5-time Olympic champion swimmer, Cal graduate, Nathan Adrian battling cancer

OAKLAND, Calif. (KGO) -- Five-time Olympic champion swimmer Nathan Adrian has announced he's battling testicular cancer.

The 30-year-old Cal graduate says he is optimistic about his diagnosis and getting right back in the pool.

Adrian says thanks to early detection his future is bright, telling his fans he plans to continue training for the 2020 Tokyo Games.