Hi - Thanks for starting a forum about this important topic. Treatment decisions can be very personal, and are often stressful and confusing.
BCG is the "gold standard" for treating cancer cells that are in the lining of the bladder. Many people here have received BCG. Here's some more information about BCG: https://bladdercancer.net/treatment/bcg. I am also sharing a study about the success rates for BCG in patients with high risk non-muscle invasive bladder cancer: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5291702.
I'd encourage you to continue researching and ask your doctor any outstanding questions that you have (for example, what other treatment options are available to me?). I'd also encourage you to consider getting a second opinion from another doctor if you're still not feeling sure about it. You absolutely deserve to feel comfortable and confident about your treatment plan before moving forward.
Keep in mind that everyone's cancer responds differently to treatment, so the outcome for your friend's husband may not necessarily be reflective of all outcomes with BCG. I do hope other people with personal experiences using BCG will chime in with how it went for them!
Sending support,
-Sarah (BladderCancer.net Team Member)