- Determining Tumor Size
- Only the invasive component
- Identified specific imaging modalities including MMG, US and MRI
- Tx
- T0
- Tis
- Carcinoma in situ, with no evidence of an invasive component.
- Tis(DCIS)
- Tis(LCIS)
- Tis(Paget’s) : Paget’s dz of the nipple NOT associated with underlying breast cancer
- T1
- Tumor ≤ 20mm in greatest dimension
- T1mi : microinvasion ≤ 1mm
- T1a : 1< tumor ≤5mm
- T1b : 5< tumor ≤10mm
- T1c : 10< tumor ≤ 20mm
- Tumor ≤ 20mm in greatest dimension
- T2 : 20 < tumor ≤ 50mm
- T3 : > 50mm
- T4 : Any size with direct extension to the chest wall and/or to the skin (ulceration or skin nodules)
* Note that pectoralis muscle invasion is not categorized as T4 - T4a : Extension to chest wall
- T4b : Edema (including peau d’orange) or ulceration of the skin of the breast, or satellite skin nodules confirmed to the same breast
- T4c : Both T4a and T4b
- T4d : Inflammatory breast cancer
- Inflammatory Carcinoma(T4d)
- Clinocipathologic entity characterized by diffuse erythema and edema(peau d’orange) of the breast
- Classically, the skin changes arise quickly in the affected breast
- Due to tumor emboli within dermal lymphatics
- Typical skin changes involving ≥ 1/3 of the skin of breast – T4d
N staging
- NX : Regional lymph nodes cannot be assessed
- N0 : No regional lymph node metastasis
- N1 (Early breast cancer)
- Metastases to movable ipsilateral level I, II axillary lymph nodes
- N2 (Advanced breast cancer)
- N2a : Metastases in ipsilateral level I, II axillary lymph nodes fixed to one another (matted) or to other structures
- N2b : Metastases only in clinically detected ipsilateral internal mammary nodes and in the absence of clinically evident level I,II axillary lymph node metastases
- N3 (Advanced breast cancer)
- ipsilateral infraclavicular LN with or without axillary involvement
- ipsiltareal internal mammary LN and in the presence of clinically evident axillary LN metastasis
- ipsilateral supraclavicular LN with or without axillary or internal mammary LN involvement
- N3a : Metastasis in ipsilateral infraclavicular lymph node(s)
- N3b : Metastasis in ipsilateral internal mammary lymph node(s) and axillary lymph node(s)
- N3c : Metastasis in ipsilateral supraclavicular lymph node(s)