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SEER Inquiry System - Report
Produced: 10/24/2025 9:25 AM
Question 20140038
Inquiry Details
References:
2007 MP/H Rules
Question:
MP/H Rules/Multiple Primaries--Urinary: How many primaries are there and which MP rules apply in this scenario? See discussion.
Discussion:
Patient has 2 tumors in the left ureter; one is transitional cell (8120) and one is papillary transitional cell (8130). Rule M6 says BLADDER tumors with any combination of the following histologies ... are a single primary. But this is not a bladder case. Rule M8 says urothelial tumors in 2 or more of the following sites are a single primary... but this is not in 2 or more sites. Rule M9 then says histologies different at the 1st, 2nd, or 3rd digit are separate primaries. That makes this 2 primaries, but I do not think this should be 2 primaries.
Answer:
Rule M9 applies. Abstract 2 primaries.
We will evaluate this scenario for the next version of the multiple primary rules.
