Multicenter analysis of serum tumor markers, treatment patterns, and relapse in patients with testicular cancer in clinical stage IS.

5052 Background: Testicular germ cell tumors (TGCT) in clinical stage I (CSI) are tumors confined to the testis without evidence of metastasis. Around 50% of all TGCT patients present with elevated serum tumor markers (TM) such as alpha-feto protein (AFP), beta-humanochoriongonadotropin (ß-HCG) and lactate-dehydrogenase (LDH). After ablatio testis, TMs usually return to normal according to half-life kinetics, however, in clinical stage IS (CSIS) TMs remain elevated or increase after surgery. Follow-up data on CSIS is scarce and our study aims to assess clinical characteristics and oncologic outcomes in a large TGCT cohort. Methods: In this multicenter study we collected data from 5 tertiar…