cN3 breast cancer indicates evidence of metastases in ipsilateral infraclavicular (level III axillary) lymph node(s) — with or without level I, II axillary node involvement — or in ipsilateral internal mammary lymph node(s) with level I, II axillary lymph node metastasis; or metastasis in ipsilateral supraclavicular lymph node(s), with or without axillary or internal mammary lymph node involvement.
pN1 breast cancer indicates "micrometastases; or metastases in 1-3 axillary lymph nodes and/or in internal mammary nodes; and/or in clinically negative internal mammary nodes with micrometastases or macrometastases by sentinel lymph node biopsy."
cM1 breast cancer indicates distant metastases detected clinically and/or by imaging.
Learn more about breast cancer staging.
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Cite this: Stefania Morganti. Fast Five Quiz: Key Aspects of Metastatic Breast Cancer - Medscape - Dec 15, 2022.