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    Breast Cancer Treatment (PDQ®): Treatment - Health Professional Information [NCI] - Stage Information for Breast Cancer

    Table 3. Regional Lymph Nodes (N)a

    Clinical
    a Reprinted with permission from AJCC: Breast. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 347-76.
    b Clinically detected is defined as detected by imaging studies (excluding lymphoscintigraphy) or by clinical examination and having characteristics highly suspicious for malignancy or a presumed pathologic macrometastasis based on fine-needle aspiration biopsy with cytologic examination. Confirmation of clinically detected metastatic disease by fine-needle aspiration without excision biopsy is designated with an (f) suffix, for example, cN3a(f). Excisional biopsy of a lymph node or biopsy of a sentinel node, in the absence of assignment of a pT, is classified as a clinical N, for example, cN1. Information regarding the confirmation of the nodal status will be designated in site-specific factors as clinical, fine-needle aspiration, core biopsy, or sentinel lymph node biopsy. Pathologic classification (pN) is used for excision or sentinel lymph node biopsy only in conjunction with a pathologic T assignment.
    NX Regional lymph nodes cannot be assessed (e.g., previously removed).
    N0 No regional lymph node metastases.
    N1 Metastases to movable ipsilateral level I, II axillary lymph node(s).
    N2 Metastases in ipsilateral level I, II axillary lymph nodes that are clinically fixed or matted.
    OR
    Metastases in clinically detectedb ipsilateral internal mammary nodes in theabsence of clinically evident axillary lymph node metastases.
    N2a Metastases in ipsilateral level I, II axillary lymph nodes fixed to one another (matted) or to other structures.
    N2b Metastases only in clinically detectedb ipsilateral internal mammary nodes and in theabsence of clinically evident level I, II axillary lymph node metastases.
    N3 Metastases in ipsilateral infraclavicular (level III axillary) lymph node(s) with or without level I, II axillary lymph node involvement.
    OR
    Metastases in clinically detectedb ipsilateral internal mammary lymph node(s) with clinically evident level I, II axillary lymph node metastases.
    OR
    Metastases in ipsilateral supraclavicular lymph node(s) with or without axillary or internal mammary lymph node involvement.
    N3a Metastases in ipsilateral infraclavicular lymph node(s).
    N3b Metastases in ipsilateral internal mammary lymph node(s) and axillary lymph node(s).
    N3c Metastases in ipsilateral supraclavicular lymph node(s).
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