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        Item #
        Length
        Source of Standard
        Year Implemented
        Version Implemented
        Year Retired
        Version Retired
        Column #
    
    
        1782
        8
        NAACCR
        2015
        15
        
        
        2965 - 2972
    



NAACCR XML: Tumor.survDateActiveFollowup




Description
The Surv-Date Active Followup is defined as the earlier of the Date of Last Contact [1750] and a study cutoff date. The study cut-off date is a pre-determined date based on the year of data submission and is set in the survival program used to derive the seven survival variables. If the Date of Last Contact [1750] is earlier than the study cut-off date and either the day or month is unknown or not available, the values are imputed by the survival program. The survival program is available from your standard setter or NAACCR.
    

Example 1 
Date of Last Contact: 20111120 

    Study Cut-off Date: 20111231
    
    Surv-Date Active Followup: 20111120
    
Note: The date of last contact is earlier than the study cut-off date, and the date of last contact is complete, so the date of last contact is used in Surv-Date Active Followup.
    

Example 2 
Date of Last Contact: 201111
Study Cut-off Date: 20111231 
Surv-Date Active Followup: 20111115
    
Note: Rationale is to take mid-point of possible values. For Nov (30 days) it would be FLOOR((1+30)/2) = 15, where FLOOR is a function that rounds a decimal down to an integer.

Rationale
The Surv-Date Active Followup is needed to be able to recalculate survival months if a different study cut-off date is used and provides flexibility to recalculate survival without needing to rerun the survival program on the original data.
Additional information about the survival algorithm and what specific values are assigned in given missing date situations are available here:


    http://seer.cancer.gov/survivaltime/.

Codes
If Date of Last Contact [1750] is blank, Surv-Date Active Followup will also be blank.