The search included all studies published until May 2024 and used the following keywords, alone or in combination: cancer, cancer diseases, curcumin, EGCG, genistein, quercetin, resveratrol, polyphenols, polyphenolic compounds, chemoprevention, MMP-2, MMP-9, gelatinases, type IV collagenases. Here, MMP9 is linked to cancer.