Ozark,
The only mention of BCG and 12 year consideration comes from Dr. Donald Lamm, who's SWOG protocol calls for a final maintenance round at 12 years:
"Maintenance is given weekly for 3 weeks at 3, 6, 12, 18, 24, and 36 months. I have omitted the 30 month treatment, but in high risk patients continue at 4, 5, 6, 8, 10 and 12 years to reduce the risk of late disease recurrence and progression. We recommend 1/3 dose BCG during maintenance and I would recommend further reducing to 1/10, 1/30, and 1/100th dose in 50cc in any patient with increased side effects. The benefit of BCG is gone 10 years after the last treatment."
Source:
bcgoncology.blogspot.com/
The final sentence may help decide on continuation of maintenance. See what your doctor thinks, and let us know. Many of us would like to be 12 years post initial treatment. Congratulations!
Best,
Jack