- control ▁study ▁of ▁Texas ▁women ▁established ▁an ▁association ▁between ▁B L V ▁presence ▁in ▁breast ▁t issue ▁and ▁breast ▁cancer ▁status ▁with ▁an ▁odd ▁ratio ▁OR ▁ 5 . 1 . ▁ ▁Another ▁case - control ▁study ▁conducted ▁on ▁Chinese ▁patients ▁did ▁not ▁find ▁any ▁association ▁between ▁B L V ▁and ▁breast ▁cancer . ▁However ▁this ▁study ▁did ▁not ▁look ▁t issue ▁samples ▁from ▁breast ▁cancer , ▁only ▁blood ▁work . ▁A ▁subsequent ▁evaluation ▁of ▁the ▁Chinese ▁study ▁pointed ▁out ▁weak ness es ▁in ▁method ology ▁used , ▁e . g . ▁a ▁veter inary ▁test ▁k it ▁designed ▁and ▁cal ibr ated ▁for ▁cattle ▁in app ropri ately ▁used ▁to ▁test ▁for ▁human ▁ant ib od ies , ▁despite ▁warnings ▁against ▁this ▁in ▁k it ▁instructions . ▁An ▁exhaust ive ▁analysis ▁of ▁ 5 1 ▁whole ▁genom es ▁of ▁breast ▁can cers ▁did ▁not ▁show ▁any ▁trace ▁of ▁B L V ▁DNA ▁and ▁thus ▁ex cludes ▁cl onal ▁insert ion ▁( integration ▁into ▁human ▁genom ic ▁DNA ) ▁of ▁B L V ▁in ▁breast ▁tum or ▁cells . ▁However , ▁this ▁search ▁for ▁B L V ▁in ▁breast ▁tum or ▁cells ▁did ▁not ▁target ▁un integr ated ▁B L V ▁DNA ▁that ▁could ▁be ▁associated ▁with ▁breast ▁cancer . ▁ ▁Another ▁study ▁in ▁California ▁of ▁ 9 5 ▁women ▁found ▁that ▁more ▁than ▁a ▁third ▁had ▁evidence ▁of ▁in fection ▁in ▁their ▁blood , ▁a ▁third ▁had ▁ant ib od ies , ▁but ▁that ▁these ▁were ▁not ▁correl ated . ▁