BREAST CANCER

Bladder cancer starts when cells in the urinary bladder begin to grow uncontrollably. The majority of bladder cancers begin in the innermost lining of the bladder. As the cancer spreads to other layers of the bladder wall, it advances and can be harder to treat.1

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Reference: 

1. What is bladder cancer? American Cancer Society website. https://www.cancer.org/cancer/bladder-cancer/about/what-is-bladder-cancer.html. Accessed October 25, 2018