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SEER Inquiry System - Report
Produced: 09/20/2026 3:59 PM
Question 20091042
Inquiry Details
References:
#1: Sngl vs Sbsq Prim Lymph & Hem. 02/28/2001
#2: 2007 SEER Manual, 9
Question:
Discussion:
Example: Patient had a diagnosis on February 2003, plasmacytoma of the sinus; June 2003, plasmacytoma of the alveolar ridge; July 2003, plasmacytoma of the skin; and June 2004, multiple myeloma.
If this represents a transformation of plasmacytomas to multiple myeloma, will the information on multiple myeloma be available for statistical and research purposes?
Answer:
For cases diagnosed prior to 1/1/2010:Accession this case as plasmacytoma diagnosed in Feb. 2003. Each of the subsequent diagnoses are not abstracted as new primaries. They are the "same," one primary only, according to the Definition of Single and Subsequent Primaries for Hematologic Malignancies (the tri-fold heme table).
The 2003 diagnosis is a classic example of extraosseous plasmacytoma (9734/3).
Plasmacytoma and multiple myeloma would be two primaries in the new hematopoietic rules taking effect in 2010.
For cases diagnosed 1/1/10 and later, refer to the Hematopoietic and Lymphoid Neoplasm Case Reportability and Coding Manual and the Hematopoietic Database (Hematopoietic DB) provided by SEER on its website to research your question. If those resources do not adequately address your issue, submit a new question to SINQ.
