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SEER Inquiry System - Report
Produced: 10/20/2025 12:16 PM
Question 20091050
Inquiry Details
References:
2007 SEER Manual, 92
Question:
Date of Multiple Tumors--Breast: How is this field coded when a second breast tumor is found at mastectomy two months after the original breast cancer was diagnosed, but during initial workup and treatment? See Discussion.
Discussion:
Breast cancer was diagnosed on core biopsy on 02-27-07. It was not known that the breast was harboring 2 tumors until mastectomy was done on 4-01-07. Both tumors are counted as one primary.
Answer:
Code "Date of Multiple Tumors" field to the date of the mastectomy. That is the date that multiple tumors were discovered.
Cancer Site Category:
Breast
Data Item Category:
N/A
Other Category:
N/A
Year:
2009
