Table 1.

Selected SEER attributes and their respective descriptors. AJCC: American Joint Committee on Cancer.

Number	Attribute	Description	Type
1	Age	Age at time of diagnosis.	Discrete
2	Grade	Appearance of cancer cells and how fast they may grow.	Numeric
3	Radiation Sequence with Surgery	Order of surgery and radiation therapy administered for patients who received both.	Numeric
4	Number of Primaries	Number of malignant tumors other than lung.	Discrete
5	T	AJCC component describing tumor size.	Numeric
6	N	AJCC component describing lymph node involvement.	Numeric
7	M	AJCC component describing tumor dissemination to other organs.	Numeric
8	Radiation	Indication of whether patient has received radiation.	Numeric
9	Stage	Stage of tumor - based on T, N, and M.	Numeric
10	Primary Site	Location of tumor within the lungs.	Numeric
11	First Malignant Primary Indicator	Based on cancers reported in SEER database for patient.	Numeric
12	Sequence Number	Order of lung cancer occurrence with respect to other cancers for this patient.	Discrete
13	CS Lymphnodes	Number of lymph nodes involved.	Numeric
14	Histology Recode - Broad Groupings	Microscopic composition of cells and/or tissues for specific primary. Used for staging and treatment determination.	Numeric
15	RXSumm -- ScopeRegLNSur(2003 +)	(Scope of Regional Lymph Node Surgery) -- Procedure of removal, biopsy, or aspiration of regional lymph nodes.	Numeric
16	RXSumm -- SurgPrimSite(1998+)	(Surgery of Primary Site) -- Procedure to remove or destroy tissue of the primary site.	Numeric
17	DerivedSS1977	This item is derived “SEER Summary Stage 1977” from the Collaborative Stage (CS) algorithm, effective with 2004+ diagnosis.	Numeric
18	TumorSize	Measurement of tumor size.	Numeric
19	Survival Time	Number of months that patient is alive from date of diagnosis.	Discrete