I, too, had what the doc called a false positive FISH in January of this year. The positive pathology report came from Cleveland Clinic. So in March, my doc (not a Cleve. Clinic doc) did a cysto stating the positive FISH and gross hemturia. No malignancy was found in the bladder, only chronic inflammation and hemorrhage. No positive cysto since, either!
I am scheduled for another FISH next month, only this time doc doesn't want Cleve. Clinic lab, he prefers the Quest Laboratories. I am surprised - thought Cleve. Clinic should be really good.
"You can't smooth out the surf, but you can learn to ride the waves."
Got the biopsy results on 12/18 from the 12/11 TURB: no cancer from the five tissue samples, just "atypical cells" which the urologist says is better than "dysplasia" which I had a year ago. That's good news since I am completely intolerant of BCG and MMC, therefore the doc has said if cancer returns he will move toward radical cystectomy.
Have another pathologist look at the FISH tests. Responses can vary from one to another.
And i do know of one person on this forum who had CIS which was not discovered until after cystoscopy..it was hidden between the inner layer and muscle layer.
Not want to frighten you..but do have someone else read the tests and maybe get a fresh perspective.