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

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

First author Year of publication Reference number Nation Tissue type* Any type 16 Subtype 18 Subtype 33 Subtype
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     
  1. *(n/N) number of positive on the tested samples, FFT fresh frozen tissue, PET paraffin-embedded tissue