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SEER Inquiry System - Report
Produced: 06/16/2026 1:45 PM
Question 20100009
Inquiry Details
References:
2007 SEER Manual, C-806, C-830. Appendix C
Question:
MP/H Rules/Multiple primaries--Bladder: Is a new primary accessioned for a 2009 diagnosis of transitional cell carcinoma of the bladder when the patient has a history of invasive bladder cancer NOS diagnosed? See Discussion.
Discussion:
A patient has a history of invasive bladder cancer diagnosed several years ago in another state. In 2009, the patient was admitted and found to have a positive biopsy for transitional cell carcinoma of the bladder.
Is this a new primary because the histology of the previous bladder cancer is unknown? When the histology of a previously diagnosed bladder cancer is unknown, should we assume the previous tumor was urothelial carcinoma?
Answer:
For cases diagnosed 2007 or later, apply rule M6. The 2009 diagnosis is not a new primary. Transitional cell carcinomas account for more than 90% of bladder cancers. If the patient actually had a rare small cell, squamous cell, or adenocarcinoma of the bladder in the past, it is highly likely it would be mentioned in the medical record.
Cancer Site Category:
Bladder
Data Item Category:
N/A
Other Category:
Multiple primaries
Year:
2010
