What is Bladder Cancer?
Bladder cancer is when cells in the bladder grow uncontrollably and can possibly spread through the bladder and into other parts of the body.
Nearly all bladder cancers begin in the innermost layer of the bladder (mucous membrane). In some cases, the cancer may progress by growing into the deeper layers of the bladder wall.
Bladder cancers can be divided into two categories:
- Non-invasive tumours: the cancer is only found in the lining of the bladder. Sometimes these are called superficial tumours because the cancerous cells have not invaded deeper layers of the bladder. This does not necessarily mean the cancer is not serious.
- Invasive tumours: the cancer has spread beyond the lining of the bladder, either into the lamina propria, the muscle, or through the bladder wall. All invasive tumours are serious.