MMP1 and breast cancer: The distribution of allelic frequencies of MMP1–1607 1G and 2G alleles were found to be 0.42 and 0.58 in controls, compared with 0.27 and 0.73 in patients respectively, thus an increased frequency of 2G-allele of MMP1 (OR 2.01, 95%CI 1.57–2.59, p<0.001) was observed in BC subjects (p<0.01) as summarized in Table 4.