Heinz,
I have a slightly different take on this question. My answer is based on questions posed to my doc, and what I have observed since my own diagnosis. I believe that BC is totally a crap shoot.
I asked my Doc (whom I finally went searching for his doctor rating on the internet and found that he was a 1998 Duke graduate)...
"Is bladder cancer a bad cancer?"
And his reply was, "It's unpredictable. I've seen bladders be totally clean for over 2 years, NOTHING, and then suddenly it came back with a vengeance. "
The lady I know of who got a neobladder last year at UNC had been cancer free for 10 years and then, presto, it was back and covered the bladder.
But, I do agree with the rest of the group, if yours was low-grade to begin with, then your prognosis would be much more hopeful than someone initially diagnosed with high grade.
Vigilance is the only answer for us.
Best regards,
Rosemary