NCIt definition : Stage IV includes T4b, NO,MO/any T NI, MO/ any T N2 MO,/ any T N3 MO/ any T any N
M1 : T4b: Tumor invades the pelvic wall, abdominal wall. N1: Metastasis in a single
lymph node, 2 cm or less in greatest dimension. N2: Metastasis in a single lymph node,
more than 2 cm but not more than 5 cm in greatest dimension; or multiple lymph nodes,
none more than 5 cm in greatest dimension. N3: Metastasis in a lymph node more than
5 cm in greatest dimension. M1: Distant metastasis.;