Stomach (excluding Gastrointestinal Stromal Tumor and Neuroendocrine Tumor)

Primary Site Histology Schema Discriminator: EsophagusGEJunction (EGJ)/Stomach Staging Type
C161-C162 8000-8152, 8154-8231, 8243-8245, 8247-8248, 8250-8576, 8940-8950, 8980-8990 000, 030, 999 TNM 7 and Summary Stage
C161-C162 8577-8934, 8951-8979, 8991-9136, 9141-9582, 9700-9701 000, 030, 999 Summary Stage only
C163-C166, C168-C169 8000-8152, 8154-8231, 8243-8245, 8247-8248, 8250-8576, 8940-8950, 8980-8990 <Any value> TNM 7 and Summary Stage
C163-C166, C168-C169 8577-8934, 8951-8979, 8991-9136, 9141-9582, 9700-9701 <Any value> Summary Stage only

If you are working with a site/histology that only summary stages and you need to directly code it, please use the SEER Summary Stage 2000 manual

Notes

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:** This schema is based on the UICC chapter *Stomach,* pages 73-77. * Primary sites C165, C166, C168, and C169 are listed in the chapter heading but are not specified in the anatomic subsites in this chapter of the UICC manual; however, they are included in this schema and TNM staged if appropriate histology criteria are met * **Site-Specific Factor 25, Schema Discriminator: EsophagusGEJunction (EGJ)/Stomach** is used to discriminate between esophagusGEjunction and stomach which are coded to ICD-O-3 codes C160-C162. **Note 2:** In addition to directly assigning TNM, Summary Stage 2000 (SS2000) must be captured. If directly assigning SS2000, use the *Stomach* chapter on page 80 of the [SS2000 on-line manual](https://seer.cancer.gov/tools/ssm/ssm2000/SSSM2000-122012.pdf#page=80).

Main Data Items

Name Default Value Used for Staging NAACCR Item Required By Metadata
Clinical T <BLANK> Yes NAACCR #940
tnmClinT 		None
Clinical N <BLANK> Yes NAACCR #950
tnmClinN 		None
Clinical M <BLANK> Yes NAACCR #960
tnmClinM 		None
TNM Clin Stage Group 99 Yes NAACCR #970
tnmClinStageGroup 		None
Pathologic T <BLANK> Yes NAACCR #880
tnmPathT 		None
Pathologic N <BLANK> Yes NAACCR #890
tnmPathN 		None
Pathologic M <BLANK> Yes NAACCR #900
tnmPathM 		None
TNM Path Stage Group 99 Yes NAACCR #910
tnmPathStageGroup 		None
SSF2: Specific Location of Tumor 988 No NAACCR #2890
csSiteSpecificFactor2 		None None
SSF13: Carcinoembryonic Antigen (CEA) 988 No NAACCR #2867
csSiteSpecificFactor13 		None None
SSF14: Carcinoembryonic Antigen (CEA) Lab Value 988 No NAACCR #2868
csSiteSpecificFactor14 		None None
SSF15: Carbohydrate Antigen 19-9 (CA 19-9) Lab Value 988 No NAACCR #2869
csSiteSpecificFactor15 		None None
SSF25: Schema Discriminator: EsophagusGEJunction (EGJ)/Stomach 999 Yes NAACCR #2879
csSiteSpecificFactor25 		All None

Additional Data Items

Name Default Value Used for Staging NAACCR Item Required By Metadata
Year of Diagnosis <BLANK> No NAACCR #390
dateOfDiagnosis 		None
Primary Site <BLANK> Yes NAACCR #400
primarySite 		None
Histology <BLANK> Yes NAACCR #522
histologicTypeIcdO3 		None
Behavior <BLANK> Yes NAACCR #523
behaviorCodeIcdO3 		None
RX Summ Systemic/Surgery Sequence <BLANK> Yes NAACCR #1639
rxSummSystemicSurSeq 		None
RX Summ Surgery/Radiation Sequence <BLANK> Yes NAACCR #1380
rxSummSurgRadSeq 		None
Regional Nodes Positive <BLANK> Yes NAACCR #820
regionalNodesPositive 		None

Initial Context

Staging Methods

Expand All | Collapse All

TNM 7 Stage

Inclusion Table

Histology
8000-8152
8154-8231
8243-8245
8247
8248
8250-8576
8940-8950
8980-8990

Start

Additional Context
Pathologic Stage Group = 90
Clinical Stage Group = 90

Next Step

  2. Parse T
  3. clin_t_prefix
    tmp_clin_t

Next Step

  2. Parse N
  3. clin_n_prefix
    tmp_clin_n

Next Step

  2. Parse M
  3. tmp_clin_m
    clin_m_prefix

Next Step

  2. Parse T
  3. tmp_path_t
    path_t_prefix

Next Step

  2. Parse N
  3. tmp_path_n
    path_n_prefix

Next Step

  2. Parse M
  3. tmp_path_m
    path_m_prefix

Next Step

  2. Determine Default T
  3. Source T
    tmp_path_t
    tmp_clin_t
    tmp_combined_t

Next Step

  2. Determine Default N
  3. tmp_combined_n
    tmp_clin_n
    tmp_path_n
    Source N

Next Step

  2. Determine Default M
  3. tmp_path_m
    tmp_combined_m
    tmp_clin_m
    Source M

Next Step

  2. TNM 7 Stage Group
  3. Clinical Stage Group

Next Step

  2. TNM 7 Path Stage Group
  3. Pathologic Stage Group

Next Step

  2. Adjustments for No Clin or No Path
  3. tmp_combined_n
    tmp_combined_m
    Source T
    Clinical Stage Group
    Pathologic Stage Group
    Source N
    tmp_combined_t
    Source M

End

Combined Stage

Inclusion Table

Histology
8000-8152
8154-8231
8243-8245
8247
8248
8250-8576
8940-8950
8980-8990

Start

Additional Context
Combined Stage Group = 90
Combined N = 90
Combined M = 90
Combined T = 90

Next Step

  2. Stop if No Clin and No Path
  3. Combined M
    Combined N
    Source T
    tmp_continue
    Combined T
    Combined Stage Group
    Source N
    Source M

Next Step

  2. Combined T
  3. Source T
    tmp_combined_t

Next Step

  2. Combined N for Tis Cancers
  3. tmp_combined_n
    Source N

Next Step

  2. Combined M
  3. tmp_combined_m
    tmp_source_m
    Source M

Next Step

  2. Determine Combined Prefix
  3. cmb_t_prefix

Next Step

  2. Determine Combined Prefix
  3. cmb_n_prefix

Next Step

  2. Determine Combined Prefix
  3. cmb_m_prefix

Next Step

  2. Concatenate T
  3. Combined T

Next Step

  2. Concatenate N
  3. Combined N

Next Step

  2. Concatenate M
  3. Combined M

Next Step

  2. TNM 7 Path Stage Group
  3. Combined Stage Group

End

Outputs

Name Default Value Description NAACCR Item Metadata
Derived Version {{ctx_alg_version}} None None
Derived SEER Clin Stage Group 88 NAACCR #3610
derivedSeerClinStgGrp 		None
Derived SEER Path Stage Group 88 NAACCR #3605
derivedSeerPathStgGrp 		None
Derived SEER Combined Stage Group 88 NAACCR #3614
derivedSeerCmbStgGrp 		None
Derived SEER Combined T 88 NAACCR #3616
derivedSeerCombinedT 		None
Derived SEER Combined N 88 NAACCR #3618
derivedSeerCombinedN 		None
Derived SEER Combined M 88 NAACCR #3620
derivedSeerCombinedM 		None
Derived SEER Combined T Source <BLANK> NAACCR #3622
derivedSeerCmbTSrc 		None
Derived SEER Combined N Source <BLANK> NAACCR #3624
derivedSeerCmbNSrc 		None
Derived SEER Combined M Source <BLANK> NAACCR #3626
derivedSeerCmbMSrc 		None