Table 3.3 Open in new tab Basic form of... | Oxford Academic

Table 3.3

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Basic form of TNM classification^*

Classification	Interpretation
Primary tumour (T)
TX	Primary tumour cannot be evaluated
T0	No evidence of primary tumour
Tis	Tumour in situ
T1, T2, T3, T4	Size and extent of primary tumour
Regional lymph nodes (N)
NX	Regional lymph nodes cannot be evaluated
N0	No regional lymph node involvement
N1, N2, N3	Number and location of involved lymph nodes
Distant metastasis (M)
MX	Distant metastasis cannot be evaluated
M0	No distant metastasis
M1	Distant metastasis

Classification	Interpretation
Primary tumour (T)
TX	Primary tumour cannot be evaluated
T0	No evidence of primary tumour
Tis	Tumour in situ
T1, T2, T3, T4	Size and extent of primary tumour
Regional lymph nodes (N)
NX	Regional lymph nodes cannot be evaluated
N0	No regional lymph node involvement
N1, N2, N3	Number and location of involved lymph nodes
Distant metastasis (M)
MX	Distant metastasis cannot be evaluated
M0	No distant metastasis
M1	Distant metastasis

^*

Additional codes used with the TNM: pul, pulmonary; hep, hepatic; V, vascular; Ly, lymphatic vessels; R, radial margin. Prefixes used with the TNM: u, ultrasound; r, radiological; p, pathological.