Stomach (excluding Gastrointestinal Stromal Tumor and Neuroendocrine Tumor)
C160 Cardia, esophagogastric junction
C161 Fundus of stomach
C162 Body of stomach
C163 Gastric antrum
C165 Lesser curvature of stomach, NOS
C166 Greater curvature of stomach, NOS
C168 Overlapping lesion of stomach
C169 Stomach, NOS
**Note 1:** The following sources were used in the development of this schema
* SEER Extent of Disease 1988: Codes and Coding Instructions (3rd Edition, 1998) (https://seer.cancer.gov/archive/manuals/EOD10Dig.3rd.pdf)
* SEER Summary Staging Manual-2000: Codes and Coding Instructions (https://seer.cancer.gov/tools/ssm/)
* Collaborative Stage Data Collection System, version 02.05: https://cancerstaging.org/cstage/Pages/default.aspx
* Chapter 17 *Stomach*, in the AJCC Cancer Staging Manual, Eighth Edition (2017) published by Springer International Publishing. Used with permission of the American College of Surgeons, Chicago, Illinois.
**Note 2:** If a tumor involves the esophagogastric junction (EGJ) and its epicenter is less than or equal to 2 cm into the proximal stomach (i.e. less than or equal to 2 cm distal to the EGJ), use the esophageal cancer schema for stage groupings (see the EsophagusGEJunction schema). Tumors involving the EGJ with their epicenter >2 cm into the proximal stomach (i.e., >2cm distal to the EGJ) are now classified using the stomach schema. Cardia cancers that do not invade the EGJ should be classified based on the stomach cancer schema for stage groupings.
**Note 3:** *Schema Discriminator 1: EsophagusGEJunction (EGJ)/Stomach* is used to discriminate between EsophagusGEJunction and Stomach which are coded to ICD-O-3 code C160.