In a Polish study of 270 breast cancer cases and 300 controls, Przybylowska et al. found increased levels of MMP9 in tumor samples compared to normal breast tissue and an increased risk of breast cancer associated with the T allele for rs3918242 in MMP9 (OR 2.6, 95% CI 1.3–4.9) [48]. The gene discussed is MMP9; the disease is breast carcinoma.