Longitudinal Bladder Cancer Study for Tumour Recurrence

Overview

Surveillance for recurrence of urothelial carcinoma (UC) requires frequent cystoscopy, which is invasive, expensive and time-consuming. An accurate urinary biomarker has the potential to reduce the number of cystoscopies required during post-treatment surveillance. This is a prospective, single arm, multi-center study using the diagnostic CxBladder test with subjects previously diagnosed with primary or recurrent UC and who are undergoing a schedule of investigative cystoscopies and treatment for the possible recurrence of UC presenting to qualified sites. To evaluate the performance characteristics of the CxBladder test, multiple consecutive urine samples will be collected during the course of surveillance.

This is a multi-site study recruiting subjects from Veterans Affairs and other medical centers. Subjects will be prospectively recruited to an observational study to validate the performance characteristics of CxBladder Monitor test (Monitor) and the second-generation test, CxBladder Monitor Plus (Monitor+). The study will recruit low, intermediate, and high-risk surveillance subjects, defined as per American Urological Association (AUA) / Society of Urologic Oncology (SUO) guidelines 2016 amendment 2020, previously diagnosed with urothelial carcinoma (UC). Eligible subjects will include those under surveillance for recurrence of UC. A voided urine sample will be collected from each enrolled subject at each of 4 successive surveillance visits. The collected urine will be used for CxBladder testing and central urine cytology. The study will collect primary tumour tissue from the first confirmed tumour, i.e., the primary diagnosis of UC (if available) and any subsequent collections within 12 weeks. Tissue samples from any UC recurrences while in study will also be collected to genotype each tumour using RNA or DNA markers indicative of an elevated risk of UC. Monitor/Monitor+ results will not be reported to patients or physicians. This study primarily aims to clinically validate the performance characteristics (sensitivity, specificity, negative predictive value, positive predictive value, and test-negative rate) of the Cxbladder Monitor/Monitor+ test compared to the reference standard i.e., tumours observed by cystoscopy and confirmed by pathology over a maximum of 4 surveillance visits. Sites are required to be competent in recruiting and completing required test request forms, Case Report Forms (CRF) and sample collection in a professional manner in accordance with good clinical practice (GCP).