Previous studies have highlighted the role of S. salivarius strains as new potential probiotics; metabolites produced by these organisms protected mouse fibroblasts against oxidative stress, exhibited antimicrobial activity, and had an antiproliferative effect on liver and breast cancer [37] or inhibited the activation of the NF-kB pathway in HT-29 cells [38]. Here, NFKB1 is linked to breast cancer.