Vgau..this from The Cleveland Clinic..2008..a really good article..many pages.......also for Sara Anne..they list CIS as 10%..
Index patient no. 3:This is a patient with multifocal and/or large-volume, histologically confirmed, low-grade Ta disease or a patient with recurrent low-grade Ta bladder cancer.
Recommendation: An induction course of intravesical therapy with BCG or mitomycin C is recommended with the goal being prevention or delay of recurrence. (The published guidelines reported a decreased probability of recurrence with either BCG or mitomycin C compared with tumor resection alone. Additionally, the report indicated no statistical advantage of either agent with respect to the incidence of tumor recurrence.)
Option: Maintenance BCG or mitomycin C may be considered. (The guidelines listed that, while maintenance BCG or mitomycin C is more effective in decreasing recurrence than induction alone, one must consider side effects, discomfort, lack of a uniform dosing schedule, and cost factors that may outweigh the benefits of this approach.
emedicine.medscape.com/article/458825-overview
Pat