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SEER Inquiry System - Report
Produced: 10/09/2025 4:11 PM
Question 20051020
Inquiry Details
References:
#1: 2004 SEER Manual, C-476. App C, July 2005
#2: CS Manual, Part II, 458. Vers 01.02.00, April 2005
Question:
CS Extension/CS Site Specific Factor--Breast: How is extension (localized or unknown) and SSF6 (entire tumor in situ or 888) coded for an in situ breast primary in which bone metastasis is diagnosed 4 months following the mastectomy? See Discussion.
Discussion:
In situ breast primary with bone mets. No mets work up prior to mastectomy done 2/04. Path: 2.5 cm mass: ductal carcinoma in situ, solid type, with comedonecrosis (no invasive carcinoma found in mastectomy specimen). Bone scan done 4/04 showed compression fractures. MRI 6/04 showed diffuse metastatic disease of the bones.
Answer:
This answer was provided in the context of CSv1 coding guidelines. The response may not be used after your registry database has been converted to CSv2.
First, determine whether the bone mets in this case are progression of disease. If the patient was asymptomatic at the time of the mastectomy, the bone mets are disease progression, not initial stage.
If the initial stage includes the bone mets and they are not disease progression, extension must be coded to at least 10. Code site-Specific Factor 6 to 040 [Size of entire tumor coded, size of invasive component not stated].
Cancer Site Category:
Breast
Data Item Category:
N/A
Other Category:
N/A
Year:
2005
