MMP9 and breast cancer: The distribution of allelic frequencies of MMP9–1562 C and T alleles were found to be 0.67 and 0.33 in controls, compared with 0.58 and 0.42 in patients respectively, with an increased frequency of T-allele of MMP9 (OR 1.44, 95% CI 1.14–1.83, p<0.0023) was observed in BC patients as summarized in Table 4.