CARCINOMA OF THE STOMACH STAGING CLASSIFICATION

Source: American Joint Committee on Cancer (AJCC), AJCC Cancer Staging Handbook, 7th edition.
CARCINOMA OF THE STOMACH STAGING CLASSIFICATION	Carcinoma in situ: intraepithelial tumor without invasion of the lamina propria
IA	Tumor invades lamina propria, muscularis mucosae, or submucosa without lymph node involvement or metastasis
IB	Tumor invades muscularis propria without lymph node involvement or metastasis; or tumor invades lamina propria, muscularis mucosae, or submucosa with metastasis in 1–2 regional lymph nodes
IIA	Tumor penetrates subserosal connective tissue without invasion of visceral peritoneum or adjacent structures and without lymph node involvement or metastasis; or tumor invades muscularis propria with metastasis in 1–2 regional lymph nodes; or tumor invades lamina propria, muscularis mucosae, or submucosa with metastasis in 3–6 regional lymph nodes
IIB	Tumor invades serosa (visceral peritoneum) without lymph node involvement or metastasis; or tumor penetrates subserosal connective tissue without invasion of visceral peritoneum or adjacent structures with metastasis in 1–2 regional lymph nodes; or tumor invades muscularis propria with metastasis in 3–6 regional lymph nodes; or tumorinvades lamina propria, muscularis mucosae, or submucosa with metastasis in 7 or more regional lymph nodes
IIIA	Tumor invades serosa (visceral peritoneum) with metastasis in 1–2 regional lymph nodes; or tumor penetrates subserosal connective tissue without invasion of visceral peritoneum or adjacent structures with metastasis in 3–6 regional lymph nodes; or tumor invades muscularis propria with metastasis in 7 or more regional lymph nodes
IIIB	Tumor invades adjacent structures with metastasis in 0–2 regional lymph nodes; or tumor invades serosa (visceral peritoneum) with metastasis in 3–6 regional lymph nodes; or tumor penetrates subserosal connective tissue without invasion of visceral peritoneum or adjacent structures with metastasis in 7 or more regional lymph nodes
IIIC	Tumor invades adjacent structures with metastasis in 3 or more regional lymph nodes; or tumor invades serosa (visceral peritoneum) with metastasis in 7 or more regional lymph nodes
IV	Distant metastasis

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