Table 33.6. Breast cancer staging

Table 33.6. Breast cancer staging.
Stage	Definition
Stage I	Primary tumor ≤2 cm without axillary lymph node involvement
Stage II	Primary tumor >2 cm and ≤5 cm with or without axillary lymph node involvement Primary tumor ≤2 cm with axillary lymph node involvement Primary tumor >5 cm without axillary lymph node involvement
Stage III	Any primary tumor size with fixed axillary lymph nodes Primary tumor directly extending to chest wall or skin with or without axillary lymph node involvement Any primary tumor size with internal mammary lymph node involvement
Stage IV	Presence of distant metastases including supraclavicular lymph node involvement
Source: From the American Joint Committee on Cancer,²³² with permission.