Despite conflicting results, considerable evidence suggests the association between single nucleotide polymorphisms in MTHFR, XRCC1 and OGG1 genes and, risk of developing breast cancer. Here a case-control study is reported, including 135 breat cancer patients and 112 healthy women, all representative of Northern Sardinian population. | MTHFR XRCC1 and OGG1 genetic polymorphisms in breast cancer A casecontrol study in a population from North Sardinia