Abstract
4535 Background: A prognostic model for stage I seminoma managed by orchiectomy alone has limited predictive value since the high risk group has only a 30% relapse rate. Although the model has not been validated in an independent data set, it has been applied widely in treatment policies. We tested the value of the model in a consecutive series of patients managed by surveillance in the past decade. Methods: Individual data on 687 stage I seminoma patients managed by surveillance between 1998 and 2005 at the Copenhagen National Hospital, Princess Margaret Hospital and British Columbia Cancer Agency was retrospectively analyzed. Impact of age at diagnosis, original pathology [tumor size, histologic subtype, rete testis invasion, epidydimis, extratesticular soft tissue, spermatic cord, tunica albuginea, and small vessel invasion (SVI)] were analyzed for prognostic importance for relapse. The analysis was limited by missing data in significant proportion of reports [rete testis (33%), SVI (25%), tumor size 2...
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