The literature data on the association of the SNP c.836 A > G (rs17576) MMP9 with BC are as follows: multidirectional data (protection/risk effects of SNP) are shown by Resler et al. [19] on the one hand (the BC protective effect of the G allele in obese women was also registered in our study) and by Chahil et al. [17] and Oliveira et al. [18]; on the other hand, in two experimental works [55,59] and in three meta-analyses [8,57,58] reliable connections of c.836 A > G (rs17576) MMP9 with BC were not found. Here, MMP9 is linked to breast cancer.