GIST 
T: primary tumor
TXPrimary tumor cannot be assessed
T0No evidence of primary tumor
T1Tumor 2 cm or less
T2Tumor more than 2 cm but not more than 5 cm
T3Tumor more than 5 cm but not more than 10 cm
T4Tumor more than 10 cm in greatest dimension
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
M1Distant metastasis