An official website of the United States government
Home
SEER Inquiry System - Report
Produced: 11/10/2025 9:44 AM
Question 20071107
Inquiry Details
References:
2007 SEER Manual, C-643. Appendix C
Question:
MP/H Rules/Recurrence--Breast: If the pathologist and oncologist call a 2007 lobular carcinoma that appears in a skin nodule of a mastectomy scar a recurrence of a patient's 1975 primary breast duct carcinoma, should we abstract this as a new primary? See Discussion.
Discussion:
Answer:
For cases diagnosed 2007 or later, abstract the 2007 diagnosis as a separate primary using rule M5.
Rule M5 applies to this case because it comes before rule M12. Furthermore, based on your statement, the answer presumes that the original tumor was duct carcinoma only, there was no lobular carcinoma present. This must be a new primary because there are two different histologies.
The 2007 MP/H rules were developed with input from clinicians. They advised that a subsequent breast tumor more than five years later is a new primary. It is important to apply the rules so that these cases are handled in a consistant manner across all registries.
