8th edition AJCC gastric cancer staging

T staging
TXPrimary tumor cannot be assessed
T0No evidence of primary tumor
TisCarcinoma in situ: intraepithelial tumor without invasion of the lamina propria, high-grade dysplasia
T1Tumor invades lamina propria, muscularis mucosa or submucosa
T1aTumor invades lamina propria or muscularis mucosa
T1bTumor invades the submucosa
T2Tumor invades the muscularis propria
T3Tumor penetrates the subserosal connective tissue
T4Tumor invades the serosa or adjacent structures
T4aTumor invades the serosa
T4bTumor invades adjacent structures/organs
N staging
NXRegional lymph nodes cannot be assessed
N0No regional lymph node metastasis
N1Metastasis in 1-2 regional lymph nodes
N2Metastasis in 3-6 regional lymph nodes
N3Metastasis in 7 or more regional lymph nodes
N3aMetastasis in 7-15 regional lymph nodes
N3bMetastasis in 16 or more lymph nodes
M staging
M0No distant metastasis
M1Distant metastasis