TP53 Arg72Pro polymorphism is associated with esophageal cancer risk: A meta-analysis

Table 1 Main characteristics of included studies in the meta-analysis

First author (yr)	Country	Ethnicity	Source of controls	Specimens	Sample size (case/control)
Lee[20] (2000)	China (Taiwan)	Asian	Hospital	White blood cells	90/254
Peixoto[21] (2001)	China	Asian	Population	Exfoliated esophageal cells	32/57
Hamajima[22] (2002)	Japan	Asian	Hospital	White blood cells	102/241
Li[23] (2002)	China	Asian	Population/blood donors	Tumor tissue	62/131
Hu[24] (2003)	China	Asian	Population	White blood cells	120/130
Vos[25] (2003)	South Africa	African	Unknown	Tumor tissue, White blood cells	73/115
Hong[26] (2005)	China	Asian	Population	Normal Esophageal tissue	758/1420
Cai[27] (2006)	China	Asian	Population	White blood cells	204/389
Shao[28] (2008)	China	Asian	Population	White blood cells	673/694