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Procedure

Endoscopic resection Partial gastrectomy, proximal Partial gastrectomy, distal Partial gastrectomy, Other Total gastrectomy Other Not specified

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Tumor Site

Cardia Fundus Body Antrum Pylorus Other Not specified

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Tumor Size (cm)

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Histologic Type (WHO classification)

Tubular (intestinal) adenocarcinoma Poorly cohesive carcinoma (including signet-ring cell carcinoma and variants) Mucinous adenocarcinoma (>50% mucinous) Mixed carcinoma Micropapillary adenocarcinoma Adenocarcinoma of fundic-gland type Squamous cell carcinoma Adenosquamous carcinoma Undifferentiated (anaplastic) carcinoma Gastroblastoma Large cell neuroendocrine carcinoma Small cell neuroendocrine carcinoma Neuroendocrine carcinoma (poorly differentiated) Mixed adenocarcinoma-neuroendocrine carcinoma (small cell or large cell ) Mixed adenocarcinoma-neuroendocrine tumor Other histologic type

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Histologic Grade

G1: Well differentiated G2: Moderately differentiated G3: Poorly differentiated, undifferentiated Other GX: Cannot be assessed Not applicable

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Tumor Extension A word about tumor extent

No evidence of primary tumor Carcinoma in situ (high-grade dysplasia) Tumor invades the lamina propria Tumor invades the muscularis mucosae Tumor invades the submucosa Tumor invades the muscularis propria Tumor penetrates the subserosal connective tissue (without invasion of the visceral peritoneum or other structures) Tumor invades the serosa (visceral peritoneum) Tumor invades adjacent structures Cannot be assessed

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Margins

All margins are uninvolved by tumor At least one margin involved by tumor

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Treatment Effect

No known presurgical therapy Present Absent Cannot be determined

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Lymphovascular Invasion

Not identified Present Cannot be determined

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+ Perineural Invasion

Not identified Present Cannot be determined

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Regional Lymph Nodes

Check here if any lymph nodes submitted?

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Pathologic Staging (pTNM)

TNM Descriptors (select all that apply)

Not applicable m r y

pT

pTX: Primary tumor cannot be assessed pT0: No evidence of primary tumor pTis: Carcinoma in situ: intraepithelial tumor without invasion of the lamina propria, high-grade dysplasia pT1a: Tumor invades the lamina propria or muscularis mucosae pT1b: Tumor invades the submucosa pT2: Tumor invades the muscularis propria# pT3: Tumor penetrates the subserosal connective tissue without invasion of the visceral peritoneum or adjacent structures pT4: Tumor invades the serosa (visceral peritoneum) or adjacent structures pT4a: Tumor invades the serosa (visceral peritoneum) pT4b: Tumor invades adjacent structures/organs

pN

pNX: Regional lymph node(s) cannot be assessed pN0: No regional lymph node metastasis pN1: Metastasis in one or two regional lymph nodes pN2: Metastasis in three to six regional lymph nodes pN3: Metastasis in seven or more regional lymph nodes pN3a: Metastasis in seven to 15 regional lymph nodes pN3b: Metastasis in 16 or more regional lymph nodes

pM

pMx: Not applicable pM1: Distant metastasis

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+ Additional Pathologic Findings (select all that apply

None identified Intestinal metaplasia Low-grade dysplasia High-grade dysplasia Helicobacter pylori-type gastritis Autoimmune atrophic chronic gastritis Polyps Other

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+ Ancillary Studies:

Immunohistochemistry

Choose HER2 Testing - If performed

HER2 Testing

Not performed HER2 by IHC HER2 by FISH HER2 by genomic testing