. 2015 Jul 21;3(3):71–74. doi: 10.1016/j.prnil.2014.09.001

Table 1.

Characteristics of four studies included in the present meta-analysis.^a)

Author	Origin of population	Age (yr)	N	Stage	PSA (ng/mL)	Cut off	Sampling	Method	Survival analysis	Hazard ratios	Follow-up (mo)
Qing et al²⁶ 2010	China	71.6	106	T1-T4	–	ΔCt method	tumor	qRT-PCR	DFS	Reported	82
Kang et al²⁷ 2012	Korea	64.7	73	T2a-T3b	7.5	ΔCt method	tumor	qRT-PCR	DFS	Reported	19.4
Avgeris et al²⁸ 2013	Greece	65	62	T2a-T3b	–	45th percentile	tumor	qRT-PCR	DFS	Reported	75
Schaefer et al²⁵ 2009	USA	63	76	T2a-T3b	6.7	Median	tumor	qRT-PCR	DFS	Reported	50

DFS, disease-free survival; –, not mentioned; PSA, prostate specific antigen; qRT-PCR, quantitative real-time PCR.

^a)

The studies included here are all retrospective cohort studies with different groups of patients.