In general, 70% of men diagnosed with Stage I Nonseminoma and 80% of men diagnosed with Stage I Seminoma are cured by the orchiectomy alone.

 

If you choose surveillance and you stick to the surveillance protocol, then regardless of whether you have Stage I Seminoma or Nonseminoma, your odds of being cured are the same as someone who chose to have radiation or an RPLND.

source: tcrc.org