The bladder is located in the pelvis. It collects and stores urine and has a muscular wall that allows it to contract and expand. According to the American Cancer Society, more than 500,000 people in the United States are bladder cancer survivors. Cancer limited to the lining of the bladder is called non-muscle invasive bladder cancer (NMIBC). This type of cancer is sometimes called superficial bladder cancer. More than 75 percent of bladder cancer is diagnosed as a NMIBC and it has an excellent survival rate. Muscle invasive bladder cancer penetrates the layers of muscles in the bladder and is more likely to spread to other parts of the body but is often still quite curable. Bladder cancer is four times more common in men than in women. It is two times more common in Caucasians than African-Americans.