Name	Value
NAME	BREAST
6TH EDITION (N) CODES	DESCRIPTION: NCA CODE: NX DESCRIPTION: Metastasis in clinically apparent internal, etc CODE: N2b DESCRIPTION: Metastasis in 10 or more axillary lymph nodes, etc CODE: N3 DESCRIPTION: Metastasis in 10 or more axillary lymph nodes, etc CODE: N3a DESCRIPTION: Metastasis in clinically apparent ipsilateral, etc CODE: N3b DESCRIPTION: Metastasis in ipsilateral supraclavicular CODE: N3c DESCRIPTION: NA CODE: NA DESCRIPTION: No metastasis, negative IHC CODE: N0(i-) DESCRIPTION: No metastasis, positive IHC, no cluster > 0.2 mm CODE: N0(i+) DESCRIPTION: No metastasis, negative molecular findings CODE: N0(mol-) DESCRIPTION: No metastasis, positive molecular findings CODE: N0(mol+) DESCRIPTION: NRN CODE: N0 DESCRIPTION: Metastasis in 1 to 3 axillary lymph nodes, etc CODE: N1 DESCRIPTION: Micrometastasis CODE: N1mi DESCRIPTION: Metastasis in 1 to 3 axillary lymph nodes CODE: N1a DESCRIPTION: Metastasis in internal mammary nodes etc CODE: N1b DESCRIPTION: Metastasis in 1 to 3 axillary lymph nodes, etc CODE: N1c DESCRIPTION: Metastasis in 4 to 9 axillary lymph nodes, etc CODE: N2 DESCRIPTION: Metastasis in 4 to 9 axillary lymph nodes, etc CODE: N2a
6TH EDITION (N) CODE HELP	Regional Lymph Nodes (N) Pathologic N0(mol-) No regional lymph node metastasis histologically, negative molecular findings (RT-PCR) N0(mol+) No regional lymph node metastasis histologically, positive molecular findings (RT-PCR) N1 Metastasis in 1 to 3 axillary lymph nodes, and/or in internal mammary nodes with microscopic disease detected by sentinel lymph node dissection but not clinically apparent N1mi Micrometastasis (greater than 0.2 mm, none greater than 2.0 mm) N1a Metastasis in 1 to 3 axillary lymph nodes N1b Metastasis in internal mammary nodes with microscopic disease detected by sentinel lymph node dissection but not clinically apparent N1c Metastasis in 1 to 3 axillary lymph nodes and in internal mammary lymph nodes with microscopic disease detected by sentinel lymph node dissection but not clinically apparent N2 Metastasis in 4 to 9 axillary lymph nodes, or in clinically apparent internal mammary lymph nodes in the absence of axillary lymph node metastasis N2a Metastasis in 4 to 9 axillary lymph nodes (at least one tumor deposit greater than 2.0 mm) NX Regional lymph nodes cannot be assessed (eg, previously removed, N2b Metastasis in clinically apparent internal mammary lymph nodes in the absence of axillary lymph node metastasis N3 Metastasis in 10 or more axillary lymph nodes, or in infraclavicular lymph nodes, or in clinically apparent ipsilateral internal mammary lymph nodes in the presence of 1 or more positive axillary lymph nodes; or in more than 3 axillary lymph nodes with clinically negative microscopic metastasis in internal mammary lymph nodes; or in ipsilateral supraclavicular lymph nodes N3a Metastasis in 10 or more axillary lymph nodes (at least one tumor deposit greater than 2.0 mm), or metastasis to the infraclavicular or not removed for pathologic study) lymph nodes N3b Metastasis in clinically apparent ipsilateral internal mammary lymph nodes in the presence of 1 or more positive axillary lymph nodes; or in more than 3 axillary lymph nodes and in internal mammary lymph nodes with microscopic disease detected by sentiel lymph node dissection but not clinically apparent N3c Metastasis in ipsilateral supraclavicular lymph nodes N0 No regional lymph node metastasis histologically, no additional examination for isolated tumor cells (ITC) N0(i-) No regional lymph node metastasis histologically, negative IHC N0(i+) No regional lymph node metastasis histologically, positive IHC, no IHC cluster greater than 0.2 mm
N-CLASS ENCODING	NCA CODE: NX ACOS CODE: NX Ipsilateral axillary fixed CODE: N2 ACOS CODE: N2 Ipsilateral internal mammary CODE: N3 ACOS CODE: N3 NA CODE: NA ACOS CODE: NA NRN CODE: N0 ACOS CODE: N0 Movable ipsilateral axillary lymph node(s) CODE: N1 ACOS CODE: N1 Micrometastasis (< 0.2 cm) CODE: N1a ACOS CODE: N1A Any > 0.2 cm CODE: N1b ACOS CODE: N1B 1 - 3, any > 0.2/all < 2 cm CODE: N1bi ACOS CODE: N1BI 4 or more, any > 0.2/all < 2 cm CODE: N1bii ACOS CODE: N1BII Beyond capsule < 2 cm CODE: N1biii ACOS CODE: N1BIII 2 cm or more CODE: N1biv ACOS CODE: N1BIV
5TH EDITION N-CODE HELP	Regional Lymph Nodes (N) and all less than 2 cm in greatest dimension N1bii Metastasis to 4 or more lymph nodes, any more than 0.2 cm and all less than 2 cm in greatest dimension N1biii Extension of tumor beyond the capsule of a lymph node metastasis less than 2 cm in greatest dimension N1biv Metastasis to a lymph node 2 cm or more in greatest dimension N2 Metastasis to ipsilateral axillary lymph nodes that are fixed to one another or to other structures N3 Metastasis to ipsilateral internal mammary lymph node(s) NX Regional lymph nodes cannot be assessed (e.g., previously removed, or not removed for pathologic study) N0 No regional lymph node metastasis N1 Metastasis to movable ipsilateral axillary lymph node(s) N1a Only micrometastasis (none larger than 0.2 cm) N1b Metastasis to lymph node(s), any larger than 0.2 cm N1bi Metastasis is 1 to 3 lymph nodes, any more than 0.2 cm

BREAST (23) AJCC STAGING GROUPS (164.33)