Hi Mary. So sorry to hear that the tumors keep coming back. This is, however, a nasty secret about bladder cancer. It DOES tend to return.
BCG is a totally different substance than Mitomycin, but no one known how any individual may react to it.
I do have another suggestion for you. Please remember that we are not doctors, just patients and caregivers who have "been around the block before." However, if the cancer keeps returning, that should be a real warning sign to you. In your place, I would get a second opinion at a center that sees a LOT of bladder cancer cases. BCG may be the best option, but it may not be. On our Home page there is a link to the Treatment Center Finder
bladdercancersupport.org/bladder-cancer-help/resources/treatment-center-finder
or let us know where you are located and maybe someone will have a good suggestion for you. You really do NOT want to continue having this return.
Sara Anne