Yes, a very good friend of mine was diagnosed with testicular cancer while in the Navy several years ago. He was castrated and received 100% disability from the Navy. 5 years later, with no reoccurring cancers, he was pronounced 'cured'.
I had it when I was about 23 or so. This was way back in the '70s so I'm pretty sure the treatment is more sophisticated today. I had like two weeks of antibiotics and then a biopsy. Bad outcome and it was removed. Two weeks later a lymphectomy to be sure it didn't spread. Cancer free since then. Good luck to him. Email me you want any of my ancient input....I think treatment has changed a bunch.