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        Alternate Name
        Item #
        Length
        Source of Standard
        Implemented Year
        Implemented Version
        Retired Year
        Retired Version
        Column #
    
    
        Derived Summary Stage 2017

        762
        1
        SEER
        2016
        16
        
        
        894 - 894
    


Description
These two new items are needed to store the results of a 2017 version of Summary Stage (SS) based on a computer algorithm, Derived SEER SS2017 [762], and to allow for the direct assignment of this variable, Directly Assigned SEER SS2017 [764].
Rationale
The SEER program has collected staging information on cases since its inception in 1973. For many cancer sites, the different versions of AJCC stage over time have made the analyses of long term trends in stage very difficult. Therefore, for long-term staging trends, SEER has relied on a more simplified summary stage. When Collaborative Stage (CS) information is no longer available, SEER will need to derive summary stage via computer algorithm based on T, N, or M (clinical, pathologic, Derived SEER combined) or SEER Primary Tumor, SEER Regional Nodes, and SEER Mets and other information as needed. The SEER Derived SS2017 criteria may be applied to earlier CS and EOD data for cases prior to 2017. The SEER Directly Assigned SS2017 data item is provided for those wishing to collect summary stage but who aren’t collecting all of the fields needed by the computer algorithm to derive SS2017.
Codes

    
        
            0
            In situ
        
        
            1
            Localized
        
        
            2
            Regional, direct extension only
        
        
            3
            Regional, regional lymph nodes only
        
        
            4
            Regional, direct extension and regional lymph nodes
        
        
            5
            Regional, NOS
        
        
            7
            Distant
        
        
            8
            Not applicable
        
        
            9
            Unstaged

0	In situ
1	Localized
2	Regional, direct extension only
3	Regional, regional lymph nodes only
4	Regional, direct extension and regional lymph nodes
5	Regional, NOS
7	Distant
8	Not applicable
9	Unstaged