because the disease is:
a) so diffuse
b) difficult to visualize .
Intravesical BCG instillations required.
Patients with CIS are at significant risk of cancer progression..
Cystectomy does not appear to offer a survival advantage.
BCG Results:
70% of patients have an initial response to BCG .
75% of patients who initially have a complete response remain disease free for 5 years.
At 10 years