SEER Inquiry System - Question 20021143 Details

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Produced: 05/14/2026 4:58 PM

Question 20021143

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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