Monitoring Treatment Response and Metastatic Relapse in Advanced Bladder Cancer by Liquid Biopsy Analysis

Of the patients undergoing radical cystectomy, 20-80% experience relapse. Minimally invasive methods for early detection of metastatic relapse after cystectomy and for monitoring ongoing therapy are urgently needed to improve individualised follow-up and treatment. Therefore, we evaluated the use of circulating tumour DNA (ctDNA) in plasma and urine to detect metastatic relapse after cystectomy and measure treatment efficacy. We exome sequenced tumour and germline DNA from patients with muscle-invasive bladder cancer and monitored ctDNA in 370 liquid biopsies throughout the disease courses by 84 personalised digital droplet polymerase chain reaction assays targeting 61 genes. Patients were prospectively recruited between 2013 and 2017. Patients with metastatic relapse had significantly higher ctDNA levels compared with disease-free patients (p<0.001). The median positive lead time between ctDNA detection in plasma and diagnosis of relapse was 101 d after cystectomy (range 0-932 d). Early detection of metastatic relapse and treatment response using liquid biopsies represents a novel, highly sensitive tool for monitoring patients, supporting clinicians, and guiding treatment decisions.

Measurement of tumour-specific mutations in plasma and urine may be a powerful tool to monitor response during treatment and identify early signs of metastatic disease.

European urology. 2017 Sep 25 [Epub ahead of print]

Karin Birkenkamp-Demtröder, Emil Christensen, Iver Nordentoft, Michael Knudsen, Ann Taber, Søren Høyer, Philippe Lamy, Mads Agerbæk, Jørgen Bjerggaard Jensen, Lars Dyrskjøt

Department of Molecular Medicine, Aarhus University Hospital, Aarhus, Denmark; Department of Clinical Medicine, Aarhus University, Aarhus, Denmark. Electronic address: ., Department of Molecular Medicine, Aarhus University Hospital, Aarhus, Denmark; Department of Clinical Medicine, Aarhus University, Aarhus, Denmark., Department of Molecular Medicine, Aarhus University Hospital, Aarhus, Denmark., Department of Pathology, Aarhus University Hospital, Aarhus, Denmark., Department of Oncology, Aarhus University Hospital, Aarhus, Denmark., Department of Clinical Medicine, Aarhus University, Aarhus, Denmark; Department of Urology, Aarhus University Hospital, Aarhus, Denmark., Department of Molecular Medicine, Aarhus University Hospital, Aarhus, Denmark; Department of Clinical Medicine, Aarhus University, Aarhus, Denmark. Electronic address: .

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