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
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