The association between BCG treatment in patients with bladder cancer and subsequent risk of developing Alzheimer and other dementia.-A Swedish nationwide cohort study from 1997 to 2019.

This study observed a marginally decreased risk of developing AD/dementia associated with earlier intravesical BCG treatment in NMIBC patients. This small benefit was most pronounced in those with high age and female gender. The disparity from previous highly positive studies underscores the importance of using an appropriate control cohort.