Table 1.

Demographic and Disease Characteristics of Patients Age 20 Years and Older with a Diagnosis of Malignant First Primary Lung Cancer in SEER-13 from 1992 to 2007

	All Patients		Development of a Second Lung Primary
			No		Yes
Characteristic	n	%	n	%	n	%	p Value
Total	156,494		151,872		4622
Sex							<0.0001
Male	83,971	53.7%	81,653	53.8%	2318	50.2%
Female	72,523	46.3%	70,219	46.2%	2304	49.8%
Race							<0.0001
White	125,762	80.4%	121,921	80.3%	3841	83.1%
Black	17,392	11.1%	16,911	11.1%	481	10.4%
Other	13,340	8.5%	13,040	8.6%	300	6.5%
Age at diagnosis, y							<0.0001
20-49	11,890	7.6%	11,645	7.7%	245	5.3%
50-59	28,866	18.4%	27,908	18.4%	958	20.7%
60-69	48,762	31.2%	46,842	30.8%	1920	41.5%
≥70	66,976	42.8%	65,477	43.1%	1499	32.4%
Histologic type							<0.0001
Squamous cell	32,326	20.7%	31,061	20.5%	1265	27.4%
SCLC	18,585	11.9%	18,356	12.1%	229	5.0%
Adenocarcinoma	58,031	37.1%	55,696	36.7%	2335	50.5%
Other NSCLC	47,552	30.4%	46,759	30.8%	793	17.2%
SEER stage							<0.0001
Local	36,414	23.3%	33,853	22.3%	2561	55.4%
Regional	49,568	31.7%	47,965	31.6%	1603	34.7%
Distant	59,239	37.9%	58,904	38.8%	335	7.2%
Unstaged	11,273	7.2%	11,150	7.3%	123	2.7%

SEER, Surveillance, Epidemiology, and End Results.