Table 3.

Population studies investigating the prevention and treatment of prostate cancer using green and black tea.

Location	Type of Study	Daily Dose	Odds Ratio	Reference
Green tea, Japan	Cohort Study, advanced CaP N=49,920, cases=404	≥ 5 cups, protective	0.6 (p=0.01)	Kurahashi N et al. 2008 [22]
Black tea, Hawaii	Cohort of men of Japanese decent n=7833, cases=149 >58 yrs	Once per day, > 10 years, protective	0.6 (p=0.04)	Heilbrun LK et al. 1986 [23]
Green tea, Japan	Cohort Study, n=19561, cases=110	≥5 cups, no association	0.85 (P=0.81)	Kikuchi N et al. 2006 [28]
Green tea, Japan	Cohort Study N=18115, cases=196	No association	P=0.16	Allen NE et al. 2004 [30]
Green tea and black tea, USA (Hawaii)	Cohort Study n=7999, cases=174 Japanese ancestry	No association	GT ever vs never 1.47 BT ever vs never 0.83	Severson et al. 1989 [29]
Tea, Canada	Cohort Study, n=3400, cases=145	>500 mL, No association	1.02	Ellison et al. 2000 [105]
Tea, UK (London)	Prospective Cohort n=14085, cases=185	>10 compared to <4, no association	0.8 (p=0.3)	Kinlen LJ et al. 1988 [106]
Green tea, China	Case control cases=130, controls=274	Protective effect	0.28	Jian L et al. 2004 [24]
Green and black tea, Japan	Case control cases=140, controls=140	≥10 cups protective trend, not significant	GT 0.67 (p=0.3) BT 1.5	Sonoda T et al. 2004 [25]
Tea, Canada	Case control cases=617, controls=637	>500 ml, protective	0.7 (p=0.05)	Jain MG et al. 1998 [31]
Tea, Italy	Case control cases=107, Controls=6147	>1 cup no association	0.9	LaVecchia C et al. 1992 [26]
Tea, Canada	Case Control Study (cases=1623, controls=1623)	> 4 cups/day, No association		Villeneuve et al. 1999 [27]