Schema Discriminator 2: Histology Discriminator for 8020/3

This input is used for staging

Description

Histology code 8020/3 is defined as “undifferentiated carcinoma.” In the AJCC 8th chapter for Esophagus, this histology code is further subdivided into squamous or glandular component, which are staged differently. A schema discriminator is necessary to distinguish between these histologies so that the appropriate stage group table is used.

Rationale

A schema discriminator is used to assign AJCC ID when site and histology alone are insufficient to identify the applicable AJCC staging method and to assign Schema ID, which links each case to the appropriate SSDIs, Grade, Summary Stage and EOD data collection system.

Additional Info

**Source documents:** pathology report For further information, refer to the **Esophagus** cancer protocol published by the College of American Pathologist for the AJCC Staging Systems *Esophagus (including GE Junction) *

Notes

**Note:** **Schema discriminator for 8020/3** * A schema discriminator is used to discriminate for histology 8020/3: Undifferentiated carcinoma to determine which AJCC Stage Group table to use. * **8020/3: Undifferentiated carcinoma with squamous component (see code 1)** Use the Squamous Cell Carcinoma AJCC Stage Group Table * **8020/3: Undifferentiated carcinoma with glandular component (see code 2)** Use the Adenocarcinoma AJCC Stage Group Table * **8020/3: Undifferentiated carcinoma, NOS (no mention of squamous or glandular component) (see code 3)** Use the Squamous Cell Carcinoma AJCC Stage Group Table

NAACCR Item

NAACCR #3927

Metadata

SSDI

Code	Description	Schema ID #/Description
1	Undifferentiated carcinoma with squamous component	00161: Esophagus (including GE junction) Squamous
2	Undifferentiated carcinoma with glandular component	00169: Esophagus (including GE junction) (excluding Squamous)
9	Undifferentiated carcinoma, NOS	00161: Esophagus (including GE junction) Squamous
<BLANK>	Histology is NOT 8020, Discriminator is not necessary