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Table 2. Regional Lymph Nodes (N)a

NXRegional lymph node(s) cannot be assessed.
N0No regional lymph node metastasis.b
N1Metastases in 1–2 regional lymph nodes.
N2Metastases in 3–6 regional lymph nodes.
N3Metastases in ≥7 regional lymph nodes.
N3aMetastases in 7–15 regional lymph nodes.
N3bMetastases in ≥16 regional lymph nodes.

aReprinted with permission from AJCC: Stomach. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 117-26.
bA designation of pN0 should be used if all examined lymph nodes are negative, regardless of the total number removed and examined.