Intravesical therapy with bacillus Calmette-Guérin has proven effects for reducing recurrence, progression, and death from non-muscle-invasive bladder cancer.
These advantages are seen mainly when appropriate maintenance therapy is used for 1-3 years, in the context of appropriate patient selection, tumor management, and symptom support for potential side effects.
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Reference: Eur Urol. 2014 Feb;65(2):267-9 Epub 2013 Oct 26