Bladder Cancer Process   The development and progress of bladder
cancer is not fully understood. Doctors do know more than 90
percent of all bladder cancers originate in the urothelium - a
thin surface layer that lines the inside of the bladder.1 The
majority of bladder tumors do not invade the bladder muscle and
are confined to the urothelium or the lamina propria – a layer
of loose connective tissue next to the urothelium.  Varied
Growth  Most cancerous bladder tumors are not aggressive, but
when they are the tumors can invade the wall of the bladder and
spread to other parts of the body. This can possibly result in
death but even aggressive forms of bladder cancer may not spread
or become life-threatening if they are found and treated in the
early stages. There are several stages of bladder cancer and
several types of diagnostic tests used to determine if and how
far the disease has spread.  How Cancer Spreads  Cancer can
spread in the body in three ways:    1. Cancer can invades the
surrounding normal tis