TNM staging of breast cancer
Last reviewed 06/2023
- T0 - no evidence of primary tumour
- T1 - the tumour is 2 cm or less in diameter, with no skin involvement - except in the case of Paget's disease where confined to the nipple - and no nipple retraction or fixation
- T2 - tumour greater than 2 cm but less than 5 cm
- T3 - tumour greater than 5 cm in greatest diameter, less than 10 cm
- T4 - greater than 10 cm or skin or chest wall involvement or peau d'orange
- N0 - no palpable ipsilateral axillary nodes
- N1 - palpable, ipsilateral axillary nodes
- N2 - ipsilateral axillary nodal metastases fixed to one another or to other structures
- N3 - metastases to ipsilateral internal mammary nodes
- M0 - no evidence of metastases
- M1 - distant metastases (includes ipsilateral supraclavicular nodes)