1. Comparison and combination of mutation and methylation-based urine tests for bladder cancer detection
- Author
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Naheema S. Gordon, Elspeth K. McGuigan, Michaela Ondasova, Jennifer Knight, Laura A. Baxter, Sascha Ott, Robert K. Hastings, Maurice P. Zeegers, Nicholas D. James, K. K. Cheng, Anshita Goel, Minghao Yu, Roland Arnold, Richard T. Bryan, and Douglas G. Ward
- Subjects
Bladder cancer ,Urine test ,Biomarker ,Mutation ,Methylation ,Therapeutics. Pharmacology ,RM1-950 - Abstract
Abstract Background and aims Several non-invasive tests for detecting bladder cancer (BC) are commercially available and are based on detecting small panels of BC-associated mutations and/or methylation changes in urine DNA. However, it is not clear which type of biomarker is best, or if a combination of the two is needed. In this study we address this question by taking a 23-gene mutation panel (GALEAS™ Bladder, GB) and testing if adding a panel of methylation markers improves the sensitivity of BC detection. Methods Twenty-three methylation markers were assessed in urine DNA by bisulphite conversion, multiplex PCR, and next generation sequencing in 118 randomly selected haematuria patients with pre-existing GB data (56 BCs and 62 non-BCs), split into training and test sets. We also analysed an additional 16 GB false-negative urine DNAs. Results The methylation panel detected bladder cancer in haematuria patients with 69% sensitivity at 96% specificity (test set results, 95% CIs 52-87% and 80-99%, respectively). Corresponding sensitivity and specificity for GB were 92% and 89%. Methylation and mutation markers were highly concordant in urine, with all GB false-negative samples also negative for methylation markers. Conclusions and limitations Our data show that, with a comprehensive mutation panel, any gains from adding methylation markers are, at best, marginal. It is likely that low tumour content is the commonest cause of false-negative urine test results. Our study does have a limited sample size and other methylation markers might behave differently to the those studied here.
- Published
- 2024
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