What is bladder cancer?
Bladder cancer is cancer that begins in the bladder. The bladder is a hollow organ in the pelvis that stores urine before it leaves the body.
The bladder wall is made of several layers. Most bladder cancers begin in a layer called the urothelium, which lines the inside of the ureter, bladder, urethra and parts of the kidneys. Cancer may also develop in other types of cells in the bladder.
Bladder cancer incidence
Approximately 74,000 new cases of bladder cancer will be diagnosed in the United States in 2015, and an estimated 16,000 deaths will be due to bladder cancer, according to the American Cancer Society.
An estimated nine out of 10 people with bladder cancer are over age 55. The average age at the time of diagnosis is 73.