![]() They start in nerve-like cells called neuroendocrine cells. Less than 1% of bladder cancers are small cell carcinomas. These cancer cells start in gland-forming cells. Only about 1% of bladder cancers are adenocarcinomas. Seen with a microscope, the cells look much like the flat cells that are found on the surface of the skin. In the US, only about 1% to 2% of bladder cancers are squamous cell carcinomas. Other types of cancer can start in the bladder, but these are all much less common than urothelial (transitional cell) cancer. People with bladder cancer sometimes have tumors in these places, too, so all of the urinary tract needs to be checked for tumors. Urothelial cells also line other parts of the urinary tract, such as the part of the kidney that connects to the ureter (called the renal pelvis), the ureters, and the urethra. These cancers start in the urothelial cells that line the inside of the bladder. In fact, if you have bladder cancer it's almost always a urothelial carcinoma. ![]() Urothelial carcinoma, also known as transitional cell carcinoma (TCC), is by far the most common type of bladder cancer. ![]() Types of bladder cancer Urothelial carcinoma (transitional cell carcinoma)
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