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SEER Inquiry System - Report
Produced: 02/06/2026 11:20 AM
Question 20021143
Inquiry Details
References:
SEER Program Code Man, 3rd Ed, 11
Question:
Multiple Primaries (Pre-2007)--Breast: Should just one primary be reported when only ductal carcinoma in situ is diagnosed initially but the mastectomy performed as part of the first course of cancer-directed therapy, but more than 2 months after diagnosis, contains a diagnosis of invasive ductal carcinoma? See discussion.
Discussion:
How do we code this case in light of the EOD guideline that states we include all information collected within 4 months of diagnosis or through the completion of first surgery in the absence of disease progression when coding.
Answer:
For tumors diagnosed 1998-2003:
Report this case as one invasive primary, unless stated to be two primaries by the clinician. This appears to be a single primary with different behaviors, rather than separate tumors.
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.
Cancer Site Category:
Breast
Data Item Category:
N/A
Other Category:
Multiple primaries
Year:
2002
