Answer by
Kath (1537)
There are three main stages 'T', 'N' and 'M'. Within the 'T' stage there are T0, T1, T2, T3. In the 'N' stage there are 2, N0 and N1. 'M' stage also has two, M0 and M1, and there are sub catagories under M1. 'M' is the last stage.