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SEER Inquiry System - Report
Produced: 12/28/2025 7:07 AM
Question 20081109
Inquiry Details
References:
2007 SEER Manual, C-691. Appendix C
Question:
MP/H Rules--Breast: Patient has 2 existing primaries, both of left breast and both were pure lobular carcinoma, one was diagnosed in 1994 and the other in 2005. Now a biopsy in 2008 of a supraclavicular lymph node (laterality unknown) and subcutaneous scalp tissue show metastatic DUCTAL carcinoma. Per path report, breast is the primary site. Slides from prior tumors were not reviewed. Should this be made a new primary or assumed to be metastasis from the prior breast tumors? See Discussion.
Discussion:
A modified radical mastectomy was performed on 10/6/94.
The 2007 MP/H rules tell us that multiple ductal and lobular tumors of breast are a single primary; however, the rules do not apply to metastatic tumors.
Answer:
For cases diagnosed 2007 or later:
Abstract the 2008 diagnosis as a new primary.
Since the primary site is unproven but stated to be breast, and since the laterality is unknown, we cannot determine that the 2008 diagnosis is the same as the 2005 or the 1994 diagnosis.
Revise this case accordingly if more information becomes available.
