Primary Tumor T

Tx Primary cannot be assessed T0 No evidence of primary tumor

Tis Carcinoma in situ: intraepithelial tumor without invasion of the lamina propria T1 Tumor invades lamina propria or submucosa T2 Tumor invades muscularis propria or subserosa T3 Tumor penetrates serosa (visceral peritoneum) T4 Tumor invades adjacent structures

Regional Lymph Nodes

NX Cannot be assessed N0 No regional node mets

N1 Mets in 1-6 nodes N2 Mets in 7-15 nodes N3 Mets in >15 nodes

Distant Metastasis (M)

MX Cannot be assessed M0 No distant metastasis M1 Distant metastasis

Note: T=tumor, N=lymph node involvement, M=metastasis._

TABLE 10.2 Four-Stage Grouping for Gastric Carcinoma Using TNM Data

Stage TNM-Stage

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