SEER Inquiry System - Question 20010036 Details

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Produced: 10/19/2025 11:07 PM

Question 20010036

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Inquiry Details

References:

SEER Program Code Man, 3rd Ed, 96, 97. Rule 1c

Question:

Histology (Pre-2007)--Breast: What code is used to represent the histology for a single lesion with "metaplastic carcinoma" and the majority of tumor has sarcomatoid appearance? Squamous cell carcinoma and high grade intraductal carcinoma are also present. Is the term "sarcomatoid" equivalent to sarcoma?

Discussion:

Answer:

For tumors diagnosed prior to 2007:

For cases diagnosed on or after 1/1/2001: Code the Histology field to 8575/3 [metaplastic carcinoma]. Sarcomatoid is not coded as sarcoma.

The terms metaplastic carcinoma, squamous cell carcinoma and intraductal carcinoma are used, but only the metaplastic and squamous cell carcinomas are invasive. Metaplastic, loosely defined, means tissue that is not normal.

For tumors diagnosed 2007 or later, refer to the MP/H rules. If there are still questions about how this type of tumor should be coded, submit a new question to SINQ and include the difficulties you are encountering in applying the MP/H rules.

History:

For cases diagnosed prior to 1/1/2001: Code the Histology field to 8070/3 [squamous cell carcinoma, NOS]. The term "metaplastic carcinoma" is not found in the ICD-O-2.

Cancer Site Category:

Breast

Data Item Category:

Histology

Other Category:

N/A

Year:

2001