The usual treatment after surgery for early-onset bladder cancer is intravesical immunotherapy with Bacillus Calmette-Guerin bacteria. A solution containing the bacteria is inserted into the bladder with a catheter and held for a period of time, one hour in my case, and then expelled. The bacteria triggers an immune response and the leukocytes are fooled into destroying the cancer cells along with the bacteria. 

I truly hope all goes well for you,  best wishes. Gary