was fairly consistent across several patient subgroups, noting different proportions of each demographic.
When stratified by age, the CR rate was 85.7% for those younger than 65, 84.6% for those aged 65 to 74 years, and a slightly lower 77.8% for those aged 75 years and older. While the racial subgroups only included White and other—grouping together Black, Asian, and not reported or unknown—as categories, the CR rate was 87.2% for White patients and 73.7% for the rest. Additionally, female patients had a higher CR rate (92.3%) than male patients (80%), though there were much more men in the study than women, making up 80% of the cohort.
Among those in the cohort, the median age was 71 years (range 40-88) and 32.9% had concurrent papillary disease. Jacob noted during the presentation that 41 of 48 (85%) responses were still ongoing as of January 4, 2024, and that 4 of 5 patients who have received 2 years of the monotherapy remain in response. Additionally, none of the responders progressed to muscle invasive or metastatic disease, and only 1 responder underwent radical cystectomy.
Treatment-related adverse events (TRAEs) were observed in 61 (71.8%) patients, with the most frequent being pollakiuria (35.3%), dysuria (29.4%), micturition urgency (15.3%), and urinary tract infections (15.3%). Eight (8.2%) patients experienced grade 3 or higher TRAEs, and 4 (4.7%) encountered 1 or more serious TRAEs, leading to discontinuation in these 4 cases. No deaths were reported.
SunRISe-1 has a total of 4 cohorts. While this session focused primarily on patients in cohort 2 who received the TAR-200 monotherapy, the other cohorts include patients receiving TAR-200 in combination with cetrelimab (cohort 1) and patients receiving cetrelimab alone (cohort 3). Cohort 4 was later added to include patients with BCG-unresponsive papillary-only HR-NMIBC receiving TAR-200 monotherapy.
References
- Necchi A, Daneshmand S, Simone G, et al. TAR-200 in patients with Bacillus Calmette–Guérin-unresponsive high-risk non–muscle-invasive bladder cancer: results from SunRISe-1 study. J Urol. Published online May 1, 2024. doi:10.1097/01.JU.0001015816.87470.c9.01
- TAR-200 intravesical delivery system results show 77 percent complete response rate in patients with Bacillus-Calmette-Guérin unresponsive, high-risk non-muscle-invasive bladder cancer. News release. Johnson & Johnson. October 22, 2023. Accessed May 3, 2024. https://www.jnj.com/media-center/press-releases/tar-200-intravesical-delivery-system-results-show-77-percent-complete-response-rate-in-patients-with-bacillus-calmette-guerin-unresponsive-high-risk-non-muscle-invasive-bladder-cancer
- TAR-200 monotherapy shows greater than 80% complete response rate in patients with high-risk non-muscle-invasive bladder cancer. News release. Johnson & Johnson. May 3, 2024. Accessed May 3, 2024. https://www.prnewswire.com/news-releases/tar-200-monotherapy-shows-greater-than-80-complete-response-rate-in-patients-with-high-risk-nonmuscle-invasive-bladder-cancer-302135628.html
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