If no surgery is done on the bladder or lymph nodes, the clinical stage is the only stage that is obtained. The ABCD is older and is a broad description of the cancer. With the ABCD system the cancer is denoted by one letter followed by one number A1, B2 etc. Each letter is followed by a describing number, T2aN0M0. This may be confusing but ask if you have questions.
Tumor invades perivesical fat i. microscopically ii.
It may come back in the bladder or in another part of the body. The grade gives us an idea of how fast the cancer might be growing or how aggressive it might be. High grade cancers grow faster and spread earlier than low grade cancers. It is still used in general discussions about cancer. The denominator or second number states what system they use.