Table 5.

List of studies that did not detect HPV DNA sequences in breast cancer tissues

S. No	Study report	Sample size	Total HPV positivity n (%)	HPV16 n (%)	HPV18 n (%)	HPV16/18 n (%)	Other HPV types n (%)	Country
1	Wrede et al., 1992	92	0	0	0	0	0	UK
2	Bratthauer et al., 1992	43	0	0	0	0	0	USA*
3.	Gopalkrishna et al., 1996	30	0	0	0	0	0	India
4.	Czerwenka et al., 1996	20	0	0	0	0	0	Austria*
5.	Lindel et al., 2007	81	0	0	0	0	0	Switzerland
6.	de Cremoux et al., 2008	50	0	0	0	0	0	France
7.	Hedau et al. (Present study)	252*	0	0	0	0	0	India

* Country with both positive and negative results.