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SEER Inquiry System - Report
Produced: 10/22/2025 6:26 PM
Question 20100054
Inquiry Details
References:
2010 SEER Manual. Appendix C
Question:
MP/H Rules/Multiple primaries--Breast: How many primaries are accessioned if a pathology specimen reveals an infiltrating mammary carcinoma with mixed tubular and lobular features, 2.3 cm, low grade cribriform in situ ductal carcinoma, and Paget disease of the overlying skin with ulceration? See Discussion.
Discussion:
According to SINQ 20081134 the histology would be 8524 if this is one primary.
Answer:
For cases diagnosed 2007 or later, this is a single primary.
In order to determine whether this case represents a single or multiple primary, you must first determine the correct histology code for the underlying tumor. Using rule H9, ignore the DCIS.
See Table 3 in the equivalent terms and definitions. Infiltrating lobular, tubular, and Paget are coded to a single histology code (8524/3). Our current multiple primary rules do not say infiltrating lobular and tubular and Paget are a single primary. This was an omission and will be corrected in a future revision. Thank you for bringing this omission to our attention.
Cancer Site Category:
Breast
Data Item Category:
N/A
Other Category:
Multiple primaries
Year:
2010
