STAGE GROUPING                            

Stage 0            Tis           NO           MO       *NOTE: The prognosis of patients with pN1a is similar to     Stage I             T1           NO           MO         that of patients with pNO.
Stage IIA         TO          N1            MO
                         T1           N1*          MO
                         T2           NO           MO
Stage IIB         T2           N1            MO
                          T3           NO           MO
Stage IIIA        TO          N2            MO
                          T1           N2            MO
                          T2           N2            MO
                          T3           N2,N2      MO
Stage IIIB        T4           Any N      MO
                          Any T     N3            MO        
Stage IV           Any T     Any N      M1