Human papillomavirus infection and risk of breast cancer: a meta-analysis of case-control studies

Table 1 Summary of the selected case-control studies by subtypes of human papillomavirus*

First author	Year of publication	Reference number	Nation	Tissue type*	Any type		16 Subtype		18 Subtype		33 Subtype
First author	Year of publication	Reference number	Nation	Tissue type*	Case (n/N)	Control (n/N)	Case (n/N)	Control (n/N)	Case (n/N)	Control (n/N)	Case (n/N)	Control (n/N)
Yu	1999	22	China/Japan	PET	18/52	1/20					18/52	1/20
Damin	2004	23	Brazil	PET	25/101	0/41	14/101	0/41	10/101	0/41
de Villiers	2005	24	USA	PET	25/29	20/29
Gumus	2006	25	Turkey	FFT	37/50	16/50			20.37	9/16	35/37	14/16
Choi	2007	10	Korea	PET	8/123	0/31
Tsai	2007	20	China	FFT	8/62	2/32
Khan	2008	26	Japan	PET	26/124	0/11	24/124	0/11	3/124	0/11	1/124	0/11
de Leon	2009	27	Mexico	PET	15/51	0/43	10/51	0/43	3/51	0/43
Mendiazabauiz	2009	29	Mexico	PET	3/67	0/40
Herrera-Goepfert	2011	41	Mexico	PET	6/60	7/60	6/60	7/60
Mou	2011	30	China	FFT	4/62	0/46	3/62	0/46	1/62	0/46
Chang	2012	31	China	FFT	0/48	3/30
Frega	2012	32	Italy	PET	9/31	0/12
Glenn	2012	33	Australia	FFT	25/50	8/40			25/50	8/40
Sigaroodi	2012	34	Iran	PET	15/58	1/41	4/79	0/51	4/79	0/51
Liang	2013	35	China	FFT	48/224	6/37
Ali	2014	36	Iraq	PET	60/129	3/44	33/129	0/44	35/129	1/44	16/129	1/44
Ahangar-Oskouee	2014	37	Iran	PET	22/65	0/65	1/65	0/65
Manzouri	2014	38	Iran	PET	10/55	7/51	2/55	0/51	1/55	0/51	1/55	0/51
Peng	2014	39	China	FFT	2/100	0/50			2/100	0/50
Fu	2015	40	China	PET	25/169	1/83
Li	2015	14	China	PET	3/187	0/92
He	2009	28	China	FFT			24/40	1/20
Heng	2009	21	Australia	PET			1/26	0/17

*(n/N) number of positive on the tested samples, FFT fresh frozen tissue, PET paraffin-embedded tissue

ISSN: 1750-9378