In accordance with the HaploReg public epigenetic data (https://pubs.broadinstitute.org/mammals/haploreg/haploreg.php, accessed on 18 June 2022), we predicted a meaningful function of 10 BC-related polymorphic loci of MMP genes and the vast majority of strongly linked polymorphisms (121 loci out of 124 SNPs, 97.58%) in relation to 10 genes located next to them such as MMP9, SLC12A5, MMP8, RP11-465L10.7, MMP3, RP11-465L10.10, MMP2, LOC100288077, MMP1, and ZNF335 (Supplementary Table S4). This evidence concerns the gene MMP9 and breast cancer.