Table 5. Ethnic differences of SNP (c.309 T>G) in the MDM2 gene among lung cancer cases.

Ethnicity	Country	Sample size	T/T (%)	T/G (%)	G/G (%)	Allele frequency (309 G)	Reference
African-American	USA	133	110 (83.3)	20 (15.2)	2 (1.5)	9.1%	[36]
Caucasian	USA	1787	702 (39.3)	802 (44.9)	283 (15.8)	38.3%	[35]
Caucasian	USA	1026	419 (40.8)	472 (46.2)	135 (13.2)	36.2%	[34]
Caucasian	Norway	341	130 (38.1)	156 (45.7)	55 (45.7)	39.0%	[37]
Caucasian	USA	371	150 (40.4)	167 (45.0)	54 (14.6)	37.1%	[36]
Asian	China	717	166 (52.0)	373 (52.0)	178 (24.8)	50.8%	[36]
Asian	China	1106	249 (22.5)	561 (50.7)	296 (26.8)	52.1%	[38]
Asian	Korea	582	113 (19.4)	280 (48.1)	189 (32.5)	56.5%	[39]
Asian	Japan	377	68 (18.0)	183 (48.5)	126 (33.4)	57.7%	[30] *
Asian	Japan	383	82 (21.4)	170 (44.4)	131 (34.2)	56.4%	This study

^*Squamous cell carcinoma.