Table 1. Stage grouping (descriptor definitions in Table 2) (10).

Stage	T	N	M
I	T1	N0	M0
II	T2	N0	M0
IIIA	T3	N0	M0
IIIB	T4	N0	M0
IVA	T any	N1	M0
	T any	N0/N1	M1a
IVB	T any	N2	M0/M1a
	T any	N any	M1b