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. 2016 Jan 12;50(2):83–95. doi: 10.4132/jptm.2015.11.23

Table 1.

AJCC 6th edition

pN0 (sn) No metastasis-sentinel lymph node
pN0 (i+) Isolated tumor cells (single cells or cell deposits) no larger than 0.2 mm
pN1mi Metastatic lesion larger than 0.2–2.0 mm
pN1mi (i+) H&E stain negative but IHC stain detected micrometastasis
pN0 (mol-) Negative molecular findings using RT-PCR
pN0 (mol+) Positive molecular findings using RT-PCR

AJCC, American Joint Committee of Cancer; H&E, hematoxylin and eosin; IHC, immunohistochemical; RT-PCR, reverse transcriptase-polymerase chain reaction.