Hi Suzy
Your question is hard to answer until you get the path report from your latest tumor. If it is still TA low grade you should be fine.
Just ensure you continue to check-ups(Cystos every 3 months)
You seem to trust your Uro which is good. Have you ever thought of getting a 2nd opinion, due to the tumor recurrences and both BCG and MMC failing.
I wish you all the best,
Jack
PS: I thought you had CIS tumors in the past or am I confused on that?