Bacillus Calmette-Guérin (BCG) is a puny cousin of the bacteria that causes tuberculosis, and as such serves as an excellent vaccine against the disease. But BCG is also used to treat bladder cancer.

Bacille Calmette-Guérin (BCG), an attenuated strain of Mycobacterium bovis, is widely administered as a vaccine for tuberculosis. BCG is also used as a biotherapy for superficial bladder carcinoma.

and Rita mentioned that the BCG vaccine was being used in bladder cancer patients." Martínez-López remembered getting the BCG ...

BCG was developed as far back as 1921, and it's also used to fight tuberculosis. But cancer doctors realized that BCG could set up an immune response in the bladder that drew immune cells to the ...