Once the tumor has invaded the MUSCLE, a radical cystectomy is the way to go. The issue here is that the lamina propria is not the muscle, but a membrane between the bladder lining and the muscle. There is still a chance that the issue can end here with BCG treatment. But, as Jack mentioned, the risk is a bit higher than if the !#%@! tumor had remained in the lining.
BCG is the standard of care for non-invasive high grade bladder cancer, including and especially CIS. Your husband is being seen at one of the premier places for diagnosis and treatment of bladder cancer, so their advice should be "right on.:
As for what to expect from BCG, there are many many forum posts on the subject...go to the top of this page and click on the SEARCH box.
Jack also recently provided a link to another good article on BCG:
"Consensus statement on best practice management regarding the use of intravesical immunotherapy with BCG for bladder cancer.
2015 article from Nature Reviews Urology.
Among the panel are Dr Lamm and Dr O'Donnell, among other recognized names.
Of major interest is a comparison of BCG maintenance schedules and outcomes. THIS IS GOOD STUFF.
Table I shows in graphic format the comparison, but don't miss the text."
www.nature.com/nrurol/journal/v12/n4/full/nrurol.2015.58.html
Wishing you all the best
Sara Anne