Urinary bother, Urinalysis, and Two-Year Efficacy Follow-Up Results of Phase I trial of intravesical Bacillus Calmette-Guérin combined with intravenous pembrolizumab in recurrent or persistent high-grade non-muscle-invasive bladder cancer after previous Bacillus Calmette-Guérin treatment.

Abstract

Objective

To report urinary bother, urinalysis changes, disease-free survival (DFS), and overall survival (OS) over two years for subjects enrolled in a phase I dose-escalation trial (NCT02324582) of intravesical Bacillus Calmette-Guérin (BCG) in combination with systemic pembrolizumab for recurrent or persistent high-grade non-muscle invasive bladder cancer (HGNMIBC).

Methods

Eighteen patients consented to the study. Five were screen failures. Clinical activity was determined using cystoscopy and cytology with a biopsy of suspicious lesions. Urinalysis and International Prostate symptom score were assessed at pre-treatment, Week 10 (during combined BCG and pembrolizumab treatment), and 3 and 6 months from treatment completion. IPSS was analyzed using a mixed-model repeated measures analysis. A Chi-square test was used to compare urinalysis results at each interval.

Results

The pathologic disease stage after restaging transurethral resection and before treatment was pTa in 6 (46.2%), CIS in 6 (46.2%), and pT1 in 1 (7.7%). There was no increase in reported urinary bother throughout treatment. Quality of life measurements demonstrated no change in subjective burden. On urinalysis, we did not observe significant differences at 3 months compared to baseline evaluation. At 12 months, the DFS and OS were 69.23% and 92.31%, respectively. At 24 months, the DFS and OS were 38.46% and 92.31%, respectively.

Conclusions

Treatment with BCG combined with intravenous pembrolizumab is not showing increased urinary bother or adverse urinalysis changes. Two-year response data is promising and await confirmation in the phase III study (Keynote 676)

MicroAbstract

In this paper, we show, for the first time, that treatment with a combination of BCG and Pembrolizumab for high-grade non-muscle invasive bladder cancer poses no significant changes in urinary bother, patient quality of life, or urinalysis based on 2-year follow-up data of a cohort of patients enrolled in the Phase I dose escalation trial NCT02324582. A phase III trial has since opened to study further this combination's efficacy and safety (KEYNOTE-676). Our findings are a new addition to the literature in that they support an additional option in treatment for patients who cannot elect for curative surgical management without posing significant disruption to day-to-day life