Characterization of relapse in patients with clinical stage I (CSI) nonseminoma (NS-TC) managed with active surveillance (AS): A large multicenter study.
4503 Background: Large single institution trials have demonstrated that AS for patients with CSI NS-TC is safe and effective. Information on timing and extent of relapse following AS has the potential to guide intensity and duration of imaging on AS. Methods: Retrospective clinical data on CSI patients were obtained from existing large databases, including institutions/regions which have a standardized policy of centralized management of testicular cancer including AS for patients with CSI NS-TC. In all, 1,034 patients with CSI NS-TC managed with AS were reviewed of whom 886 had no lymphovascular invasion (LVI-), 220 had lymphovascular invasion (LVI+) and 28 had unknown lymphovascular status (LVI unknown). Results: A total of 221 relapses occurred with 150/886 (17%) of LVI– pts , 60/120 (50%) LVI+ pts and 11/28 (39%) of LVI unknown pts (Table). Median follow-up was 63 months (1-163 months). At last follow up 1,013/1,034 (98%) were alive without disease, 16/1,034 (1.5%) were dead of other causes and 7/1,035 (0.05%) were alive with disease or dead of disease. Relapse was identified by marker elevation and/or abdominal imaging in almost all patients. Few patients relapsed with IGCCCC intermediate (18/221, 8%) or poor risk disease (3/221, 1.4%). Conclusions: AS for CSI NS-TC is safe and effective, using a policy of centralized management with loco-regional delivery of care. Our multinational outcomes compare well to single institutional reports. Relapse other than with IGCCC good risk disease was uncommon and death from disease was rare. Compared to patients with LVI-, relapses in LVI + CSI patients occur earlier and few relapses are detected past the first year of follow-up. This data may help in the design of follow up schedules tailored towards the relapse risk in CSI NS-TC AS. [Table: see text]