Well you've got a rare one and i don't know where you are located but will tell you the surgeon you pick is crucial to success. I can help you there.
Urachal cancer does not seem to respond to treatment for bladder cancer, but recently there seems to have been more success using chemotherapy regimes used for bowel cancer. Surgery is also used, sometimes with partial or full removal of the bladder, urachus and any cancerous lymphnodes. As this disease is so rare it is difficult to find any recent statistical information covering a large sample of patients, but there has definitely been progress in treatment and people with urachal cancer have been successfully treated .
Let me know where you are located so we can find you the best specialist.