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SEER Inquiry System - Report
Produced: 03/30/2026 5:13 PM
Question 20081112
Inquiry Details
References:
2007 SEER Manual, C-644. Appendix C
Question:
MP/H Rules--Breast: Is a 2008 invasive ductal carcinoma counted as a new primary when it follows a 2005 invasive lobular carcinoma diagnosed in the same breast? See Discussion.
Discussion:
The patient has invasive lobular breast carcinoma excised in 2005. She returns in 2008 with a new invasive ductal carcinoma tumor same breast. Following MP/H rules, M10 seems to apply, which states this is still a single primary. Does this mean that this invasive ductal carcinoma is ignored and the patient remains in the registry with only a lobular carcinoma primary?
Answer:
For cases diagnosed 2007 or later:
Rule M10 applies. The 2008 diagnosis is not a new primary.
The abstract for the 2005 diagnosis should be annotated to include the new information.
Cancer Site Category:
Breast
Data Item Category:
N/A
Other Category:
N/A
Year:
2008
