Stomach (excluding Gastrointestinal Stromal Tumor and Neuroendocrine Tumor)

Primary Site Histology Schema Discriminator 1
C160 8000-8149, 8154, 8157, 8160-8231, 8243-8248, 8250-8682, 8690-8700, 8720-8790, 9700-9701 0, 3, 9
C161-C166, C168-C169 8000-8149, 8154, 8157, 8160-8231, 8243-8248, 8250-8682, 8690-8700, 8720-8790, 9700-9701

Notes

C160 Cardia, esophagogastric junction C161 Fundus of stomach C162 Body of stomach C163 Gastric antrum C164 Pylorus 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.

Data Items

Name Default Value Used for Staging NAACCR Item Required By Metadata
Year of Diagnosis <BLANK> No NAACCR #390 None
Primary Site <BLANK> Yes NAACCR #400 None
Histology <BLANK> Yes NAACCR #522 None
Behavior <BLANK> No NAACCR #523 None
Schema Discriminator 1 <BLANK> Yes NAACCR #3926 All SSDI
Tumor Size Clinical <BLANK> No NAACCR #752 None
Tumor Size Pathological <BLANK> No NAACCR #754 None
Tumor Size Summary 999 No NAACCR #756 None
Regional Nodes Positive 99 Yes NAACCR #820 None
Regional Nodes Examined 99 No NAACCR #830 None
RX Summ Surgery/Radiation Sequence <BLANK> No NAACCR #1380 None
RX Summ Systemic/Surgery Sequence <BLANK> No NAACCR #1639 None
EOD Primary Tumor 999 Yes NAACCR #772 None
EOD Regional Nodes 999 Yes NAACCR #774 None
EOD Mets 00 Yes NAACCR #776 None
SS2018 <BLANK> No NAACCR #764 None
Grade Clinical 9 No NAACCR #3843 CCCR/Canada
COC
NPCR
SEER		 SSDI
Grade Pathological 9 No NAACCR #3844 CCCR/Canada
COC
NPCR
SEER		 SSDI
Grade Post Therapy <BLANK> No NAACCR #3845 CCCR/Canada
COC
NPCR
SEER		 SSDI

Initial Context

Staging Methods

Expand All | Collapse All

Summary Stage 2018

Start

Additional Context
ss2018_derived = 90

Next Step

  2. EOD Primary Tumor
  3. ss2018_t

Next Step

  2. EOD Regional Nodes
  3. ss2018_n

Next Step

  2. EOD Mets
  3. ss2018_m

Next Step

  2. Summary Stage
  3. ss2018_derived

End

Outputs

Name Default Value Description NAACCR Item Metadata
Schema ID 00170 NAACCR #3800
None 		None
Derived Version {{ctx_alg_version}} None None
Derived Summary Stage 2018 9 NAACCR #762
None 		None