T: primary tumor
TXPrimary tumor cannot be assessed
T0No evidence of primary tumor
T1aTumor less than 1 cm in size
T1bTumor 1 to 2 cm in size
T2Tumor invades muscularis propria or is greater than 2 cm in size
T3Tumor invades subserosa or non peritonealized pericolic / perirectal tissue
T4Tumor perforates the visceral peritoneum or invades other organs
N: regional lymph nodes
NXRegional lymph nodes cannot be assessed
N0No regional lymph node metastasis
N1Regional lymph node metastasis
M: distant metastasis
M0No distant metastasis
M1aHepatic metastasis only
M1bExtrahepatic metastasis only
M1cHepatic and extrahepatic metastases